Six specimens (21249-21253, 212706 BS) from Rice, Arizona, were referred by Goldman (Proc. Biol. Soc. Washington, 46:76, April 27, 1933) to the subspecies _Thomomys bottae mutabilis_ Goldman when he proposed that name as new, but these six specimens were not mentioned by him when he later named _Thomomys bottae alienus_ (Jour. Washington Acad. Sci., 28:338, July 15, 1938), to which subspecies the specimens in question might be expected to belong. Examination of the six specimens reveals that they are intergrades between _T. b. mutabilis_ and _T. b. alienus_ but that the specimens more closely resemble the latter. More precisely, slightly larger size of skull, greater ventral inflation of tympanic bullae, and less depressed occipital region ally the specimens with _Thomomys bottae alienus_, and we identify them as that subspecies. The two subspecies concerned are not so distinct as are most subspecies of _Thomomys bottae_. ~Thomomys bottae aphrastus~ Elliott Bailey (N. Amer. Fauna, 39:58, November 15, 1915) referred three specimens from San Antonio, Baja California, to _Thomomys bottae nigricans_. These specimens have not, to our knowledge, been re-examined subsequently, although the current taxonomic treatment of the pocket gophers of Baja California by Huey (Trans. San Diego Soc. Nat. Hist., 10(4):245-268, 1 map, August 31, 1945) excludes _T. b. nigricans_ from the area of San Antonio. The pertinent specimens are probably Nos. 10810-10812 in the Chicago Natural History Museum. We have examined the specimens and, using the comparative materials listed under the account of _T. b. siccovallis_, find them to be intermediate in most characters between _T. b. aphrastus_ and _T. b. martirensis_. Because they more nearly resemble _T. b. aphrastus_ in the weakly-spreading zygomatic arches, we refer the specimens from San Antonio to that subspecies. ~Thomomys bottae jojobae~ Huey When Huey (Trans. San Diego Soc. Nat. Hist., 10:256, August 31, 1945) named _Thomomys bottae jojobae_ from Sangre de Cristo, Baja California, Mexico, he made no mention of a specimen that Bailey (N. Amer. Fauna, 39:58, November 15, 1915) identified as _Thomomys bottae nigricans_ from La Huerta, which place is approximately eight miles northwest of Sangre de Cristo. From a geographic standpoint, it seemed unlikely that the specimen from La Huerta would be referable to _T. b. nigricans_. Examination of the specimen (138752 BS) proves it to differ from topotypes of _T. b. nigricans_ and to agree with _T. b. jojobae_ in richer, more rufescent color, especially ventrally, and smaller, slenderer, more delicate skull. The specimen is therefore tentatively referred to _Thomomys bottae jojobae_. We have not, however, compared it with specimens of _Thomomys bottae juarezensis_, a subspecies the range of which lies to the east on the summit of the Sierra Juarez. ~Thomomys bottae martirensis~ J. A. Allen