Northern Prairie Wildlife Research Center
Wingspan 3.2 cm. Forewing with a black median band, a dark brown basal band, and a yellow apical patch. This geometrid is common and widely distributed in western North America. Moths fly in midsummer to fall. Caterpillars feed on the foliage of flowering trees and shrubs such as alder (Alnus) and thimbleberry (Rubus parviflorus).