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Northern Prairie Wildlife Research Center

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Macromoths of Northwest Forests and Woodlands

Perizoma grandis [Geometridae]

JPG-Perizoma grandis

Wingspan 2.4 cm. Forewing with alternating dark and pale red-brown bands and a black subapical patch. This geometrid is common in the wet conifer forests of the Pacific Coast. Moths fly in midsummer. The caterpillar host plant is unknown.

Similar species: Perizoma curvilinea forewing is pale gray with alternating fine black lines and bands, caterpillars feed on foliage of ocean spray (Holodiscus discolor); Perizoma costiguttata forewing is pale gray with broad black costal bars, caterpillars feed on foliage of ocean spray; Anticlea vasiliata (Geometridae) is larger, forewing red-brown with variable white and black bands, moths are very common and fly in early spring, caterpillars feed on foliage of rose (Rosa) and thimbleberry (Rubus parviflorus).

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