Macromoths of Northwest Forests and Woodlands
Orthonama centrostrigaria [Geometridae]
Wingspan 2.3 cm. Forewing is pale brown with a dark brown median band, median band is abruptly interrupted by a pale area near the discal spot, discal spot is small and black. This geometrid is very common in the Pacific West. Moths fly throughout the year. Caterpillars feed on the foliage of herbaceous plants.
Similar species: Orthonama obstipata is dimorphic with solid dark red-brown forewing or the forewing is pale yellow with dark bands, is uncommon but widely distributed in western North America; in species of Xanthorhoe (Geometridae) the median band is not interrupted.
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