PaleoDB taxon number: 291198
Full reference: S. E. Lewis. 1971. A new species of fossil Diptera (Diopsidae) from the Ruby River Basin (Oligocene) of Montana. Annals of the Entomological Society of America 64:959-960
Type specimen: John Alley collection RR 6-390, an exoskeleton. Its type locality is Ruby River Site 6, which is in a Whitneyan lacustrine - large shale in the Renova Formation of Montana.
Average measurements (in mm): body 4.53 x 1.46