_Diagnosis._--Size small (see measurements). Color: Upper parts and sides Cinnamon Buff, finely mixed with black along median line of back; underparts Pinkish Buff; nose, cheeks and chin grayish black; postauricular patches fairly large and grayish black; front and hind feet white (examples from type series badly stained); tail light buff but apparently white distally (the color of these specimens has apparently changed with age). Skull: Small, fairly robust; basilar length short; zygomatic arches weak, but widely spreading; tympanic bullae small; nasals short and simple distally; ventral margin of jugals convex dorsally; extension of premaxillae posterior to nasals relatively as well as actually long; posterior tongues of premaxillae relatively wide. _Comparisons._--Topotypes of _levidensis_ differ from those of _Thomomys bottae absonus_ as follows: Size smaller. Color: Lighter throughout. Skull: Shorter, weaker and less ridged and angular, but relatively wider. Compared with topotypes of _Thomomys bottae albicaudatus_, _levidensis_ differs as follows: Size smaller in every measurement taken. Color: Markedly lighter throughout. Skull: Smaller in every measurement taken; width relatively greater; skull smooth, weak and nonangular as opposed to ridged, robust and angular. For comparisons with _Thomomys bottae lenis_ and _contractus_ see accounts of those forms. _Remarks._--The range here ascribed to _levidensis_ is the San Pitch River Valley, which gradually merges southward into the Sevier River Valley. The latter valley in this area is inhabited by pocket gophers that belong to another subspecies, _lenis_. Nephi Valley to the west of San Pitch River Valley is inhabited by animals belonging to the subspecies _albicaudatus_. No known specimens show intergradation between _lenis_ and _levidensis_, but intergradation between _lenis_ and _albicaudatus_ is noted in the Nephi Valley animals (see account of _albicaudatus_). Superficially _levidensis_ resembles _absonus_ in size and color, but the skulls closely resemble those of _albicaudatus_, except for size in which they are smaller in all measurements. _T. b. albicaudatus_ is the most variable subspecies of _T. bottae_ occurring in Utah, and additional material from the Sevier River Valley between San Pitch River Valley and Nephi Valley may show _levidensis_ to be only a local variant of the highly variable subspecies, _albicaudatus_. _Specimens examined._--Total, 6, from the type locality. =Thomomys bottae osgoodi= Goldman _Thomomys perpallidus osgoodi_ Goldman, Journ. Washington Acad. Sci., 21:424, October 19, 1931. _Thomomys bottae osgoodi_ Goldman, Proc. Biol. Soc. Washington, 48:156; October 31, 1935. _Thomomys perpallidus aureus_ Bailey, N. Amer. Fauna, 39:75, November 15, 1915; Barnes, Bull. Univ. Utah, 12 (No. 15):85, April, 1922; Bull. Univ. Utah, 17 (No. 12):100, June, 1927.