Cercyonis oetus

Cercyonis oetus, the small wood-nymph or dark wood-nymph, is a butterfly of the family Nymphalidae. It is found in western North America.

The wingspan is 32–45 mm. Adults are on wing from June to August in one generation.

The larvae feed on various grasses.

Subspecies
There are four recognized subspecies:
 * Cercyonis oetus oetus
 * Cercyonis oetus charon (Edwards, 1872)
 * Cercyonis oetus silvestris (Edwards, 1861)
 * Cercyonis oetus pallescens T. & J. Emmel, 1971