Full reference: T. D. A. Cockerell. 1921. Some Eocene Insects from Colorado and Wyoming. Proceedings of the United States National Museum 59:29-39
Type specimen: USNM 66929, an exoskeleton (beetle missing head). Its type locality is White River (Scudder collection), which is in a Bridgerian lacustrine - large shale in the Green River Formation of Utah.
Average measurements (in mm): body length 12.2