Northern Prairie Wildlife Research Center
Darker green dorsally with small white dots, lighter green ventrally with a white hue and small white dots; lateral off-white band bordered with streaks of red, mostly on thorax and posterior abdominal segments. This caterpillar is common on bitterbrush and species of Ceanothus during June and July. It is similar in appearance to Eupithecia ravocostaliata. These two species differ in the patterns of the green body and the red spiracular line, and in host plants.