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Wing expanse 18-27.5 mm. Forewing white, and hindwing dark brownish grey, darkest by fore edge and apex, gradually lighter toward back corner; generally lighter in southernmost populations. Some indidivuals with tan forewing coloration, primarily at higher elevation and in northern part of species range. Male genitalia with aedeagus 1.70-1.85 mm long, 0.03-0.04 mm in cross section; female genitalia with posterior apophyses 6.3-6.5 mm long, corpus bursae with signa 0.60-0.80 mm in diameter.