Provo is the locality listed for specimens which were available to naturalists from 1875-1877. To these specimens the following names were applied: _Thomomys talpoides bulbivorus_ Coues (1875:256; 1877:627) and _Thomomys talpoides umbrinus_ Coues and Yarrow (1875:112). Possibly these names were applied to the animals currently known as _Thomomys bottae albicaudatus_ which does occur at Provo. Without the opportunity to examine the actual specimens, which so far as I know are no longer in existence, I cannot exclude the possibility that the locality designation "Provo" was used in a general sense to include pocket gophers taken a few miles to the eastward of Provo, where it is known that pocket gophers of only the species _Thomomys talpoides_ (current terminology) occur. _Specimens examined._--Total, 239, distributed as follows: _Davis County_: Bountiful, 4,500 ft., 1. _Salt Lake County_: Salt Lake City and environs, 4,300 ft., 51; 2 mi. W Murray, 4,300 ft., 6; Riverton, 4,300 ft., 11; Draper, 4,500 ft., 7; Rose Canyon, Oquirrh Mountains, 5,650 ft., 4. _Tooele County_: Bauer, 4,500 ft., 30; Settlement Creek, Oquirrh Mountains, 6,500 ft., 1; St. John, 4,300 ft., 28; Clover Creek, Onaqui Mountains, 5,500 ft., 15; Vernon, 4,300 ft., 2 (U. S. A. C.); Little Valley, Sheeprock Mountains, 5,500 ft., 20. _Utah County_: Fairfield, 4,800 ft., 24; Provo, 4,400 ft., 20 (8, B. Y. U.; 12, M. V. Z.). _Juab County_: Neff Farm, 4 mi. N Nephi, 5,000 ft., 2 (1, R. H.); Nephi, 5,000 ft., 1 (M. V. Z.); 2 mi. S Nephi, 4,700 ft., 14; 7 mi. SW Nephi, 6,000 ft., 2. =Thomomys bottae bonnevillei= new subspecies _Type._--Male, adult, skin and skull, No. 3576, Museum of Zooelogy, University of Utah; Fish Springs, 4,400 ft., Juab County, Utah; June 8, 1940; collected by S. D. Durrant; original number 1955. _Range._--Known only from the type locality. _Diagnosis._--Size medium (see measurements); claws on front feet small. Color: Entire dorsal surface Warm Buff; sides near (_e_) Cinnamon Buff, underparts near (16") Pale Pinkish Buff; inguinal region, front and hind feet and distal part of tail white: top of head, nose and cheeks grayish black; postauricular patches small and grayish black; ears small, pointed and with heavily pigmented pinnae. Skull: Angular, short and wide; nasals of medium length, narrow proximally but widely flared distally; interparietal small; lambdoidal suture concave towards the interparietal; zygomatic arches uniformly widely spreading; interpterygoid space widely V-shaped; extension of premaxillae posterior to nasals long; lambdoidal crest well developed.