On July 5th, 1884, several larvæ of this species were handed me by a neighbor, who had found them feeding on Asclepias quadrifolia gorwing in the yard. They were just ready to pass the last moult, evidently leaving the plant for the purpose of moulting; some of them being found on a fence attracted the notice of the person finding them. As found they were .55 of an inch long; body brownish balck, each joint with eight tubercles from which project tufts of hairs. Those from the four dorsal, on joints 2 and 3, are long and black, part of those on joint 4 are white; the posterior three joints also supporting long tufts. The dorsal tufts between these are ochre colored, about a third as long as the anterior or posterior, and bend towards the centre from each side. the lower tufts on the anterior part of the body are gray, the rest balck. Head black.