Length of body four lines; expanse of wings eight to nine lines.

Head white, eyes black, labial palpi recurved; first joint large and white; lower half of second joint white; upper brown, with white tip; antennæ filiform ringed light brown and black.

Cinerous varied with fuscous; apex of the front and basal angles of the scutellum black; pronotal rugæ distinct. Length 4½-5 mm.

Male.— Face with coarse rugose punctures, arranged in oblique lines on the base of the front; front black, cinereous at base and next the eyes, with a broad, curved, transverse white band, including th ocelli; clypeus, loræ and cheeks whitish, the former sometimes tinged with pale green. Form of teh pronotum about as in insignis; cinereous clouded with fuscous on the apex and along the posterior margin, with an elongated black spot behind the inner angle of the eye; rugæ composed of profound elongated puncutres.

I was pleased to see Mr. Cockerell's article on this subject in the September number of the Canadian Entomologist, and hope we may hear from others on the question. It seems to me that a genus should, as far as possible, represent a natural division of a group of plants or animals so distinct from other groups that the species forming the genus are easily referred to it.

Cerura cinereoides n. var. or n. sp. Head, collar and tegulæ light cinereous; thorax above largely mixed with orange and metallic blue scales, below somewhat paler cinereous; tarsi ringed with black; abdomen concolorous with the thorax, the segments banded behind with paler cinereous, the last segment in the female sprinkled with black scales, the anal tuft in the male nearly white.

Egg.—Cylindrical, ends rounded; .06 inch long by .04 inch in diameter, smooth. Colour chestnut-brown. Duration of this period about 195 days.

Young larva.—Length .15 inch; cylindrical, a little larger at anterior part; each joint with six tubercles from which arise spreading hairs, varying in length from short ones, that are not longer thant the diameter of the body to those that are as long as the body, the two kinds distributed over the whole body; the short ones white and long ones grey; the longest hairs at the anterior and posterior parts of the body a little longer than the long ones on the middle; colour grey, black. Duration of this period three days.

Orchestes niger and O. subhirtus are both found on willow when in bloom. (Harrington Can. Ent, 16, p. 119.)

Orchestes niger and O. pallicornis were taken together in July on the leaves of low willows by Mr. Chittenden. O. ephippiatus was found in abundance on willow (Salix fragilis) by Mr. C.W Leng and myself on Staten Island, N.Y.