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Northern Prairie Wildlife Research Center

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Macromoths of Northwest Forests and Woodlands

Pyrrharctia isabella [Arctiidae]

JPG-Pyrrharctia isabella

Wingspan 5.3 cm. Wings with small black spots; forewing is mustard-yellow; hindwing is yellow-orange. This arctiid is widely distributed in western North America and is particularly common west of the Cascade Mountains. Moths fly in midsummer. Caterpillars are generalist feeders on foliage of herbaceous plants such as nettle (Urtica).

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