LEPIDOPTERA. 171 
joints, and inserted in a fixed labium, which forms the paries 
of the portion of the buccal cavity, inferior to the proboscis. 
Two little and scarcely distinct, corneous, and more or less 
-ciliated pieces, situated, one on each side, on the anterior 
and superior margin of the front of the head, near the eyes, 
seem to be vestiges of mandibles. Finally, we observe, and 
in equally exiguous proportions, the labrum or upper lip. 
The antenne vary and are always multiarticulated. Two 
ocelli are observable in several species, but concealed between 
the scales(1). The three segments of which the trunk of the 
hexapoda is composed, are united in one single body; the first 
is very short, and the two others are confounded together. 
The scutellum is triangular, but the apex is directed towards 
the head. ‘The wings are simply veined, and vary in size, 
figure and position; in several, the inferior ones are plaited 
longitudinally near their inner margin. At the base of each 
of the superior wings is a kind of epaulette, prolonged pos- 
teriorly, that corresponds to the piece called ¢egu/a in the 
Hymenoptera. As it is more developed here, I will call it 
pterygoda. The abdomen, composed of from six to seven 
annuli, is attached to the thorax by a very small portion of 
its diameter,. and presents neither sting nor ovipositor analo- 
- logous to that of the Hymenoptera. In several females, 
however, as in Cossus, the last rings become narrowed, and 
extended to form an oviduct resembling a pointed and retrac- 
tile tail. ‘The tarsi always have five joints. There are never 
more than two kinds of individuals, males and females. The 
abdomen of the former is terminated by a kind of flat foreeps 
which contains the penis. 
The females usually deposit their ova, frequently very nu- 
merous, on the vegetable surfaces which are to nourish their 
larve, and soon after perish. 
The larve of Lepidopterous Insects are well known by the 
name of caterpillars. ‘They have six squamous or hooked 
(1) According to an observation made by Dalman, they do not exist in the 
Diurne. 
