_Dipodomys ordii columbianus_, Hall, Univ. California Publ. Zool., 37:5, April 10, 1931 (part--the part from Ogden, Utah.) _Type._--Male, adult, no. 55115, U. S. Nat. Mus. Biol. Surv. Coll.; Ogden, Weber County, Utah; obtained on July 15, 1893, by Vernon Bailey, original no. 4085. _Range._--Between Great Salt Lake and the Wasatch Mountains from extreme northern Utah, south to northern Sevier County, Utah; marginal occurrences, all in Utah, are: Promontory Point, Ogden, St. John, Cedar Valley, Nephi, Aurora, Spring City, Provo and 4 mi. N Draper. _Diagnosis._--Size small (see measurements). Color dark, entire dorsal surface (_a_) between Cinnamon-Buff and Clay Color, purest on sides, flanks and cheeks, with heavy admixture of black in upper parts; arietiform markings, pinnae of ears, plantar surfaces of hind feet, dorsal and ventral stripes of tail blackish. Skull small; rostrum short and narrow; interorbital region moderately wide; interparietal large, spatulate anteriorly; lacrimal processes relatively large; braincase vaulted; zygomatic arches robust and straight; auditory bullae relatively, as well as actually, greatly inflated. _Comparisons._--From _Dipodomys ordii marshalli_, _D. o. utahensis_ differs as follows: Size smaller; color darker; skull smaller; rostrum longer and narrower; interorbital region wider; lacrimal processes larger; interparietal region larger; auditory bullae less inflated; palate longer and narrower. From _Dipodomys ordii pallidus_, _D. o. utahensis_ differs in: Size smaller; color darker; skull smaller; rostrum shorter and narrower; interorbital region narrower; auditory bullae less inflated laterally, posteriorly and ventrally; interparietal region larger; lacrimal processes smaller; foramen magnum with ventral notch as opposed to rounded ventrally; pterygoid fossae circular as opposed to subcircular; palate longer and narrower. From _Dipodomys ordii cinderensis_, _D. o. utahensis_ differs as follows: Size larger, except hind foot which is shorter; color somewhat lighter, more reddish; skull larger; rostrum longer; nasals longer; braincase more vaulted; pterygoid fossae circular as opposed to subcircular; auditory bullae less inflated laterally but more inflated ventrally. For comparisons with _Dipodomys ordii columbianus_, _D. o. fetosus_, _D. o. marshalli_, _D. o. panguitchensis_ and _D. o. cineraceus_ see accounts of those subspecies. _Remarks._--The systematic status of _D. o. utahensis_ has long been in doubt. Several workers have, at various times, considered it to be indistinguishable from _Dipodomys ordii columbianus_. Durrant and Setzer (1945:29) recognized it as a valid subspecies and gave diagnostic characters by which it could be distinguished from _D. o. columbianus_.