Erebia cyclopius is a species of butterfly of the subfamily Satyrinae in the family Nymphalidae. It is found through Siberia (from the Urals to the Far East), northern Mongolia, northern China and North Korea.[1] The habitat consists of forest edges, flowery meadows and sparse larch forests.
The wingspan is 46–62 mm.
E. cyclopius Ev. (35 c). Upperside grey-brown. The forewing has on both surfaces a subapical, nearly circular, black ocellus with 2 white pupils and ochre-yellow border. The underside of the forewing is somewhat lighter than above and the yellow border of the eye-spot is much wider, the apex of the wing being feebly dusted with bluish grey. The hindwing beneath at the base likewise dusted with bluish grey for a considerable distance; a submarginal band bluish ashy grey, in some places interrupted by the ground-colour. The ocelli of the female are larger and more broadly ringed with yellow than in the male, the apex of the wing being more densely dusted with grey-blue. Antenna ringed black and white, the club russet yellow.— In the Ural, Altai, and Kentei Mts., on the Amur and its tributaries, and on Askold; in May,June and July in damp pine-woods, locally abundant. The largest specimens occur on Askold, having an especially large subapical ocellus.[2]
Adults are on wing from June to July.
The species overwinters in the larval stage.[3]