Studies on Life-history of Bombycine Moths. 67 



as the others. On each abdominal segment (1-8) is a pair of 

 dorsal short, slender black pencils crossing each other, and arising 

 from the forward pair of tubercles; there being none on the thoracic 

 segments. All the legs, thoracic and abdominal, are black. As late 

 as July 18th many were molting into this stage, having spun a 

 carpet of silk on which to rest, and in which to fix their crochets 

 during the process of exuviation. 



Stage IV. — Length 18-20 mm. The body is now much larger 

 and thicker than before, but the arrangement of the hairs and their 

 color are as before, and the tubercles are of the same dark tint. 



Full-fed larva, stage V. — Described September 25th. Length 

 35-38 mm. The head is entirely jet-black. The body is of a deli- 

 cate pale bluish-white, with the sutures in front broadly painted with 

 black, with irregular black spots and lines between the tubercles, 

 which a4-e also black. The bod}^ is entirely concealed from above 

 b}^ the very dense hairs, while on the sides the verticils are not so 

 dense and the body appears through them. On the back the hairs 

 are dense and evenly trimmed, while on the sides they are quite 

 uneven. The hairs are in general snow-white, those on the sides 

 spreading out widely, as in the other species. On the 1st abdomi- 

 nal segment is a pair of high, slender, lateral black pencils; and 

 another pair slightly shorter on the 7th segment. Along the back 

 is a series of 8 double wedge-shaped black median dorsal tufts, on 

 each side of which and between which on each side is a subdorsal 

 row of transverse linear black marks, forming the center of trans- 

 versely elongated tubercles, the hairs radiating obliquely so as to 

 leave the top of the tubercles exposed. On the sides is a series of 

 round black tubercles, with several irregular black spots scattered 

 below; still below which is a series of smaller lateral black tuber- 

 cles giving rise to white hairs. A few black hairs on top of the 

 thoracic segments and more dorsal black ones arise from the end 

 of the body, some of them forming two slight pencils, each con- 

 sisting of about 9 or 10 black uneven hairs. 



The life-history of Halesidota maculata (Harris). 



I found the young larvae from stage II to the full-grown larvse 

 feeding on poplar at Brunswick, Maine Those in stage II occurred 

 on the under side of the leaf, August 5-7. 



Stage II. — Length 7 mm. The head is black, nearly as wide as 

 the body, which is straw-yellow, with a black prothoracic shield, 



