rly complete instances that I have seen furnishes me with
the following data: the pseudochrysalis is very closely enveloped in
the skin of the secondary larva, a skin consisting of fine transparent
pellicle, without any rent whatever. This is the pouch of the Sitaris,
save that it lies in immediate contact with the body enclosed. On this
jacket we distinguish three pairs of tiny legs, reduced to short
vestiges, to stumps. The head is in place, showing quite perceptibly
the fine mandibles and the other parts of the mouth. There is no trace
of eyes. Each side has a white edging of shrivelled tracheae, running
from one stigmatic orifice to another.

Next comes the pseudochrysalis, horny, currant-red, cylindrical,
cone-shaped at both ends, slightly convex on the dorsal surface and
concave on the ventral surface. It is covered with delicate, prominent
spots, sprinkled very close together; it takes a lens to show them. It
is 1 centimetre long and 4 millimetres wide.[3] We can distinguish a
large knob of a head, on which the mouth is vaguely outlined; three
pairs of little shiny brown specks, which are the hardly perceptible
vestiges of the legs; and on each side a row of eight black specks,
which are the stigmatic orifices. The first speck stands by itself, in
front; the seven others, divided from the first by an empty space,
form a continuous row. Lastly, at the opposite end is a little pit,
the sign of the anal pore.

[Footnote 3: .393 x .156 inch.--_Translator's Note_.]

Of the six pseudochrysalids which a lucky accident placed at my
disposal, four were dead; the other two were furnished by _Zonitis
mutica_. This justified my forecast, which from the first, with
analogy for my guide, made me attribute these curious organizations to
the genus Zonitis. The meloidal parasite of the Osmiae, therefore, is
recognized. We have still to make the acquaintance of the primary
larva, which gets itself carried by the Osmia into the cell full of
honey, and the tertiary larva, the one which, at a given moment, must
be found contained in the pseudochrysalis, a larva which will be
succeeded by the nymph.

Let us recapitulate the strange metamorphoses which I have sketched.
Every Beetle-larva, before attaining the nymphal stage, undergoes a
greater or smaller number of moults, of changes of skin; but these
moults, which are intended to favour the development of the larva by
ridding it of covering that has become too tight for it, in no