_Remarks._--Trowbridge and Whitaker named this kangaroo rat as a full species. The diagnostic characters were the length and breadth of the rostrum and the relatively great inflation of the auditory bullae. Also, _Dipodomys oklahomae_ was not known to intergrade with any other named kinds. Davis (1942:332) treated _D. oklahomae_ as a subspecies of the earlier named species _Dipodomys ordii_. Certain characters in specimens from the type series of both _D. o. richardsoni_ and _D. oklahomae_, such as the shape and configuration of the nasals, the over-all proportion of the skull, tooth pattern and body proportions through individual variation overlap and indicate that these two groups of animals belong to the same species, even though animals from intermediate geographic areas are not available to show actual intergradation. My findings corroborate Davis' conclusion that _D. oklahomae_ should stand as _Dipodomys ordii oklahomae_. In spite of the great similarities shown by the two groups of animals there are still sufficient diagnostic characters between the two groups to enable them to be segregated easily as valid subspecies. _Dipodomys ordii oklahomae_ is, for some unknown reason, restricted to a limited geographic range. Specimens examined from the upper reaches of the South Canadian River, farther westward, are all referable to _D. o. richardsoni_ rather than, as would be expected, to _D. o. oklahomae_ since the habitat for these animals is continuous from the type locality of _D. o. oklahomae_ to the upper reaches of the South Canadian River. In length and shape of the nasals, degree of inflation of the auditory bullae and width of the interorbital region these specimens from the upper reaches of the South Canadian River are intergrades between _D. o. richardsoni_ and _D. o. medius_. The range of _D. o. medius_ lies to the south of that of _D. o. richardsoni_ and to the southwest of that of _D. o. oklahomae_. The present range of _D. o. oklahomae_, as now understood, is the most eastern part of the range of the species _Dipodomys ordii_ and of the genus _Dipodomys_. The existence of _D. o. oklahomae_ in this area is a precarious one since its habitat is limited in extent and is periodically flooded. Although no specimens are known from the area where intergradation between _D. o. oklahomae_ and _D. o. richardsoni_ would be expected to occur, it would seem that when animals from this region become available, intergradation will be shown to occur. _Specimens examined._--Total, 8, all from Oklahoma, distributed as follows: _Grady County_: 4 mi. N Minco, 1 (USBS). _Cleveland County_: 2-1/4 mi. S Norman, 7 (6 OU; 1 USBS). =Dipodomys ordii compactus= True _Dipodomys compactus_ True, Proc. U. S. Nat. Mus., 11:160, January 5, 1889. _Cricetodipus compactus_, Trouessart, Catalogus Mammalium, 1:581, 1897. _Perodipus compactus_, Elliot, Field Columbian Museum, Zool. Ser., 2:240, 1901.