_Diagnosis._--Size small (see measurements). Color dark, entire dorsal surface Cinnamon-Buff, purest on sides, flanks and cheeks; upper parts strongly suffused with black; arietiform markings, pinnae of ears, plantar surfaces of hind feet, dorsal and ventral stripes of tail, brownish. Skull small; upper incisors long; rostrum deep; jugal bowed laterally; diastema long; upper molariform tooth-row long. _Comparisons._--From _Dipodomys ordii panguitchensis_, _D. o. fremonti_ differs in: Color lighter in all pigmented areas, particularly ears which are light brown in _D. o. fremonti_ and black in _D. o. panguitchensis_; skull larger in all measurements taken; upper incisors longer; rostrum deeper; auditory bullae deeper; jugal bowed laterally rather than straight; diastema longer. From _Dipodomys ordii cupidineus_, _longipes_, _nexilis_, _uintensis_ and _sanrafaeli_, _D. o. fremonti_ can readily be distinguished by its smaller size and generally darker color. _Remarks._--This subspecies of _Dipodomys ordii_ inhabits the upper reaches of the Fremont River in west-central Wayne County, Utah. _D. o. fremonti_ appears to be isolated and is known only from the type locality. _D. o. fremonti_ is so remarkably different from any other subspecies of _Dipodomys ordii_ that a long period of isolation from the ancestral stock (which probably gave rise also to _Dipodomys ordii utahensis_ and _Dipodomys ordii panguitchensis_) is indicated. Although intergradation is not known to occur with other kinds, differentiation has not progressed far enough for these animals to be recognized as a distinct species. The subspecies closest, geographically, to _D. o. fremonti_ is _D. o. cupidineus_ from which _D. o. fremonti_ differs more than from any of the other named forms. _Specimens examined._--Total, 9, from Utah, as follows: _Wayne County_: Torrey, 7000 ft., 9 (CM). =Dipodomys ordii uintensis= Durrant and Setzer _Dipodomys ordii uintensis_ Durrant and Setzer, Bull. Univ. Utah, 35 (no. 26):27, June 30, 1945. _Perodipus longipes_, Allen, Bull. Amer. Mus. Nat. Hist., 8:246, November 1896 (part--the part from Uncompahgre Indian Reservation, Utah). _Dipodomys ordii luteolus_, Moore, Journ. Mamm., 11:88, February, 1930 (part--the part from Vernal, Utah). _Type._--Male, adult, no. 11634, Carnegie Museum, Pittsburgh, Pennsylvania; Red Creek, 6,700 ft., 2 mi. N Fruitland, Duchesne County, Utah; obtained on August 15, 1936, by J. K. and M. T. Doutt, original no. 3433. _Range._--Uinta basin of the White, Green and Duchesne river drainage in northeastern Utah; marginal occurrences are: 2 mi. N Fruitland, 10 mi. S Ouray, Vernal.