Species: ? eurycephalus SCHLAIKJER, 1935 (nomen dubium)
Etymology:

Holotype: MCZ 1102

Locality: Horse Creek, Goshen County, NE 1/4, sec. 4, T22N, R61W, Wyoming.

Horizon: Torrington Member, Lance Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Fragmentary skull and fragmentary dentary and parts of skeleton.

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Species: olsoni (COBABE & FASTOVSKY, 1987) FOSTER, 1993 (nomen dubium)
Etymology: In honor of Norman Olson, on whose ranch the specimen was found.
= Ugrosaurus olsoni COBABE & FASTOVSKY, 1987 (nomen dubium)

Holotype: UCMP 128561

Locality: UCMP V83224, Norman Olson Ranch, sec. 2, T20N, R37E, Maloney Hill, Garfield County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: A partial snout, including rostral pit, nasal boss, and maxillary process of the premaxillary, edentulous jaw material, an isolated vertebra; and unidentified ?skull and frill fragments.