Northern Prairie Wildlife Research Center
Wingspan 2.4 cm. Forewing is white with a mottled pattern of fine black lines and spots. This arctiid is common in woodlands and forests west of the Cascade Mountains. Moths fly in late summer. Caterpillars feed in lichens on trees and large shrubs, caterpillars are common on Oregon white oak (Quercus garryana) upon which they also may feed on the foliage.
Similar species: some Eupithecia, such as Eupithecia misturata, are similar in size and coloration but show different markings on the wings.