Northern Prairie Wildlife Research Center
Wingspan 3.5 cm. Forewing has two jagged median lines, a large white discal spot, and a brown to black median area between the lines. This geometrid is particularly common west of the Cascade Mountains but widely distributed in western North America. Moths fly in midsummer. Caterpillars feed on foliage of species of Pinaceae, primarily Douglas-fir (Pseudotsuga menziesii) and western hemlock (Tsuga heterophylla).