This species is known for its highly variable wing patterns. Moths can range from a pale cream color to brilliant yellow or orangish. Wings may be entirely free of markings, may have hollow discal spots, may have lines, or may have a brown-filled median area.
According to Rindge (1974), the variability does not appear to have a geographic basis--all forms may be present in any given location.
There are several similar western species in this genus, but no others in the east.
Distribution pattern: Transcontinental.
This species appears to have been collected much more densely in the West.
Reilly pers obs
hese moths emerge in summer, and there is one generation per year.
Generalist. Feeds on many trees and shrubs including: Larix, Salix, Pinus, Betula, Prunus, Cornus, etc (Rindge 1974).
Rindge FH. 1974. A revision of the moth genus Hesperumia (Lepidoptera Geometridae). American Museum Novitates 2561: 1-24.
McGuffin WC. 1977. Guide to the Geometridae of Canada (Lepidoptera) II. Subfamily Ennominae. 2. Memoirs of the Entomological Society of Canada 101: 1-125.
Covell CV. 1984. A field guide to the moths of Eastern North America. Houghton Mifflin Company: Boston. 496 pp.