Northern Prairie Wildlife Research Center
Wingspan 5.0 cm. Forewing is white to dark black-gray with jagged, dentate black lines; hindwing is white with a dark submarginal band or pure gray; males with pectinate antennae. This noctuid is common and widely distributed in western North America, particularly abundant in wet coastal forests. Moths fly in summer. Caterpillars feed on the foliage of species of Pinaceae.
Similar species: populations east of the Cascade Mountains are darker gray and have been called Panthea virginaria; Panthea gigantea is larger, forewing more elongate and nearly black, hindwing white, males with weakly pectinate antennae, uncommon but widely distributed in dry forests.