Northern Prairie Wildlife Research Center
Wingspan 4.0 cm. Forewing of our subspecies, Stenoporpia pulmonaria albescens, is white to gray with wavy black lines. This subspecies occurs in wet conifer forests in the Pacific West. Moths fly in late summer and early fall. Caterpillars feed on the foliage of species of Pinaceae.
Similar species/subspecies: many species have similar gray, brown, or white colors with fine, wavy black lines but species of Stenoporpia are characterized by their larger size; Stenoporpia pulmonaria dejecta wings are mottled with red-purple colors, occurs in pine forests in western North America, caterpillars feed on ponderosa pine (Pinus ponderosa); Stenoporpia pulmonaria pulmonaria occurs in the southern Rocky Mountains; Stenoporpia separataria forewing with wavy lines, moths fly in late spring to early summer; Stenoporpia excelsaria forewing with straight lines, moths fly in late spring to early summer.