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THE MOTHER DECIDES THE SEX OF THE EGG




I will begin with the Mason-bee of the Pebbles. (This is the same
insect as the Mason-bee of the Walls. Cf. "The Mason-bees": passim.--
Translator's Note.) The old nests are often used, when they are in
good enough repair. Early in the season the mothers quarrel fiercely
over them; and, when one of the Bees has taken possession of the
coveted dome, she drives any stranger away from it. The old house is
far from being a ruin, only it is perforated with as many holes as it
once had occupants. The work of restoration is no great matter. The
heap of earth due to the destruction of the lid by the outgoing
tenant is taken out of the cell and flung away at a distance, atom by
atom. The remnants of the cocoon are also thrown away, but not
always, for the delicate silken wrapper sometimes adheres closely to
the masonry.

The victualling of the renovated cell is now begun. Next comes the
laying; and lastly the orifice is sealed with a mortar plug. A second
cell is utilized in the same way, followed by a third and so on, one
after the other, as long as any remain unoccupied and the mother's
ovaries are not exhausted. Finally, the dome receives, mainly over
the apertures already plugged, a coat of plaster which makes the nest
look like new. If she has not finished her laying, the mother goes in
search of other old nests to complete it. Perhaps she does not decide
to found a new establishment except when she can find no second-hand
dwellings, which mean a great economy of time and labour. In short,
among the countless number of nests which I have collected, I find
many more ancient than recent ones.

How shall we distinguish one from the other? The outward aspect tells
you nothing, owing to the great care taken by the Mason to restore
the surface of the old dwelling equal to new. To resist the rigours
of the winter, this surface must be impregnable. The mother knows
that and therefore repairs the dome. Inside, it is another matter:
the old nest stands revealed at once. There are cells whose
provisions, at least a year old, are intact, but dried up or musty,
because the egg has never developed. There are others containing a
dead larva, reduced by time to a blackened, curled-up cylinder. There
are some whence the perfect insect was never able to issue: the
Chalicodoma wore herself out in trying to pierce the ceiling of her
chamber; her strength failed her and she perished in the attempt.
Others again and very many are occupied by ravagers, Leucopses (Cf.
"The Mason-bees": chapter 11.--Translator's Note.) and Anthrax-flies,
who will come out a good deal later, in July. Altogether, the house
is far from having every room vacant; there are nearly always a
considerable number occupied either by parasites that were still in
the egg-stage at the time when the Mason-bee was at work or by
damaged provisions, dried grubs or Chalicodomae in the perfect state
who have died without being able to effect their deliverance.

Should all the rooms be available, a rare occurrence, there still
remains a method of distinguishing between an ancient nest and a
recent one. The cocoon, as I have said, adheres pretty closely to the
walls; and the mother does not always take away this remnant, either
because she is unable to do so, or because she considers the removal
unnecessary. Thus the base of the new cocoon is set in the bottom of
the old cocoon. This double wrapper points very clearly to two
generations, two separate years. I have even found as many as three
cocoons fitting one into another at their bases. Consequently, the
nests of the Mason-bee of the Pebbles are able to do duty for three
years, if not more. Eventually they become utter ruins, abandoned to
the Spiders and to various smaller Bees or Wasps, who take up their
quarters in the crumbling rooms.

As we see, an old nest is hardly ever capable of containing the
Mason-bee's entire laying, which calls for some fifteen apartments.
The number of rooms at her disposal is most unequal, but always very
small. It is saying much when there are enough to receive about half
the laying. Four or five cells, sometimes two or even one: that is
what the Mason usually finds in a nest that is not her own work. This
large reduction is explained when we remember the numerous parasites
that live upon the unfortunate Bee.

Now, how are the sexes distributed in those layings which are
necessarily broken up between one old nest and another? They are
distributed in such a way as utterly to upset the idea of an
invariable succession first of females and then of males, the idea
which occurs to us on examining the new nests. If this rule were a
constant one, we should be bound to find in the old domes at one time
only females, at another only males, according as the laying was at
its first or at its second stage. The simultaneous presence of the
two sexes would then correspond with the transition period between
one stage and the next and should be very unusual. On the contrary,
it is very common; and, however few cells there may be, we always
find both females and males in the old nests, on the sole condition
that the compartments have the regulation holding-capacity, a large
capacity for the females, a lesser for the males, as we have seen.

The old male cells can be recognized by their position on the outer
edges and by their capacity, measuring on an average the same as a
column of sand 31 millimetres high in a glass tube 5 millimetres
wide. (1.21 x .195 inches.--Translator's Note.) These cells contain
males of the second or third generation and none but males. In the
old female cells, those in the middle, whose capacity is measured by
a similar column of sand 45 millimetres high (1.75 inches.--
Translator's Note.), are females and none but females.

This presence of both sexes at a time, even when there are but two
cells free, one spacious and the other small, proves in the plainest
fashion that the regular distribution observed in the complete nests
of recent production is here replaced by an irregular distribution,
harmonizing with the number and holding-capacity of the chambers to
be stocked. The Mason-bee has before her, let me suppose, only five
vacant cells: two larger and three smaller. The total space at her
disposal would do for about a third of the laying. Well, in the two
large cells, she puts females; in the three small cells, she puts
males.

As we find the same sort of thing in all the old nests, we must needs
admit that the mother knows the sex of the egg which she is going to
lay, because that egg is placed in a cell of the proper capacity. We
can go further and admit that the mother alters the order of
succession of the sexes at her pleasure, because her layings, between
one old nest and another, are broken up into small groups of males
and females according to the exigencies of space in the actual nest
which she happens to be occupying.

Just now, in the new nest, we saw the Mason-bee arranging her total
laying into series first of females and next of males; and here she
is, mistress of an old nest of which she has not the power to alter
the arrangement, breaking up her laying into sections comprising both
sexes just as required by the conditions imposed upon her. She
therefore decides the sex of the egg at will, for, without this
prerogative, she could not, in the chambers of the nest which she
owes to chance, deposit unerringly the sex for which those chambers
were originally built; and this happens however small the number of
chambers to be filled.

When the nest is new, I think I see a reason why the Mason-bee should
seriate her laying into females and then males. Her nest is a half-
sphere. That of the Mason-bee of the Shrubs is very nearly a sphere.
Of all shapes, the spherical shape is the strongest. Now these two
nests require an exceptional power of resistance. Without protection
of any kind, they have to brave the weather, one on its pebble, the
other on its bough. Their spherical configuration is therefore very
practical.

The nest of the Mason-bee of the Walls consists of a cluster of
upright cells backing against one another. For the whole to take a
spherical form, the height of the chambers must diminish from the
centre of the dome to the circumference. Their elevation is the sine
of the meridian arc starting from the plane of the pebble. Therefore,
if they are to have any solidity, there must be large cells in the
middle and small cells at the edges. And, as the work begins with the
central chambers and ends with those on the circumference, the laying
of the females, destined for the large cells, must precede that of
the males, destined for the small cells. So the females come first
and the males at the finish.

This is all very well when the mother herself founds the dwelling,
when she lays the first rows of bricks. But, when she is in the
presence of an old nest, of which she is quite unable to alter the
general arrangement, how is she to make use of the few vacant rooms,
the large and the small alike, if the sex of the egg be already
irrevocably fixed? She can only do so by abandoning the arrangement
in two consecutive rows and accommodating her laying to the varied
exigencies of the home. Either she finds it impossible to make an
economical use of the old nest, a theory refuted by the evidence, or
else she determines at will the sex of the egg which she is about to
lay.

The Osmiae themselves will furnish the most conclusive evidence on
the latter point. We have seen that these Bees are not generally
miners, who themselves dig out the foundation of their cells. They
make use of the old structures of others, or else of natural
retreats, such as hollow stems, the spirals of empty shells and
various hiding-places in walls, clay or wood. Their work is confined
to repairs to the house, such as partitions and covers. There are
plenty of these retreats; and the insect would always find first-
class ones if it thought of going any distance to look for them. But
the Osmia is a stay-at-home: she returns to her birth-place and
clings to it with a patience extremely difficult to exhaust. It is
here, in this little familiar corner, that she prefers to settle her
progeny. But then the apartments are few in number and of all shapes
and sizes. There are long and short ones, spacious ones and narrow.
Short of expatriating herself, a Spartan course, she has to use them
all, from first to last, for she has no choice. Guided by these
considerations, I embarked on the experiments which I will now
describe.

I have said how my study, on two separate occasions, became a
populous hive, in which the Three-horned Osmia built her nests in the
various appliances which I had prepared for her. Among these
appliances, tubes, either of glass or reed, predominated. There were
tubes of all lengths and widths. In the long tubes, entire or almost
entire layings, with a series of females followed by a series of
males, were deposited. As I have already referred to this result, I
will not discuss it again. The short tubes were sufficiently varied
in length to lodge one or other portion of the total laying. Basing
my calculations on the respective lengths of the cocoons of the two
sexes, on the thickness of the partitions and the final lid, I
shortened some of these to the exact dimensions required for two
cocoons only, of different sexes.

Well, these short tubes, whether of glass or reed, were seized upon
as eagerly as the long tubes. Moreover, they yielded this splendid
result: their contents, only a part of the total laying, always began
with female and ended with male cocoons. This order was invariable;
what varied was the number of cells in the long tubes and the
proportion between the two sorts of cocoons, sometimes males
predominating and sometimes females.

The experiment is of paramount importance; and it will perhaps make
the result clearer if I quote one instance from among a multitude of
similar cases. I give the preference to this particular instance
because of the rather exceptional fertility of the laying. An Osmia
marked on the thorax is watched, day by day, from the commencement to
the end of her work. From the 1st to the 10th of May, she occupies a
glass tube in which she lodges seven females followed by a male,
which ends the series. From the 10th to the 17th of May, she
colonizes a second tube, in which she lodges first three females and
then three males. From the 17th to the 25th of May, a third tube,
with three females and then two males. On the 26th of May, a fourth
tube, which she abandons, probably because of its excessive width,
after laying one female in it. Lastly, from the 26th to the 30th of
May, a fifth tube, which she colonizes with two females and three
males. Total: twenty-five Osmiae, including seventeen females and
eight males. And it will not be superfluous to observe that these
unfinished series do not in any way correspond with periods separated
by intervals of rest. The laying is continuous, in so far as the
variable condition of the atmosphere allows. As soon as one tube is
full and closed, another is occupied by the Osmia without delay.

The tubes reduced to the exact length of two cells fulfilled my
expectation in the great majority of cases: the lower cell was
occupied by a female and the upper by a male. There were a few
exceptions. More discerning than I in her estimate of what was
strictly necessary, better-versed in the economy of space, the Osmia
had found a way of lodging two females where I had only seen room for
one female and a male.

This experiment speaks volumes. When confronted with tubes too small
to receive all her family, she is in the same plight as the Mason-bee
in the presence of an old nest. She thereupon acts exactly as the
Chalicodoma does. She breaks up her laying, divides it into series as
short as the room at her disposal demands; and each series begins
with females and ends with males. This breaking up, on the one hand,
into sections in all of which both sexes are represented and the
division, on the other hand, of the entire laying into just two
groups, one female, the other male, when the length of the tube
permits, surely provide us with ample evidence of the insect's power
to regulate the sex of the egg according to the exigencies of space.

And besides the exigencies of space one might perhaps venture to add
those connected with the earlier development of the males. These
burst their cocoons a couple of weeks or more before the females;
they are the first who hasten to the sweets of the almond-tree. In
order to release themselves and emerge into the glad sunlight without
disturbing the string of cocoons wherein their sisters are still
sleeping, they must occupy the upper end of the row; and this, no
doubt, is the reason that makes the Osmia end each of her broken
layings with males. Being next to the door, these impatient ones will
leave the home without upsetting the shells that are slower in
hatching.

I experimented on Latreille's Osmia, using short and even very short
stumps of reed. All that I had to do was to lay them just beside the
nests of the Mason-bee of the Sheds, nests beloved by this particular
Osmia. Old, disused hurdles supplied me with reeds inhabited from end
to end by the Horned Osmia. In both cases I obtained the same results
and the same conclusions as with the Three-horned Osmia.

I return to the latter, nidifying under my eyes in some old nests of
the Mason-bee of the Walls, which I had placed within her reach,
mixed up with the tubes. Outside my study, I had never yet seen the
Three-horned Osmia adopt that domicile. This may be due to the fact
that these nests are isolated one by one in the fields; and the
Osmia, who loves to feel herself surrounded by her kin and to work in
plenty of company, refuses them because of this isolation. But on my
table, finding them close to the tubes in which the others are
working, she adopts them without hesitation.

The chambers presented by those old nests are more or less spacious
according to the thickness of the coat of mortar which the
Chalicodoma has laid over the assembled chambers. To leave her cell,
the Mason-bee has to perforate not only the plug, the lid built at
the mouth of the cell, but also the thick plaster wherewith the dome
is strengthened at the end of the work. The perforation results in a
vestibule which gives access to the chamber itself. It is this
vestibule which is sometimes longer and sometimes shorter, whereas
the corresponding chamber is of almost constant dimensions, in the
case of the same sex, of course.

We will first consider the short vestibule, at the most large enough
to receive the plug with which the Osmia will close up the lodging.
There is then nothing at her disposal except the cell proper, a
spacious apartment in which one of the Osmia's females will find
ample accommodation, for she is much smaller than the original
occupant of the chamber, no matter the sex; but there is not room for
two cocoons at a time, especially in view of the space taken up by
the intervening partition. Well, in those large, well-built chambers,
formerly the homes of Chalicodomae, the Osmia settles females and
none but females.

Let us now consider the long vestibule. Here, a partition is
constructed, encroaching slightly on the cell proper, and the
residence is divided into two unequal storeys, a large room below,
housing a female, and a narrow cabin above, containing a male.

When the length of the vestibule permits, allowing for the space
required by the outer stopper, a third storey is built, smaller than
the second; and another male is lodged in this cramped corner. In
this way the old nest of the Mason-bee of the Pebbles is colonized,
cell after cell, by a single mother.

The Osmia, as we see, is very frugal of the lodging that has fallen
to her share; she makes the best possible use of it, giving to the
females the spacious chambers of the Mason-bee and to the males the
narrow vestibules, subdivided into storeys when this is feasible.
Economy of space is the chief consideration, since her stay-at-home
tastes do not allow her to indulge in distant quests. She has to
employ the site which chance places at her disposal just as it is,
now for a male and now for a female. Here we see displayed, more
clearly than ever, her power of deciding the sex of the egg, in order
to adapt it judiciously to the conditions of the house-room
available.

I had offered at the same time to the Osmiae in my study some old
nests of the Mason-bee of the Shrubs, which are clay spheroids with
cylindrical cavities in them. These cavities are formed, as in the
old nests of the Mason-bee of the Pebbles, of the cell properly so-
called and of the exit-way which the perfect insect cut through the
outer coating at the time of its deliverance. Their diameter is about
seven millimetres (.273 inch.--Translator's Note.); their depth at
the centre of the heap is 23 millimetres (.897 inch.--Translator's
Note.); and at the edge averages 14 millimetres (.546 inch.--
Translator's Note.)

The deep central cells receive only the females of the Osmia;
sometimes even the two sexes together, with a partition in the
middle, the female occupying the lower and the male the upper storey.
True, in such cases economy of space is strained to the utmost, the
apartments provided by the Mason-bee of the Shrubs being very small
as it is, despite their entrance-halls. Lastly, the deeper cavities
on the circumference are allotted to females and the shallower to
males.

I will add that a single mother peoples each nest and also that she
proceeds from cell to cell without troubling to ascertain the depth.
She goes from the centre to the edges, from the edges to the centre,
from a deep cavity to a shallow cavity and vice versa, which she
would not do if the sexes were to follow upon each other in a settled
order. For greater certainty, I numbered the cells of one nest as
each of them was closed. On opening them later, I was able to see
that the sexes were not subjected to a chronological arrangement.
Females were succeeded by males and these by females without its
being possible for me to make out any regular sequence. Only--and
this is the essential point--the deep cavities were allotted to the
females and the shallow ones to the males.

We know that the Three-horned Osmia prefers to haunt the habitations
of the Bees who nidify in populous colonies, such as the Mason-bee of
the Sheds and the Hairy-footed Anthophora. Exercising the very
greatest care, I broke up some great lumps of earth removed from the
banks inhabited by the Anthophora and sent to me from Carpentras by
my dear friend and pupil M. Devillario. I examined them
conscientiously in the quiet of my study. I found the Osmia's cocoons
arranged in short series, in very irregular passages, the original
work of which is due to the Anthophora. Touched up afterwards, made
larger or smaller, lengthened or shortened, intersected with a
network of crossings by the numerous generations that had succeeded
one another in the same city, they formed an inextricable labyrinth.

Sometimes these corridors did not communicate with any adjoining
apartment; sometimes they gave access to the spacious chamber of the
Anthophora, which could be recognized, in spite of its age, by its
oval shape and its coating of glazed stucco. In the latter case, the
bottom cell, which once constituted, by itself, the chamber of the
Anthophora, was always occupied by a female Osmia. Beyond it, in the
narrow corridor, a male was lodged, not seldom two, or even three. Of
course, clay partitions, the work of the Osmia, separated the
different inhabitants, each of whom had his own storey, his own
closed cell.

When the accommodation consisted of no more than a simple cylinder,
with no state-bedroom at the end of it--a bedroom always reserved for
a female--the contents varied with the diameter of the cylinder. The
series, of which the longest were series of four, included, with a
wider diameter, first one or two females, then one or two males. It
also happened, though rarely, that the series was reversed, that is
to say, it began with males and ended with females. Lastly, there
were a good many isolated cocoons, of one sex or the other. When the
cocoon was alone and occupied the Anthophora's cell, it invariably
belonged to a female.

I have observed the same thing in the nests of the Mason-bee of the
Sheds, but not so easily. The series are shorter here, because the
Mason-bee does not bore galleries but builds cell upon cell. The work
of the whole swarm thus forms a stratum of cells that grows thicker
from year to year. The corridors occupied by the Osmia are the holes
which the Mason-bee dug in order to reach daylight from the deep
layers. In these short series, both sexes are usually present; and,
if the Mason-bee's chamber is at the end of the passage, it is
inhabited by a female Osmia.

We come back to what the short tubes and the old nests of the Mason-
bee of the Pebbles have already taught us. The Osmia who, in tubes of
sufficient length, divides her whole laying into a continuous
sequence of females and a continuous sequence of males, now breaks it
up into short series in which both sexes are present. She adapts her
sectional layings to the exigencies of a chance lodging; she always
places a female in the sumptuous chamber which the Mason-bee or the
Anthophora occupied originally.

Facts even more striking are supplied by the old nests of the Masked
Anthophora (A. personata, ILLIG.), old nests which I have seen
utilized by the Horned Osmia and the Three-horned Osmia at the same
time. Less frequently, the same nests serve for Latreille's Osmia.
Let us first describe the Masked Anthophora's nests.

In a steep bank of sandy clay, we find a set of round, wide-open
holes. There are generally only a few of them, each about half an
inch in diameter. They are the entrance-doors leading to the
Anthophora's abode, doors always left open, even after the building
is finished. Each of them gives access to a short passage, sometimes
straight, sometimes winding, nearly horizontal, polished with minute
care and varnished with a sort of white glaze. It looks as if it had
received a thin coat of whitewash. On the inner surface of this
passage, in the thickness of the earthy bank, spacious oval niches
have been excavated, communicating with the corridor by means of a
narrow bottle-neck, which is closed, when the work is done, with a
substantial mortar stopper. The Anthophora polishes the outside of
this stopper so well, smooths its surface so perfectly, bringing it
to the same level as that of the passage, is so careful to give it
the white tint of the rest of the wall that, when the job is
finished, it becomes absolutely impossible to distinguish the
entrance-door corresponding with each cell.

The cell is an oval cavity dug in the earthy mass. The wall has the
same polish, the same chalky whiteness as the general passage. But
the Anthophora does not limit herself to digging oval niches: to make
her work more solid, she pours over the walls of the chamber a
salivary liquid which not only whitens and varnishes but also
penetrates to a depth of some millimetres into the sandy earth, which
it turns into a hard cement. A similar precaution is taken with the
passage; and therefore the whole is a solid piece of work capable of
remaining in excellent condition for years.

Moreover, thanks to the wall hardened by the salivary fluid, the
structure can be removed from its matrix by chipping it carefully
away. We thus obtain, at least in fragments, a serpentine tube from
which hangs a single or double row of oval nodules that look like
large grapes drawn out lengthwise. Each of these nodules is a cell,
the entrance to which, carefully hidden, opens into the tube or
passage. When she wishes to leave her cell, in the spring, the
Anthophora destroys the mortar disk that closes the jar and thus
reaches the general corridor, which is quite open to the outer air.
The abandoned nest provides a series of pear-shaped cavities, of
which the distended part is the old cell and the contracted part the
exit-neck, rid of its stopper.

These pear-shaped hollows form splendid lodgings, impregnable
strongholds, in which the Osmiae find a safe and commodious retreat
for their families. The Horned Osmia and the Three-horned Osmia
establish themselves there at the same time. Although it is a little
too large for her, Latrielle's Osmia also appears very well satisfied
with it.

I have examined some forty of the superb cells utilized by each of
the first two. The great majority are divided into two storeys by
means of a transversal partition. The lower storey includes the
larger portion of the Anthophora's cell; the upper storey includes
the rest of the cell and a little of the bottle-neck that surmounts
it. The two-roomed dwelling is closed, in the passage, by a
shapeless, bulky mass of dried mud. What a clumsy artist the Osmia
is, compared with the Anthophora! Against the exquisite work of the
Anthophora, partition and plug strike a note as hideously incongruous
as a lump of dirt on polished marble.

The two apartments thus obtained are of a very unequal capacity,
which at once strikes the observer. I measured them with my five-
millimetre tube. On an average, the bottom one is represented by a
column of sand 50 millimetres deep (1.95 inches.--Translator's Note.)
and the top one by a column of 15 millimetres (.585 inch.--
Translator's Note.). The holding-capacity of the one is therefore
about three times as large as that of the other. The cocoons enclosed
present the same disparity. The bottom one is big, the top one small.
Lastly, the lower one belongs to a female Osmia and the upper to a
male Osmia.

Occasionally the length of the bottle-neck allows of a fresh
arrangement and the cavity is divided into three storeys. The bottom
one, which is always the most spacious, contains a female; the two
above, both smaller than the first and one smaller than the other,
contain males.

Let us keep to the first case, which is always the most frequent. The
Osmia is in the presence of one of these pear-shaped hollows. It is a
find that must be employed to the best advantage: a prize of this
sort is rare and falls only to fortune's favourites. To lodge two
females in it at once is impossible; there is not sufficient room. To
lodge two males in it would be undue generosity to a sex that is
entitled to but the smallest consideration. Besides, the two sexes
must be represented in almost equal numbers. The Osmia decides upon
one female, whose portion shall be the better room, the lower one,
which is larger, better-protected and more nicely polished, and one
male, whose portion shall be the upper storey, a cramped attic,
uneven and rugged in the part which encroaches on the bottle-neck.
This decision is proved by numerous undeniable facts. Both Osmiae
therefore can choose the sex of the egg about to be laid, seeing that
they are now breaking up the laying into groups of two, a female and
a male, as required by the conditions of the lodging.

I have only once found Latreille's Osmia established in the nest of
the Masked Anthophora. She had occupied but a small number of cells,
because the others were not free, being inhabited by the Anthophora.
The cells in question were divided into three storeys by partitions
of green mortar; the lower storey was occupied by a female, the two
others by males, with smaller cocoons.

I came to an even more remarkable example. Two Anthidia of my
district, A. septemdentatum, LATR., and A. bellicosum, LEP., adopt as
the home of their offspring the empty shells of different snails:
Helix aspersa, H. algira, H. nemoralis, H. caespitum. The first-
named, the Common Snail, is the most often used, under the stone-
heaps and in the crevices of old walls. Both Anthidia colonize only
the second whorl of the spiral. The central part is too small and
remains unoccupied. Even so with the front whorl, the largest, which
is left completely empty, so much so that, on looking through the
opening, it is impossible to tell whether the shell does or does not
contain the Bee's nest. We have to break this last whorl if we would
perceive the curious nest tucked away in the spiral.

We then find first a transversal partition, formed of tiny bits of
gravel cemented by a putty made from resin, which is collected in
fresh drops from the oxycedrus and the Aleppo pine. Beyond this is a
stout barricade made up of rubbish of all kinds: bits of gravel,
scraps of earth, juniper-needles, the catkins of the conifers, small
shells, dried excretions of Snails. Next come a partition of pure
resin, a large cocoon in a roomy chamber, a second partition of pure
resin and, lastly, a smaller cocoon in a narrow chamber. The
inequality of the two cells is the necessary consequence of the shape
of the shell, whose inner space gains rapidly in width as the spiral
gets nearer to the orifice. Thus, by the mere general arrangement of
the home and without any work on the Bee's part beyond some slender
partitions, a large room is marked out in front and a much smaller
room at the back.

By a very remarkable exception, which I have mentioned casually
elsewhere, the males of the genus Anthidium are generally larger than
the females; and this is the case with the two species in particular
that divide the Snail's spiral with resin partitions. I collected
some dozens of nests of both species. In at least half the cases, the
two sexes were present together; the female, the smaller, occupied
the front cell and the male, the bigger, the back cell. Other cells,
which were smaller or too much obstructed at the back by the dried-up
remains of the Mollusc, contained only one cell, occupied at one time
by a female and at another by a male. A few, lastly, had both cells
inhabited now by two males and now by two females. The most frequent
arrangement was the simultaneous presence of both sexes, with the
female in front and the male behind. The Anthidia who make resin-
dough and live in Snail-shells can therefore alternate the sexes
regularly to meet the exigencies of the spiral dwelling-house.

One more thing and I have done. My apparatus of reeds, fixed against
the walls of the garden, supplied me with a remarkable nest of the
Horned Osmia. The nest is established in a bit of reed 11 millimetres
wide inside. (.429 inch--Translator's Note.) It comprises thirteen
cells and occupies only half the cylinder, although the orifice is
plugged with the usual stopper. The laying therefore seems here to be
complete.

Well, this laying is arranged in a most singular fashion. There is
first, at a suitable distance from the bottom or the node of the
reed, a transversal partition, perpendicular to the axis of the tube.
This marks off a cell of unusual size, in which a female is lodged.
After that, in view of the excessive width of the tunnel, which is
too great for a series in single file, the Osmia appears to alter her
mind. She therefore builds a partition perpendicular to the
transversal partition which she has just constructed and thus divides
the second storey into two rooms, a larger room, in which she lodges
a female, and a smaller, in which she lodges a male. She next builds
a second transversal partition and a second longitudinal partition
perpendicular to it. These once more give two unequal chambers,
stocked likewise, the large one with a female, the smaller one with a
male.

>From this third storey onwards, the Osmia abandons geometrical
accuracy; the architect seems to be a little out in her reckoning.
The transversal partitions become more and more slanting and the work
grows irregular, but always with a sprinkling of large chambers for
the females and small chambers for the males. Three females and two
males are housed in this way, the sexes alternating.

By the time that the base of the eleventh cell is reached, the
transversal partition is once more almost perpendicular to the axis.
Here what happened at the bottom is repeated. There is no
longitudinal partition; and the spacious cell, covering the whole
diameter of the cylinder, receives a female. The edifice ends with
two transversal partitions and one longitudinal partition, which mark
out, on the same level, chambers twelve and thirteen, both of which
contain males.

There is nothing more curious than this mixing of the two sexes, when
we know with what precision the Osmia separates them in a linear
series, where the narrow width of the cylinder demands that the cells
shall be set singly, one above the other. Here, the Bee is making use
of a tube whose diameter is not suited to her work; she is
constructing a complex and difficult edifice, which perhaps would not
possess the necessary solidity if the ceilings were too broad. The
Osmia therefore supports these ceilings with longitudinal partitions;
and the unequal chambers resulting from the introduction of these
partitions receive females at one time and males at another,
according to their capacity.





Next: PERMUTATIONS OF SEX

Previous: THE DISTRIBUTION OF THE SEXES



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