194 Journal New York Entomological Society. [Vol. 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 anterior 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 wiih 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 19; April 20th, 1 9 and 1 $ \ April 21st, 

 1 9 ; April 22d, 2 9 and 1 $ ; April 23d, 2 £ ; April 24th, 2 9 ; 

 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 of 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 

 blaek 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. Antennas 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 forewiDgs close to the fringe of the external border. 



Food- plants. — Populus balsamifera, var. candicans, one of the 

 Western Cotton woods, 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 



