POPLAR CATERPILLARS. 459 



30. Notodontian ? larva. 



This larva was observed on the aspeu, 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 pui>a 

 appearing about September 15. 



Larva. — Head large and broad, flattened in front, vertically; somewhat retractile 

 in the prothoracic segment. Body thicli, 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 trausverse 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""™. 



3L 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 C. californica 

 iior C. constricta, nor that of a si>ecies 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 C. erosa, C. 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' 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 

 a.ud 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 ou 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; uuder side bluish black ; legs black; tips of 

 prologs 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 behiud, with a triangular 



