Caterpillars have yellow faces and are fleshy and green when young. They are wider at the head and neck than at the rear. Small eyespots behind the head are followed by a white and black lined collar of sorts. Tiny light blue/lavender dots ring the segment before the collar with more on the third through sixth segments after the collar. Caterpillars of this species are found eating the leaves of chokcherry, hoptree and ash trees.
Adults are found near water sources like streams and creeks. They drink flower nectar and can be spotted on blossoms as well as in flight. They are active spring through autumn. Look for them in canyons, woodlands and areas with moving water.