Will the larva, now that it possesses a modicum of strength, force
itself imprudently into this heap? Far from it. The victuals are
consumed in due order, from the bottommost to the topmost. The larva
drags towards it, to a little distance, into the dining-room, the first
ring that offers, devours it without danger of being inconvenienced by
the others and thus, layer by layer, consumes the batch of two dozen,
always in complete security.
Let us retrace our steps and end with a brief summary. The large number
of grubs provided for a single cell and their very incomplete paralysis
jeopardize the security of the Wasp’s egg and of her new-born larva.
How is the danger to be averted? This is the problem; and it has
several solutions. The Eumenes, with her sheath, which enables the
larva to climb back to the ceiling, gives us one; the Odynerus, in her
turn, gives us hers, a solution no less ingenious and much more
complicated.
The egg and also the newly-hatched larva have to be saved from the
danger of contact with the game. A suspension-thread solves the
difficulty. Up to this point, that is the method adopted by the
Eumenes; but soon the young larva, having eaten its first grub, drops
off the thread that gave it a support whereby to shrink out of harm’s
way. A sequence of conditions now begins, all directed towards its
welfare.
Prudence demands that the very young larva shall first attack the most
inoffensive of the grubs, that is those most nearly deadened by
abstinence, in short, the grubs first placed in the cell; it demands,
moreover, that the consumption of these grubs shall proceed from the
oldest specimens to the most recent, so that the larva may have fresh
game to the end. With this object, a curious exception is made to the
general rule: the egg is laid before the victualling is commenced. It
is laid at the back of the cell; in this way, the stacked provisions
will present themselves to the larva in due order of date.
That is not enough: it is important that the grubs shall be unable, in
moving, to alter their respective positions. This circumstance is
provided for: the store-room is a narrow cylinder in which change of
place is difficult.
Even that is not sufficient: the larva must have room enough to move
about at ease. The condition is fulfilled: at the back, the cell forms
a comparatively spacious dining-room:
Is that all? Not yet. The dining-room must not be encumbered like the
rest of the cell. The matter has been seen to: the first course
consists of a small number of specimens.
Have we done? By no means. It is not of any use to have a narrow
cylinder for the larder: if the grubs straighten out, they will slip
lengthwise and disturb the nurseling in the back-room. This has been
remedied: the game selected is a larva which deliberately rolls itself
into a bracelet and maintains its position by its own tendency to
unbend.
Public-domain text, read in full here on John Shaqi.
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