Full reference: S. H. Scudder. 1878. The Fossil Insects of the Green River Shales. Bulletin of the United States Geological and Geographical Survey of the Territories 4(4):747-776
Type specimen: 4002, an exoskeleton. Its type locality is Petrified fish cut (Scudder collection), which is in a Bridgerian lacustrine - large diatomite/shale in the Green River Formation of Wyoming.
Average measurements (in mm): body 5.65 x 2.75, elytron length 4.15