Full reference: W. D. Matthew. 1907. Bulletin of the American Museum of Natural History 23(9)
Type specimen: AMNH 12886, a partial skeleton (skull, lower jaws, and partial postcranial skeleton). Its type locality is Monroe Creek (AMNH Rosebud 12), which is in a Monroecreekian terrestrial horizon in the Monroe Creek Formation of South Dakota.
Ecology: ground dwelling carnivore-omnivore
Average measurements (in mm): P4 22.6 x 13.3, M1 11.8 x 16.5, M2 2.90 x 4.40, p4 14.0 x 8.1, m1 23.3 x 9.8, m2 7.83 x 5.73