Northern Prairie Wildlife Research Center
Wingspan 3.0 cm. Forewing is gray with dark, sharply angled and dentate postmedian line. This geometrid is common and widely distributed in western North America. Moths fly during early to midsummer. Caterpillars of all species of Drepanulatrix feed only on the foliage of species of Ceanothus.
Similar species: Drepanulatrix secundaria is widely distributed in western North America, wings are pale yellow-brown to red-orange, forewing with a postmedian line of large dark blotches; Drepanulatrix monicaria is limited to the Pacific West, wings are gray to red-orange with a postmedian line of small dark spots; Drepanulatrix unicalcararia forewing with a sharply angled postmedian line which is not dentate.