Spermophilus mexicanus (Erxleben, 1777) . Syst. Regn. Anim., 1:428.

TYPE LOCALITY: "in nova Hispania?" Restricted by Mearns (1896:443) to "Toluca, [Mexico,] Mexico."

DISTRIBUTION: S New Mexico and W Texas (USA) to Jalisco and S Puebla (C Mexico).

SYNONYMS: parvidens Mearns, 1896 .

COMMENTS: Subgenus Ictidomys (Hall, 1981:394) . Known to hybridize at several localities with tridecemlineatus (Cothran and Honeycutt, 1984; Cothran et al., 1977). Reviewed by Young and Jones (1982, Mammalian Species, 164).