POPLAR CATERPILLARS. 459 
30. Notodoniian? larva. 
This larva was observed on the aspen, at Brunswick, Me., August 
10; it molted August 12, and on the 20th began to spin a slight silk 
cocoon between the leaves on the bottom of the breeding box. Withiu 
this web it remained for three or four weeks before pupating, the pupa 
appearing about September 15. 
Larva. — Head large and broad, flattened in front, vertically; somewhat retractile 
in the prothoracic segment. Body thick, soft, with numerous yellow conspicuous 
warts, six on each side of the prothoracic segment. Ou the second segment behind 
the head are two twin high coral-red tubercles which are yellow at the base. 
Body with three transverse yellow stripes, the two hinder ones nearer together than 
the first and second. Thoracic legs pea-green. Supra-anal plate broad and short, 
much rounded; anal legs with a transverse yellow. and blackish stripe. Length, 
20 mm . 
31. Clisiocampa calif ornica Pack. 
We have received the following account of a Clisiocampa larva 
found by Mr. H. W. Nash feeding on the aspen in Colorado. The 
larva did not wholly agree with the description of that of G. calif ornica 
nor G. constricta, nor that of a species we have found feeding on the 
wild rose in Montana, with specimens of which we have compared it, 
though the latter is undoubtedly G. californica. The following year 
Mr. Nash reared the moth and kindly sent me a specimen, which does 
not appear to belong to G. erosa, G. constricta, or G.fragilis, with speci- 
mens of which I have compared it. But in comparing the moths with 
specimens of G. californica both in Mr. H. Edwards 7 collection and my 
own, we both agree that it does not differ from G. californica from Cal- 
ifornia. The following letter dated Pueblo, Colo., February 28, 1883, 
describes its habits and appearance : 
I send by mail to-day a Clisiocampa with cocoon, as you request in Bulletin No. 7 
of the Entomological Commission, specimens and notes of insects injurious to forest 
and shade trees. 
At Rosita, Custer County, on the western slope of the Wet mountains, at an alti- 
tude of from 8,000 to 9,000 feet, during the month of June, 1881, the larvae almost 
entirely defoliated large tracts of poplars (P. tremuloides), and there was scarcely a 
tree to be found that was not attacked. I. saw a few feeding on willows where the 
leaves were all eaten from the poplars. The moths began appearing about the first 
of July and were soon fairly swarming about the poplars. 
The mature larvae were 2 inches long ; color, light blue spotted with dark brown; 
two brown stripes along the back; under side bluish black ; legs black; tips of 
prolegs light brown; body sparsely covered with long brown hairs. 
H. W. Nash. 
32. Thanaos sp. 
The caterpillar of this butterfly was beaten from the aspen at Bruns- 
wick, Me., August 20. A smaller one in a preceding stage occurred at 
the same date on the willow. It molted August 24. 
Larva. — Of the usual shape of the genus ; head broader than the short, small pro- 
thoracic segment ; angulated above, rather deeply bilobed ; surface rough, granulated ; 
brown in front ; black near the mouth and on the sides and behind, with a triangular 
