||All., Balt., Dor., Gar., Montgomery, P.G., Wash. and Wo. Counties. Moderately common. May 16th to July 3rd and July 30th to August 26th. Occurs from Quebec to Maryland and westward almost to the Pacific. The larvae web leaves together to form conspicuous nests on various species of milkweed and dogbane, including Asclepsias tuberosa and Apocynum cannabinum. A series of adults were reared from larvae found on Indian Hemp, A. cannabinum, at Colesville, in September 1991, emerging in early June 1992 (DCF); and three older specimens in USNM were reared from milkweed.