_Thomomys uinta_ Merriam, Proc. Biol. Soc. Washington, 14:112, July 19, 1901; Bailey, N. Amer. Fauna, 39:113, November 15, 1915; Barnes, Bull. Univ. Utah, 12 (No. 15):83, April, 1922; Bull. Univ. Utah, 17 (No. 12):104, June, 1927; Stanford, Journ. Mamm., 12:360; November 11, 1931; Goldman, Journ. Washington Acad. Sci., 28:333, July 15, 1938; Davis, The Recent mammals of Idaho, pp. 239, 259, The Caxton Printers, Ltd., Caldwell, Idaho, April 5, 1939. _Thomomys talpoides uinta_ Goldman, Journ. Mamm., 20:234, May 14, 1939. _Thomomys quadratus uinta Hall_, Univ. California Publ. Zooel., 37:4, April 10, 1931. _Type._--Male, adult, skin and skull, No. 22501/30051, U. S. National Museum (Biological Surveys Collection); north base Gilbert Peak, Uinta Mountains, 10,000 ft., Summit County, Utah; June 6, 1890; collected by Vernon Bailey; original number 1262 (after Merriam, type not seen). _Range._--Uinta Mountains in Duchesne County, eastern Wasatch and Summit counties, and western Uintah County south to the Roan, Brown and Book cliffs in Carbon County. _Diagnosis._--Size medium (see measurements). Color: Upper parts Snuff Brown finely mixed with black, paling over sides and flanks to near Pinkish Buff on underparts; postauricular patches relatively small and dusky; external opening of ear large; pinnae usually lightly pigmented; hind feet white; front feet usually white only at base of toes; distal third to half of tail white; tail usually light below, with proximal dorsal half covered with darker hairs; nose, chin, cheeks and top of head dusky; usually considerable white on throat. Skull: Small, slender, and not heavily ridged; nasals short and dilated distally; posterior margins of nasals emarginate; zygomatic arches moderately widely spreading, widest posteriorly; interparietal pentagonal or subquadrangular; interpterygoid space V-shaped; tympanic bullae well inflated ventrally; upper incisors long and narrow. _Comparisons._--For comparisons with other subspecies of _Thomomys talpoides_, see accounts of those forms. _Remarks._--The range formerly ascribed to _uinta_ (Bailey, 1915:114; Barnes, 1922:83, 1927:104) is now known to be inhabited by animals belonging to three distinct subspecies. The range of _uinta_ as now understood is restricted to the southern and western parts of the Uinta Mountains and their environs. Three specimens from the Book Cliffs, Sunnyside, Carbon County, are not typical, but in a majority of their characters agree with _uinta_ to which they are here referred.