Northern Prairie Wildlife Research Center
Wingspan 3.1 cm. Forewing is pale gray with a red submarginal border and no discal spots, the black basal line nearly straight, the postmedian line strongly curved inward and connected to the basal line with a black median bar; hindwing is brown. This noctuid is common and widely distributed in western North America. Moths fly in midsummer. Caterpillars feed on the foliage of snowberry (Symphoricarpos albus).
Similar species: three other species of Oncocnemis have a gray forewing and a basal line that is more strongly curved outward; Oncocnemis figurata hindwing is brown, widely distributed in western North America; Oncocnemis semicollaris hindwing is white, occurs in the Cascade Mountains from Oregon to British Columbia; Oncocnemis ragani is larger, hindwing white, common in California and southwest Oregon.