555 
[Packard. 
and narrow, well rounded, and tbe surface is provided with high 
papilliform piliferous warts. 
In this species the head and the prothoracic horns above and be- 
neath are reddish-brown, the latter in C. occidentalis being yellowish 
beneath, the two species by this mark being easil}' separated. 
The body is now more green on the sides, the green hue encroach- 
ing on the back and nearly meeting on the third thoracic segment. 
Only the fourth abdominal segment is wholly dark seen from above, 
and the green approximates high up on the sides of the sixth and 
seventh segments. 
Third stage. — Sept. 17. Length of body 19 and of stemapods 
12 mm. The body is now much thicker than before. The head 
is now smooth, with no traces of piliferous warts or of hairs rep- 
resenting them. The head is now larger in proportion to the body, 
and paler red, spotted with still paler patches. The prothoracic 
segment is still large and broad, but the lateral projections are 
much shorter, and now the tubercles of the preceding stages are 
represented by sunken pits from the bottom of which arise small 
hairs. The hairs on the body are minute, only being visible with 
a lens. The supra-anal plate is smooth, the papilliform tubercles 
much thicker and shorter in proportion than before, and the bristles 
arising from them slenderer and more flexible. The spinules on 
the stemapods are much slenderer and smaller than before, but it 
is to be noticed that by this time, they are larger on the under side , 
i. e., that side now almost constantly held up and thus more ex- 
posed to external stimuli, than those on the upper sides of the fil- 
aments. 
The colors of the body are nearly the same as in stage II, but the 
brown is tinged with lilac and reddish, with greenish patches on 
the upper side of the second to fifth abdominal segments. 
Fourth stage. — Sept. 16. Length of body 26, of stemapods 15- 
16 mm. The larva is still much paler in hue than before, with more 
decided lilac blotches on the back. The thoracic dorsal hump is 
now very marked, while the lateral projections of the prothoracic 
segment have nearly disappeared. The front edge of this segment 
is vermilion red. 
PARTIAL HISTORY OF CERURA OCCIDENTALIS LINTNER. 
This incomplete history is introduced in order to supplement 
the foregoing notes. The specimens occurred on the willow in 
Maine. 
