Northern Prairie Wildlife Research Center
Wingspan 4.1 cm. Forewing is pale yellow-brown, with a wavy, darker brown median band. This geometrid is widely distributed in the Pacific West and in the northern Rocky Mountains. Moths fly in mid to late summer. Caterpillars feed on the foliage of species of Pinaceae, particularly Douglas-fir (Pseudotsuga menziesii), western hemlock (Tsuga heterophylla), sitka spruce (Picea sitchensis), and pine (Pinus).