This genus may be distinguished by the tufts of raised scales on the anterior wings. The antennae are more than half as long as the wings, simple, inserted just above the eyes. Head and face smooth, with appressed scales. Face rather broad. Tongue very short. No maxillary palpi; labial palpi curving around the sides of the head upwards, the tips approaching each other on the vertex, the third joint shorter than the second, which is laterally compressed and slightly clavate.

In November, 1867, I received from my esteemed friend, the late B. Billings, of Ottawa, several specimens of the larva of that very rare arctian, A. parthenos, which he had reared from eggs laid by a captured female in a box. They were apparently about two-thirds grown, and ready to hybernate for the winter ; a common practice with many species belonging to this interesting family of moths.

The length of this larva was l¼ inches, body cylindrical.

Head medium sized, bilobed, black and shining, with a few brownish hairs.

[145] 194. Campylus Denticornis, Kirby. – Length of body 6 lines. Taken in Canada by Dr. Bigsby.

This is the American representative of C. mesomelas, from which it is sufficiently distinguished by its toothed antennae and longer prothorax. Body linear, black, hairy with pale decumbent hairs. Head punctured ; antennae longer than the prothorax, filiform, with all the joints, except the scape, pedicel, and terminal one, terminating at their internal extremity in a prominent tooth, less conspicuous in the two lower ones ; upper-lip, and nose which is reflexed and overhangs the mouth, yellow : prothorax channelled, punctured, quadrangular, with the anterior angles rounded, and the posterior diverging and terminating in a sharp tooth or prominence ; sides rather wavy ; limb yellow : scutellum subcordate : elytra minutely and thickly punctured, slightly furrowed, furrows thickly punctured; marked with a narrow yellow, stripe which does not reach the apex ; there is also a short yellow streak on the shoulders : base of the tibiae, claw-point of the tarsi, and claws, yellow. [“Lake Superior, Maine and Pennsylvania” (Le Conte). We have specimens taken in the neighborhood of Ottawa, Ont.]