194 
Journal New York Entomological Society. [Voi. vi. 
traces of a greenish tint as far down as costa of primaries. Abdominal segments a 
shiny, light brown almost chestnut. Posterior edge of three antericr segments heavily 
banded by darker brown, which is absent on the last two. A slight depression of 
the case on either side of thorax, between the wings and first adominal segment. 
Of twenty-four imagines emerged, I have the following record : 
April 14, 1898, one $ emerged from only cocoon of the first brood 
the parent representing the ordinary form of C. nivea. The emerged 
moth agreeing quite in every particular with this form. On same date 
emerged three $ of the second brood, bred from an almost immediate 
female. The progeny all took after the ordinary form of nivea as well 
as twenty others, which emerged in the following order: April 15th, 
2 9 ; April 18th, 2 $ and 1 9 ; April 20th, 1 9 and 1 $ \ April 21st, 
1 9 ; April 22d, 2 9 and 1 $ ; April 23d, 2 $ ; April 24th, 29 ; 
April 25th, 3 $ ; April 26th, 1 9 ; May 1st, 1 $. 
Six cocoons of the second brood I sent to Prof. Packard, and have 
not heard of result. Several went over to emerge in autumn, provided 
these do not perish. 
Imago —The pectination or antennae of the male, black. Entire body heavily 
clothed with long white hair. Head white, across the occiput a few black hairs ; on 
the dorsal part of thorax a transverse mark of black hairs, usually fringed posteriorly 
with yellow hairs. Abdomen white, forewings white, with a few yellow hairs near 
base of wing. A triangular, black mark across the middle of the cell. A row of 
black spots between the veins of external bolder. A similar row of black spots, 
across the wing near the end of cell. A few minute black spots near base of wing, 
between cell and inferior border. A few triangular black spots on costa. Hind- 
wings immaculate. Reverse side of wings immaculate. Antennae of female simple, 
black. In other respects, the head, thorax, abdomen and wings are ornamented the 
same as in the male. Legs white, feet blackish in both sexes. Sometimes the intra- 
venular spots are reproduced on reverse side of wings, and a black spot is noticeable 
in the cell of inferiors. In the whitest form of nivea, black spots occur only between 
the veins of the fore wings close to the fringe of the external border. 
Food-plants.—Populus balsamifera , var. candicans, one of the 
Western Cottonwoods, and Salix spec., a narrow-leaved willow. One 
larva near Flagstaff, found on Populus tremuloides , much resembling 
species herein described. 
Habits. —The young larva feeds on the tender parenchyma of 
upper side of leaf, thus exposing the skeleton of the blade. It spins a 
web, to which it clings. When five days old the larva feeds on the 
green pulp as well as fibrous part of the leaf, except midrib. It was 
supposed by some that the anal filamental organs or “tails,” were for 
the purpose of aiding in casting aside dung pellets. This is not the 
case As stated in a preceding paragraph, I noticed larva less than 
