Packard.] 
558 
[Feb. 19, 
2. On the other hand the prothoracic “horns” are larger in the 
earliest than in the latest stages. 
3. The head is smaller in proportion to the body than usual, ow- 
ing to the great width of the prothoracic segment. 
4. The body is all brown above in the first stage, beginning to 
turn green in the second, and in the third becoming nearly as in 
the last stage. Thus the colors are more diversified, with more 
green in the fourth and fifth stages, rendering the now more ex- 
posed larva more adapted for protection by the resemblance of its 
markings to the yellow and red spots on the green leaves of its 
food plant, which appear early in autumn. 
5. The dorsal hump on the third thoracic segment does not seem 
to appear until the last stage. 
6. The filamental legs retain their shape from the first to the last 
stage, but if anything are a little shorter in the last. On the other 
hand the spinules in the third stage become larger on the under 
side than before, the filaments being held curved up more than be- 
fore, so that the offensive spines on the under side in response to 
external stimuli have developed more rapidly than those on the up- 
per side. 
7. Novel structures are the very long and well developed supra- 
anal plate, and the pair of coproliferous spines (or dung-forks) 
arising from the paranal lobes, and available for tossing away the 
pellets of excrement. These seem to be peculiar to the genus. 
GROUPING OF NOTODONTIAN LARViE ACCORDING TO THEIR AFFINITIES 
AND ALSO THEIR ADAPTATION TO ARBOREAL LIFE. 
As is well known the larvae of this family vary greatty in form and 
ornamentation for a group of such moderate numbers ; and the fol- 
lowing synopsis has been prepared in order to show this great 
variety in as graphic a manner as possible. 
1. Body smooth, moderately hairy. Ichthyura , Datana. 
2. Very hairy, the body almost totally concealed. Apatelodes. 
3. Body smooth, hairless, with red and yellow spots. Glupliisia , 
Seirodonta. 
4. Body smooth, hairless ; with no humps or tubercles, of a noc- 
tuid shape ; anal legs never elevated ; color green, with yellow lines, 
the latter sometimes edged with reddish ; feeding less conspicuously 
than any others of the family. Nadata , Lophodonta. 
5. Body smooth, polished; a single hump, surmounted by a 
horn on the eighth abdominal segment. Pheosia. 
