LEPIDOPTERA. 3 
repose flat (a few Geometridae, e.g. Piniaria, Illustraria, Zebraria, etc., 
sleep with the wings erect); posterior wings generally furnished with a 
bristle, if it be wanting the form of the costa* is sufficient to distin- 
guish the insect from Rhopalocera ; the prothorax covered by a collar. 
Of the Heterocera there are nine groups, which are thus di- 
vided :— 
a. Antenne fusiform. . . . . . . . . JL. SPHINGINA. 
A a, Antenne sefaceous. 
B. Wings undivided. 
c. Wings with short cilia. 
p. Wings ample, the posterior gaily co- 
loured, or more so than the anterior 
wings. 
pn. Body thick, rather short, and poste- 
riorly obtuse; posterior legs hardly 
longer than the middle par . . 2. Bompycrna. 
» &. Body slender; posterior legs con- 
siderably longer than the middle 
PED Meese see > a, GOMES 
p pv. Wings moderate; the posterior of 
dingy colours. Body moderate, pos- 
teriorly attenuated . . . . . . 8. Nocruina. 
pp». Wings rather long, triangular. 
Body slender, elongate . . . . 5, PYRALIDINA. 
D DD D. Wings broad, the anterior sub- 
truncate; the costa at the base sud- 
denly convex . . . . . - « . 6, ToRTRICINA. 
cc. Wings with long or very long cilia. 
Wings elongate; body slender . . . 1%. TINBINA. 
B B. Wings divided. 
r. Anterior wings bifid; posterior trifid . 8. PreropHorINa. 
rr, Each wing divided into six. . . . 9. ALUCITINA. 
The first four of these groups, with the Ahopadocera, are fre- 
quently called Macro-Lepidoptera ; the remaining five being 
termed Micro-Lepidoptera: there is a certain convenience in 
these terms, as they will apply to the average size of the insects 
in the respective groups, for of course there are many exceptions 
of small species among the Macro-Lepidoptera, and large species 
among the Micro-Lepidoptera. 
* In the Rhopalocera the bristle appears absent, because prolonged into an entire 
nervure, which is in the membrane; in the Heterocera this membrane is wanting, 
wherefore the costal cell is narrow and the nervure abbreviated to a bristle. 
