_Remarks._--In most subspecies of _Dipodomys ordii_ having large geographic ranges, there is a certain amount of variation, but _D. o. columbianus_ remains relatively stable throughout its large range. Where extreme variation is noted in _D. o. columbianus_ it is obviously the result of intergradation. This intergradation is noted between _Dipodomys ordii monoensis_ and _D. o. columbianus_ in Lyon County, Nevada, where the animals are referable to the former race cranially but to the latter on the basis of color. Animals from Kelton, Utah, are in color as _Dipodomys ordii marshalli_ and cranially combine characters of _D. o. columbianus_, _D. o. utahensis_ and _D. o. marshalli_. The sum total of their characters places them with _D. o. marshalli_. Durrant and Setzer (1945:29), and the present writer in this account, do not record any animals from Utah as belonging to _D. o. columbianus_. Nevertheless, the influence of _D. o. columbianus_ is seen in the animals from Kelton, Utah. _Specimens examined._--Total, 588, distributed as follows: =Washington=: _Benton County_: Blalock Island, 2 mi. SW Paterson, 2 (MVZ). _Walla Walla County_: 4 mi. E Burbank, 4 (MVZ); 2 mi. SSE Burbank, 27 (MVZ); Wallula, 7 (4 MVZ; 3 DRD). =Oregon=: _Gilliam County_: Arlington, 1 (MVZ). Morrow County: 2-1/2 mi. SW Irigon, 6 (MVZ); Cecil, 1 (MVZ). _Umatilla County_: Umatilla, 10 (MVZ). _Jefferson County_: 7 mi. E Madras, 2 (DRD). _Crook County_: 2 mi. NE Prineville, 1 (MVZ); 7 mi. W Prineville, 8 (MVZ); 4 mi. SW Prineville, 23 (MVZ); Crooked River, at mouth of Bear Creek, 8 (MVZ). _Lake County_: Fort Rock, 1 (DRD); NE edge Alkali Lake, 8 (MVZ); 9 mi. S Adel, mouth 20 Mile Creek, 1 (MVZ); Guano Ranch, Guano Valley, 2 (DRD). _Harney County_: Malheur Lake, 9 (LACM); Narrows, 1 (DRD); 1 mi. S Narrows, 3 (MVZ); 5 mi. SW Narrows, 19 (MVZ); Smith Creek, 10 mi. SE Diamond, 1 (MVZ); Lake Alvord, 1 (MVZ); 1-1/2 mi. E Denio, 4 (MVZ). _Malheur County_: 3 mi. N Vale, 2 (MVZ); 8 mi. N Jordan Valley, 1 (MVZ); 1/2 mi. S Rome, 5 (MVZ); 1 mi. S Rome, 11 (MVZ). =Idaho=: _Payette County_: Payette, 1 (DRD). _Butte County_: Arco, 1 (MVZ). _Elmore County_: Hammett, 1 (MVZ). _Bingham County_: 5 mi. E Shelley, 1 (MVZ); Blackfoot, 5 (MVZ); 3 mi. S Blackfoot, 6 (MVZ); Aberdeen, 1 (MVZ). _Owyhee County_: S bank Snake River, Homedale, 13 (MVZ); Indian Cove, 4 (MVZ); 5 mi. SE Murphy, 3 (MVZ); Castle Creek, 8 mi. S Oreana, 1 (MVZ); S Fork Owyhee River, 12 mi. N Nevada line, 1 (MVZ). _Minidoka County_: Acequia, 8 (MVZ); 4 mi. N Rupert, 2 (MVZ). _Twin Falls County_: Salmon Creek, 8 mi. W Rodgerson, 7 (MVZ). _Power County_: 5 mi. NW Michaud, 4 (MVZ); 4 mi. NE American Falls, 4 (MVZ); 6 mi. SW American Falls, 10 (MVZ).