Photographed shortly after 7 PM on the window of our local post office.

Based on text from the University of Alberta, I believe this is a male. Habitat (at least in Alberta) is wooded riparian shrub. Life history is poorly known, according to the university, which adds, "There is a single brood each year, with adults flying in late spring [I assume in Alberta]. Adults are nocturnal and come to light." Caterpillars eat willow (Salix), catclaw (Acacia) and oak (Quercus). This species ranges from the southern USA and north to New Jersey, the southern Prairie Provinces, and Vancouver Island.