124 STATES OF INSECTS. (Larva.) 
short, and consisting only ofa single joint. These max- 
illee of larvee were regarded by Reaumur and other 
writers as parts of the under-lip, on each side of which 
they are situated; and indeed, as well as those in the 
perfect insect, they form a part of the same machine, 
being connected by their base with the mentum, which 
is part of the labium, but they are clearly analogous to 
the maxillze of the imago. They are not to be found in 
the larvee of many Dipterous insects, and perhaps in 
some species belonging to other orders. In some Neu- 
ropterous larvee, as those of the Libellulina, the maxille 
are of a substance quite as solid and horny as the man- 
dibles, which in every respect they resemble: 
Under-lip (Lasium). Between the two maxillz in the 
Jarvee of most of the insects under consideration is a part 
termed by Reaumur the middle division of the under-lip, 
but which is in fact analogous to the whole of that organ 
in the zmago. ‘This organ varies in shape, being some- 
times quadrangular, often conical, &c. Interiorly it is 
frequently connected with a more fleshy protuberance, 
called the tongue by Reaumur’, and supplying the place 
of the ligula in the perfect insect. On each side of the 
apex of the under-lip is a minute feeler, and in the mid- 
dle between these in the Lepidoptera and many others, is 
a filiform organ, which I shall call the spinneret (Fusulus), 
through which the larva draws the silken thread em- 
ployed in fabricating its cocoon, preparatory to assuming 
the pupa state, and for other purposes °. This organ is 
2 Reaum. vi. ¢. xxxvii. f. 5. ee. > Ibid. i..125. 
© Pratr XXI. Fic. 9. The organ with which the larvae of Heme- 
robius, Myrmeleon, and Hydrophilus, spin their cocoons, is situated 
in the anus. The spinneret of the Cossus is figured by Lyonnet Ana- 
tom. t. li. f. 1, L, and 4g. 9 
