Erynnis pacuvius
Erynnis pacuvius, the Pacuvius duskywing, Dyar's duskywing or buckthorn dusky wing, is a skipper butterfly of the family Hesperiidae. It is found in most of the western United States and in southern British Columbia.
The wingspan is 29–33 mm. The flight period is between June and July in the north with a second generation in the south.
The larvae feed on Ceanothus species.
