Spermophilus lateralis (Say, 1823) . In Long, Account Exped. Pittsburgh to Rocky Mtns, 2:46.

TYPE LOCALITY: "near Cafion City." Restricted by Merriam (1905: 163) to Arkansas River, about 26 mi. (42 km] below Canyon City, Fremont Co., Colorado [USA] .

DISTRIBUTION: Montane W North America, from C British Columbia to S New Mexico in the Rocky Mtns, and the Columbia River south to S California and Nevada.

SYNONYMS: arizonensis (V. Bailey, 1913); bernardinus Merriam, 1898; brevicaudus Merriam, 1893; caryi (A. Howell, 1917); castanurus (Merriam, 1890); certus (Goldman, 1921); chrysodeirus (Merriam, 1890); cinerascens (Merriam, 1890); connectens (A. Howell, 1931); mitratus (A. Howell, 1931); tescorum (Hollister, 1911); trepidus (Taylor, 1910); trinitatus (Merriam, 1901); wortmani (J. Allen, 1895).

COMMENTS: Subgenus Callospermophilus (Hall, 1981:406) . Gromov et al. (1965:150) considered Callospermophilus a subgenus of the genus Otospermophilus .