Full reference: S. H. Scudder. 1890. The Tertiary Insects of North America. Report of the United States Geological Survey of the Territories XIII:1-734
Type specimen: PU 1.121, an exoskeleton. Its type locality is Florissant (former Princeton collection), which is in an Eocene lacustrine - large shale/volcaniclastic in the Florissant Formation of Colorado.
Average measurements (in mm): body 7.25 x 2.75