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Upperside an even, dark grey-brown with two dark forewing eyespots. Underside with fine, dark striations and fore- and hindwing eyespots, hindwing postmedian area with grey frosting. C. pegala is similar, but oetus has the upper forewing spot larger than the lower one, is slighlty smaller overall, and lacks the blue scales often found in the forewing underside spots of pegala. Our populations have been referred to either subspecies charon or sylvestris (Guppy & Shepard 2001, Layberry et al. 1998). Bird et al (1995) point out that these names do not describe Alberta populations very well.

Undescribed in Alberta. The yellow eggs turn orange brown and are laid singly. The larvae are green with dark dorsal and pale subdorsal and lateral lines, and are covered in fine white hairs (Scott 1986). First instars hibernate before beginning to feed in the spring (Scott 1986). Pupae are various shades of green.