_Remarks._--This race confined to Utah, and inhabiting northern Washington County and most of Iron County, is restricted almost exclusively to areas of loose shifting sand. Intergradation with _Dipodomys ordii fetosus_ occurs near Lund. The animals from this locality intergrade in size of body and in color, but in the majority of cranial characters resemble _D. o. cinderensis_. In all characters studied _D. o. cinderensis_ appears to be more closely related to _Dipodomys ordii utahensis_ than to any other subspecies with which it comes into actual contact. Animals from near Parowan have both cranial and external characters by which they could be referred to either _D. o. panguitchensis_ or _D. o. cinderensis_. Owing to the existence of the physical barrier (Cedar Mountains) separating the two populations, they are referred to _D. o. cinderensis_. _Dipodomys ordii cinderensis_ is not a well differentiated race but appears to possess characters sufficiently diagnostic to distinguish it from contiguous forms. _Specimens examined._--Total, 74, all from Utah, distributed as follows: _Iron County_: 11 mi. SE Lund, 50 (46 RH; 4 MVZ); 4-1/2 mi. NW Summit and 6 mi. W Parowan, 9 (RH); 10 mi. W Cedar City, 1 (USAC); 5 mi. W Cedar City, 1 (USAC); Cedar City, 2 (BYU). _Washington County_: Diamond Valley, 9 (RH); N end Mountain Meadows, 2 (RH). =Dipodomys ordii fetosus= Durrant and Hall _Dipodomys ordii fetosus_ Durrant and Hall, Mammalia, 3:14, March, 1939. _Type._--Female, adult, no. 48451, Museum of Vertebrate Zoology, University of California; 2 mi. N Panaca, 4,800 ft., Lincoln County, Nevada; obtained on June 24, 1931, by Ward C. Russell, original no. 1658. _Range._--Southeastern Nevada and western Beaver and Millard counties, Utah; marginal occurrences in Nevada, 2 mi. SE Pioche, 15 mi. WSW Sunnyside, 16-1/2 mi. WSW Sunnyside, 14 mi. NNE Sharp, 8-1/2 mi. NE Sharp, 15 mi. S Groom Baldy, 10 mi. E Crystal Spring, Panaca; in Utah, Pine Valley, 50 mi. W Milford and 5 mi. S Garrison. _Diagnosis._--Size medium (see measurements). Color dark, entire dorsal surface (_16''_) between Pinkish Cinnamon and Cinnamon-Buff, purest on sides and flanks with strong admixture of black in upper parts; cheeks white; pinnae of ears, arietiform markings, plantar surfaces of hind feet, dorsal and ventral stripes of tail, blackish. Skull medium in size; rostrum wide and short; interorbital region narrow; braincase but slightly vaulted; lacrimal processes large; zygomatic arches weak and bowed laterally; pterygoid fossae large and subcircular.