Erynnis afranius, the Afranius duskywing or bald duskywing, is a butterfly of the family Hesperiidae. It is found from northern Mexico through the central United States to southern Canada in the provinces of Alberta, Saskatchewan and Manitoba. The wingspan is 25–31 mm. There can be two generations from mid-May to late August. The larvae feed on Lupinus species, Lotus species and Thermopsis rhombifolia.