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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-1b -- Body wall smooth - The body wall of species in group A-1b is not extended into tubercles or warts.

Previous Section - Group A-1a - Body wall with lateral projections
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