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-1a -- Body wall with lateral projections - Caterpillars in groups A-1a have lateral flanges, warts, or tubercles.
Return to Photo Key to Species
Next Section -- Group A-1b - Body wall smooth