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Northern Prairie Wildlife Research Center

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Caterpillars of Pacific Northwest
Forests and Woodlands

Pyrrharctia isabella [Arctiidae]

Dense cover of hairs over body, midabdominal segments with reddish orange hairs, anterior and posterior segments with black hairs. This species is very common on grasses and herbs, such as nettles, during fall and spring. The caterpillar overwinters.

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Return to Photo Key to Species in Group B-2a - Less than half covered in long hairs

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