each of the three segments of the thorax there are two long hairs,
fixed to the lower surface; and there are two similar and still
longer hairs at the end of the terminal ring. These four pairs of
bristles, three in front and one behind, are the locomotory organs,
to which we must add the hairy edge of the head and also the anal
button, a sustaining base which might very well work with the aid
of a certain stickiness, as happens with the primary larva of the
Sitaris [a Parasitic Beetle noted for the multiplicity of
transformations undergone by the grub]. We see, through the
transparent skin, two long air tubes running parallel to each other
from the first thoracic segment to the last abdominal segment but
one. They ought to end in two pairs of breathing holes which I
have not succeeded in distinguishing quite plainly. Those two big
respiratory vessels are characteristic of the grubs of flies.
Their mouths correspond exactly with the points at which the two
sets of stigmata open in the Anthrax larva in its second form.

For a fortnight, the feeble grub remains in the condition which I
have described, without growing and very probably also without
nourishment. Assiduous though my visits be, I never perceive it
taking any refreshment. Besides, what would it eat? In the cocoon
invaded there is nothing but the larva of the mason bee; and the
worm cannot make use of this before acquiring the sucker that comes
with the second form. Nevertheless, this life of abstinence is not
a life of idleness. The animalcule explores its dish, now here,
now elsewhere; it runs all over it with looper strides; it pries
into the neighborhood by lifting and shaking its head.

I see a need for this long wait under a transitory form that
requires no feeding. The egg is laid by the mother on the surface