Northern Prairie Wildlife Research Center
Wingspan 4.1 cm. The wings are dark gray with broad wavy black lines. This geometrid is limited in its occurrence to the Pacific West from southwestern Oregon to central California. Moths fly in fall. Caterpillars feed on the foliage of pine (Pinus).
Similar species: Cochisea sinuaria wings are pale gray with narrow black lines. Biston betularia and species of Lycia (Geometridae) are similar in appearance but fly at different times of the year.