Uncommon. Flies May through October. The Ox-eyed Satyr is a subspecies of the Common Wood Nymph (Cercyonis pegala), a North American butterfly in the family Nymphalidae. The common wood-nymph can vary greatly. All individuals are brown with two eyespots on each forewing – the lower one often being larger than the upper one. Some may have many, few, or no eyespots on the ventral surface of the hindwing.