Species: utahensis GILMORE, 1940
Etymology: In reference to the state of Utah.

Holotype: USNM 15668

Locality: South Dragon, Manti National Forest, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

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

Material: Left dentary with teeth.

Referred material:

USNM 15876: Tooth-bearing fragment.

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Species: gazini GILMORE, 1943
Etymology:

Holotype: USNM 16580

Locality: South Dragon, Manti national Forest, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

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

Material: Imperfect skull, articulated with the lower jaws, upper and lower teeth, associated with shore sections of articulated vertebrae and fragmentary ribs.