Northern Prairie Wildlife Research Center
Wingspan 3.4 cm. Forewing is dark brown with a round yellow mark on the outer margin of the reniform spot. This noctuid is common and widely distributed in western North America. Moths fly in midsummer. Caterpillars are generalist feeders on foliage of flowering trees and shrubs such as maple (Acer), alder (Alnus), madrone (Arbutus menziesii), hazelnut (Corylus), Indian plum (Oemleria cerasiformis), ocean spray (Holodiscus discolor), currant (Ribes), willow (Salix), and snowbrush (Ceanothus velutinus).
Similar species: Aseptis adnixa forewing is more mottled in yellow and brown, occurs primarily in the wet coastal forests, we have collected and reared caterpillars only on foliage of Indian plum (Oemleria cerasiformis); Aseptis paviae is larger and pale gray, occurs in southwest Oregon and California, caterpillar host plant unknown.