Northern Prairie Wildlife Research Center
Wingspan 3.4 cm. Forewing is pale and speckled gray with jagged dentate black postmedian and basal lines. This geometrid is often abundant west of the Cascade Mountains but otherwise common and widely distributed in western North America. Moths fly in midsummer. Caterpillars feed on the foliage of species of Pinaceae, particularly grand fir (Abies grandis), Douglas-fir (Pseudotsuga menziesii), and western hemlock (Tsuga heterophylla).
Similar species: Enypia venata is larger and darker in color, often with a black median area; Epirranthis substriataria (Geometridae) forewing with large round discal spots and is usually uncommon, moths fly in spring; Philedia punctomacularia (Geometridae) forewing with small black dashes instead of lines, moths fly in fall.