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Northern Prairie Wildlife Research Center

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Macromoths of Northwest Forests and Woodlands

Besma quercivoraria [Geometridae]

JPG-Besma quercivoraria

Wingspan 3.3 cm. Forewing is pale brown with a sharp, angular outer margin and three nearly straight dark lines. This geometrid is common west of the Cascade Mountains, principally in oak woodlands. Moths fly in midsummer. Caterpillars feed on foliage of oak (Quercus).

Similar species: Selenia alciphearia is larger, forewing with an orange apical patch.

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