Sympistis cocytus is a moth of the family Noctuidae first described by James T. Troubridge in 2008.[1] It is found in North America from south central British Columbia south to eastern Oregon at elevations from the tree line to the ponderosa pine zone of 2000feetto6300feetft (toft).
The wingspan is 32to. Adults are on wing from mid-August to late September.[2]