Thomomys townsendii (Bachman, 1839) . J. Acad. Nat. Sci., Philadelphia, 8:105.

TYPE LOCALITY: USA, erroneously given as "Columbia River", but restricted to Idaho, Canyon Co., near Nampa, by Bailey (1915) .

DISTRIBUTION: Snake River Valley of Idaho south and west to SE Oregon, NE California, and N Nevada (USA).

SYNONYMS: atrogriseus Bailey, bachmani Davis, elkoensis Davis, nevadensis Merriam, owyhensis Davis, relictus Grinnell, similis Davis.

COMMENTS: Revised by Davis (1937) and Rogers (1991«, b). Considered a distinct species by Thaeler (1968b), Patton et al. (1984), Patton and Smith (1989), and Rogers (1991«, b), despite limited hybridization with bottae in NE California. Hall (1981:469, 495) reviewed Thaeler's evidence and included townsendii in umbrinus (sensu Hall) .