Wild indigo duskywing (Erynnis baptisiae) is a medium-sized spread-wing skipper. It is widespread, abundant, and increasing in the east and the Midwest, but rare in Minnesota.
Wild indigo duskywing was originally a species of open woodlands and shrubby prairies. The larvae fed on mostly on horseflyweed but also blue wild indigo and sundial lupine. With the decline of those species due to habitat loss, the skipper adapted to the introduced, locally abundant species crown vetch. Today, its range is rapidly expanding and its numbers are increasing wherever crown vetch has been widely planted.
Wild indigo duskywing has dark brown wings; a pale spot at the end of the forewing cell; and four translucent white spots at the leading edge near the tip of the forewing. Along with columbine duskywing and Perseus duskywing, it is part of the “Persius species complex”. They are very similar in appearance and difficult or impossible to distinguish in the field. Columbine duskywing is smaller, lighter, and has shorter wings. Perseus duskywing has not been recorded in Minnesota.