WILLOW CATERPILLARS. 561 



low. Body slightly depressed, densely clothed with evenly cut velvety black hairs, 

 except on the seventh and eighth segments which are bright lemon yellow, with a 

 small black dorsal lozenge-shaped patch of black on each. The caputal and anal 

 segraeuts have numerous slender pencils of pale yellow hairs, much longer than the 

 general clothing of the body, in this respect resembling the larva of R. tesaellaris but 

 diifering from that o( H. edtvardsii, where these pencils do not occur. 



Variety. — In some instances the black hairs are confined to the two anal and two 

 caputal segments, all the remainder of the body being yellow, with Mack dorsal 

 patches as in the type. 



10. Halesidota maculata (Harris). 



The eastern H. maculata occurred ou the willow at Brunswick, Me., 

 August 30. Some had four black pencils on the front of the body, in- 

 stead of two as Harris describes. 



n. The WILLOW TUSSOCK MOTH. 



Orgyia definita Packard. 

 Order Lepidoptera ; family Bombyddw. 



Mr. Otto Seifert has reared this moth, and kindly given me his notes, 

 which are presented below. The original specimen from which my de- 

 scription was drawn up was somewhat rubbed, hence the description is 

 imperfect. Mr. R. Thaxter has bred the insect and given me fresh 

 specimens, and I am also indebted to Mr. Seifert for two very well 

 preserved males and a female. 



Eggs found September 10 on willow, Catskills, Big Indian Valley. They are apple- 

 shaped, opaque, smooth, of cream color, glued together in a cluster about one-half 

 inch long and seven-tenths inch broad. Eggs commenced to hatch May 19. 



Young larvae are greenish, much laced (on account of developing protuberances), 

 head yellowish or pinkish white with a black, eye-like spot on each side, mouth-parts 

 light brown. 



^"■irst molt, May 26; second, May 31; third, June 2 and 3; fourth, June 8 ; fifth, 

 (?) ; transforming June 18. Imagines from July 1 to 8. 



They molt five times, are very voracious, and feed only on different species of willow 

 (fed in New York with weeping willow). 



Full-grotvn larva. — Length from 2 to 2.5 centimeters. Ground color whitish-green, 

 head whitish-yellow with two black spots. A deep black dorsal band, ou three first 

 segments only indicated by black spots, from fourth to eleventh segments uninter- 

 rupted. Legs and head hairy, the hair tufts are sulphur-yellow, arranged fan-like. 

 Two long black ornamented hair-brushes on first segment and a dense black tuft on 

 eleventh segment dorsally. 



Cocoon of the same delicate sulphur-yellow color, and is made of a large outer one 

 and a more dense inner one. 



Pupa light sulphur-yellow, retaining the eye-like black spots ou the head. This 

 insect shows wonderfully the development of the imago in the almost transparent 

 shell. 



There is in the middle of the black band on the dorsum of the ninth and tenth 

 segments each a yellowish white knob-like excrescence. 



The young larvae, when hatched, stay for a few days on the egg-shells, eating every 

 trace left of the glue and egg-shells, only leaving the web. 

 5 ENT 30 



