_Remarks._--In Utah, _gracilis_ is limited to the extreme northwestern corner of the state. This part of the state is in the Snake River drainage. The main part of the range of this race lies in south-central and southwestern Idaho and northeastern Nevada. The center of its range might be considered to be in the Jarbidge Mountains area of Nevada. The south slopes of these mountains are in the Humboldt River drainage, while the north slopes are in the Snake River drainage, and this subspecies occurs as far north as the Snake River and south and west almost to central Nevada. No specimens are available from the area in Utah between the Raft River Mountains inhabited by _gracilis_ and the Wasatch Mountains in central Utah inhabited by _wasatchensis_. Judging from the nature of the terrain, the range of _gracilis_ does not extend eastward much beyond the Raft River Mountains. The type locality for a gopher of a different species, _Thomomys bottae aureiventris_, is in the first valley east of these mountains. Furthermore, all valleys to the east and south, as far as known, are inhabited by gophers of the _bottae_ group. Also, all mountain ranges in this area, as far east as the Wasatch Mountains are inhabited by members of the _bottae_ group. No specimens from Utah indicate intergradation between _gracilis_ and _wasatchensis_, the form to the east, but specimens from farther north at Albion, Cassia County, Idaho, do show intergradation. Bailey (1915:116), Hall (1931:4), and Durrant (1939:6) have reported on these specimens which at the present time seem best referred to _T. t. gracilis_. _Specimens examined._--Total, 24, distributed as follows: _Box Elder County_: Yost, 4 (U. S. A. C.); Pine Canyon, 6,600 ft., 17 mi. NW Kelton, 7 (M. V. Z.): Lynn Canyon, Raft River, 4; Park Valley, 3 (U. S. A. C.); Etna, 4 (U. S. A. C.); Raft River Mountains, Clear Creek Camp of Minnedoka National Forest, 1 (R. H.); Raft River Mountains, 1,500 feet above Clear Creek Camp of Minnedoka National Forest, 1 (R. H.). =Thomomys talpoides wasatchensis= new subspecies _Thomomys quadratus uinta_ Hall, Univ. California Publ. Zooel., 37:4, April 10, 1931. _Thomomys talpoides uinta_ Goldman, Journ. Mamm., 20:234. May 14, 1939. _Thomomys uinta_ Bailey, N. Amer. Fauna, 39:114, 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. _Type._--Male, adult, skin and skull, No. 1604, Museum of Zooelogy, University of Utah; Midway, 5,500 ft., Wasatch County, Utah; September 1, 1936; collected by S. D. Durrant; original number 1049. _Range._--Wasatch Mountains and neighboring high valleys as far south as Spanish Fork Canyon, Utah County.