A single full-grown specimen of the larva of this species was found under a log in a wood near London on the 11th of June. Length one inch. Head black and shining.

Body above brownish black, closely covered with tufts of moderately long stiff hairs, proceeding from elevated shining tubercles. Hairs and tubercles a little darker than the surface of body, excepting along the sides, where, although the tubercles continue the same, the hairs are changed to a yellowish-brown color.

Under surface brown, with a slight greenish tint; fifth, sixth, eleventh, and twelfth segments are each belted with a series of tufts of short yellowish-brown hairs, in continuation of those above. Feet black and shining. Prolegs yellowish-brown and hairy.