Northern Prairie Wildlife Research Center
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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