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Northern Prairie Wildlife Research Center

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Caterpillars of Pacific Northwest
Forests and Woodlands

Photo Key to Species

Group A-1 - Species in group A-1 have only one pair of midabdominal prolegs, on segment A6. All of these species are Geometridae.

Group A-1a -- Body wall with lateral projections - Caterpillars in groups A-1a have lateral flanges, warts, or tubercles.

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Next Section -- Group A-1b - Body wall smooth

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