Full reference: T. D. A. Cockerell. 1906. Fossil Hymenoptera from Florissant, Colorado. Bulletin of the Museum of Comparative Zoology, Harvard College 50(2):33-58
Type specimen: Mus. Comp. Zool. No. 2029, an exoskeleton. Its type locality is Florissant (MCZ Collection), which is in a Chadronian lacustrine - large shale in the Florissant Formation of Colorado.
Average measurements (in mm): body 14.5 x 5.0, forewing length 10.0