Tyrannosaurus regina sp. nov. (Morphotype III)

Etymology: Tyrant lizard queen.

Holotype: USNM 555000

Referred specimens: exBHI 3033, MOR 980, LACM 23485, LL 12823, TMP 81.6.1, LACM 23845 .

Age and stratigraphy: Latest Maastrichtian, upper and possibly middle Hell Creek and Lance, Ferris, Denver, Frenchman, Willow Creek, Scollard.

Diagnosis: Generally gracile with an adult femur-length/ circumference ratio over 2.4, usually one slender anterior incisiform dentary tooth.

Geographic distribution: Montana, Colorado, Dakotas, Wyoming, Alberta, Saskatchewan.