Erynnis afranius, also known as the afranius duskywing or bald duskywing, is a species of 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 25âÂÂ31 mm. There can be two generations from mid-May to late August.
The larvae feed on Lupinus species, Lotus species and Thermopsis rhombifolia.