Northern Prairie Wildlife Research Center
Wingspan 4.3 cm. Forewing is black with narrow yellow-red streaks; hindwing is red-orange with a black border and central black spots of variable proportions; head is yellow with the thorax striped in yellow and black. This arctiid is common and widely distributed in western North America. Moths fly in early summer. Caterpillars are generalist feeders on foliage of herbaceous plants.
Similar species: Grammia behrii hindwing with few black marks, head and thorax black, uncommon and occurs in California and southwest Oregon; Grammia nevadensis hindwing is pale pink, common in juniper woodlands east of the Cascade Mountains.