Northern Prairie Wildlife Research Center
Wingspan 4.7 cm. Forewing is pale yellow with a gray costal margin, black apical dashes, and a narrow black reniform spot; hindwing is yellow in males and gray in females. This notodontid is common and widely distributed in western North America. Moths fly in midsummer. Caterpillars feed on the foliage of willow (Salix), apple (Malus), maple (Acer), and poplar (Populus).