Spermophilus spilosoma Bennett, 1833 . Proc. Zool. Soc. Lond., 1833:40.

TYPE LOCALITY: "that part of California which adjoins to Mexico." Restricted by Howell (1938: 122) to Durango [City], Durango, Mexico .

DISTRIBUTION: C Mexico to S Texas, SW South Dakota, and NW Arizona (USA).

SYNONYMS: altiplanensis Anderson, 1972; ammophilus Hoffmeister, 1959; annectens Merriam, 1893; arens V. Bailey, 1902; bavicorensis Anderson, 1972; cabrerai (Dalquest, 1951); canescens Merriam, 1890; cryptospilotus Merriam, 1890; macrospilotus Merriam, 1890; major Merriam, 1890; marginatus V. Bailey, 1902; microspilotus Elliot, 1901; obsidianus Merriam, 1890; obsoletus Kennicott, 1863; oricolus Alvarez, 1962; pallescens (A. Howell, 1928); pratensis Merriam, 1890.

COMMENTS: Subgenus Ictidomys (Hall, 1981:395) . Reviewed by Streubel and Fitzgerald (1978a, Mammalian Species, 101).