Northern Prairie Wildlife Research Center
Dark green dorsum and light green venter with off-white speckles; white spiracular band, dorsal edge with a red line; faint discontinuous off-white subdorsal line; green head. This caterpillar is very common on many broadleaf trees and shrubs such as big-leaf maple, ocean spray, and species of Ceanothus during May and June. It is similar in appearance to Aseptis fumosa. These two species differ in the appearance of the faint white lines on the dorsal surface.