Northern Prairie Wildlife Research Center
Dark green dorsum and light green venter; white spiracular line, dorsal edge with a red line; faint discontinuous yellow longitudinal line and oblique subdorsal lines; green head. This caterpillar is common on bitterbrush and species of Ceanothus during May and June. It is similar in appearance to Aseptis binotata. These two species differ in the appearance of the faint white lines on the dorsal surface.