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 
segments have numerous slender pencils of pale yellow hairs, much longer than the 
general clothing of the body, in this respect resembling the larva of H. tessellaris but 
differing from that of H. edwardsii, 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 on 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. 
11. The willow tussock moth. 
Orgyia definita Packard. 
Order Lepidoptera; family Bombycidce. 
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 larvce 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. 
First 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-grown larva.— Length from 2 to 2.5 centimeters. Ground color whitish-green, 
head whitish-yellow with two black spots. A deep black dorsal band, on 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 on 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 
