=Utah=: _Tooele County_: Clifton Flat, 7 mi. SW Gold Hill, 6149 ft., 4 (UU); Parrish Ranch, 5 mi. N Ibapah, 5175 ft., 1 (UU); Ibapah, 5000 ft., 23 (UU). _Juab County_: Trout Creek, 4600 ft., 21 (19 UU; 1 USAC; 1 MVZ); 20 mi. SW Nephi, 2 (UU); U. B. (Yuba) Dam, Sevier River, 5000 ft., 10 (UU). _Millard County_: 4 mi. S Gandy, 5000 ft., 1 (MVZ); Smith Creek, 6 mi. S Gandy, 5400 ft., 2 (MVZ); Hendry Creek, 5000 ft., 17 mi. S Gandy, 4 (MVZ); Oak City, 5000 ft., 1 (UU); White Valley, 60 mi. W Delta, 1 (UU); 35 mi. W Delta, 1 (UU); East side Clear Lake, 4600 ft., 4 (3 UU; 1 USAC); 2 mi. E Clear Lake, 4600 ft., 2 (UU). =Dipodomys ordii cineraceus= Goldman _Dipodomys ordii cineraceus_ Goldman, Journ. Mamm., 20:352, August 14, 1939. _Type._--Male, no. 263890, U. S. Nat. Mus. Biol. Surv. Coll.; Dolphin Island, Great Salt Lake, 4250 ft., Box Elder County, Utah; obtained on June 4, 1938, by William H. Marshall, original no. 57. _Range._--Dolphin Island, Great Salt Lake, Utah. _Diagnosis._--Size medium (see measurements). Color pale, upper parts near Pale Pinkish Buff, but lightly washed with black, purest on sides and flanks; arietiform markings, pinnae of ears, plantar surfaces of hind feet, dorsal and ventral stripes of tail, brownish. Skull medium in size; rostrum short; nasals relatively short; interparietal region relatively wide; auditory bullae but slightly inflated. _Comparisons._--From _Dipodomys ordii utahensis_, _D. o. cineraceus_ differs in: Size smaller; color lighter; nasals longer; auditory bullae larger; total length of skull greater. From _Dipodomys ordii marshalli_, _D. o. cineraceus_ differs in: Size smaller; color darker; skull larger in all measurements taken. _Remarks._--The race _D. o. cineraceus_ along with _Dipodomys microps russeolus_ is found on Dolphin Island, Great Salt Lake, Utah. Dolphin Island is connected with the mainland by a bar that could allow animals from the island to disperse onto the mainland. There are no animals from the mainland, however, that are referable to _D. o. cineraceus_ or to _D. m. russeolus_. The animals available from the mainland, at Kelton, although geographically near Dolphin Island, are referable to _D. o. marshalli_ and to _D. m. bonnevillei_. The paucity of material from the mainland, adjacent to Dolphin Island, may be significant. Future trapping in this area is needed before we can be certain that _D. o. cineraceus_ is isolated. _Specimens examined._--Total, 2, both from Utah, as follows: _Box Elder County_: Dolphin Island, Great Salt Lake, 4250 ft., 2 (USNM). =Dipodomys ordii marshalli= Goldman _Dipodomys ordii marshalli_ Goldman, Proc. Biol. Soc. Washington, 50:223, December 28, 1937.