About Cercyonis oetus Boisduval, 1869
Cercyonis oetus, commonly known as the small wood-nymph or dark wood-nymph, is a butterfly species belonging to the family Nymphalidae. This species is found in western North America. The wingspan of adult Cercyonis oetus ranges from 32 to 45 mm. Adults have one generation per year, and are active on the wing from June to August. The larvae of this species feed on a variety of grasses.