Northern Prairie Wildlife Research Center
Wingspan 3.8 cm. Forewing is dark mottled gray with discal spots outlined and filled with darker gray; hindwing is gray. This noctuid is common and widely distributed in western North America. Moths fly in early to midsummer. Caterpillars feed on the foliage of bitterbrush (Purshia tridentata) and rose (Rosa).
Similar species: Acronicta fragilis forewing with contrasting black and white, hindwing white, widely distributed in western North America, caterpillars feed on cherry (Prunus); Raphia frater (Noctuidae) forewing gray, hindwing white, widely distributed.