Northern Prairie Wildlife Research Center
Wingspan 3.9 cm. Forewing is pale gray with narrow black basal and postmedian lines and darker gray basal and postmedian bands. This thyatirid is common in wet conifer forests east of the Cascade Mountains. Moths fly in fall. Caterpillars feed on the foliage of willow (Salix), serviceberry (Amelanchier alnifolia), and mountain ash (Sorbus scopulina).
Similar species: Ceranemota improvisa forewing with median band pale gray to white, basal and postmedian bands are black to dark gray-brown; Ceranemota fasciata forewing with median band broad and white, postmedian lines are pink and black, basal and postmedian bands are pale gray; Ceranemota crumbi forewing is solid dark gray with obscure basal and postmedian lines. These three species occur in wet conifer forests west of the Cascade Mountains and they fly in fall.