On the 7th of June, while turning over some loose rails lying on a moist piece of ground, near the edge of a wood, I found attached to the underside of one of the rails, lying high and dry, two spincus larvæ, which, from their appearance and location, I at once suspected to be the larvae of some species of Argynnis. The wild Violet also, the food plant of at least several of this family, growing in abundance here, helped to confirm my suppositions.