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Wing expanse 18-29 mm. Forewing wide and blunt, usually white but occasionally with more or less tan coloration in northeastern part of range. Hindwing medium to light brownish grey, darkest by apex, gradually turning white toward hind corner; generally lighter in southernmost populations. Female with vestigial maxillary tentacles. Male genitalia with aedeagus 1.3-1.5 mm long, 0.07-0.08 mm in cross section; female genitalia with posterior apophyses 4.6-5.3 mm long, corpus bursae with signa 1.20-1.30 mm in diameter.