Northern Prairie Wildlife Research Center
Wingspan 4.4 cm. Forewing is light orange to red-brown with a dark red-brown submarginal border, discal spots outlined in black; hindwing is white with a dark border; thorax is dark red-brown; abdomen is yellow. This noctuid is widely distributed in wet forests over much of western North America. Moths fly in late spring. Caterpillar host plants are gooseberries (Ribes) and willows (Salix).
Similar species: Sideridis maryx forewing is dark red-black without markings, hindwing dark, occurs at high elevations in the northern Rocky Mountains and Cascade Mountains, caterpillar host plant unknown.