Northern Prairie Wildlife Research Center
Wingspan 3.6 cm. Forewing with alternating bands of green and black. This geometrid is common in wet conifer forests of western North America. Moths fly in midsummer. Caterpillars feed on the foliage of species of Pinaceae such as grand fir (Abies grandis), spruce (Picea), pine (Pinus), Douglas-fir (Pseudotsuga menziesii), and western hemlock (Tsuga heterophylla).
Similar species: Hydriomena furcata forewing with alternating bands of red-brown and black but the basic wing color is a red brown, common and widely distributed in western North America, moths fly in late summer, caterpillars feed on foliage of willow (Salix).