=Nebraska=: _Sioux County_: Warbonnet Canyon, 6 (MHS); Glen, 1 (MHS); Agate, 3 (1 UM; 2 CNHM); Jim Creek, 1 (MHS). _Box Butte County_: 16 mi. NE Alliance, 4 (UM). _Sheridan County_: 12 mi. S Gordon, 3 (MVZ); 5 mi. N Antioch, 4 (UM); 4 mi. N Antioch, 3 (UM). _Cherry County_: Valentine, 9 (6 USBS; 2 USNM; 1 NU); 15 mi. E Gordon, 1 (CNHM); Niobrara River, 3 (USBS); 18 mi. NW Kennedy, 3 (2 USBS; 1 MHS); Valentine Lake Refuge, 1 (NU); Kennedy, 10 (3 MVZ; 5 USBS; 2 USNM); 30 mi. S Wood Lake, 4 (CNHM); Cherry, 7 (NU); near Clark's Canyon, 7 (USBS). _Rock County_: Perch, 12 (10 AMNH; 2 CNHM). _Antelope County_: Neligh, 8 (1 USBS; 7 MHS). _Scotts Bluff County_: Mitchell, 1 (MHS). _Hooker County_: Kelso, 5 (UM). _Thomas County_: Halsey, 1 (MHS); Dismal River, 2 (USBS). _Custer County_: 1 mi. NW Gavin, 6 (2 MVZ; 4 UM); Gavin, 3 (UM); 8 mi. NW Anselmo, 1 (UM); 7 mi. NW Anselmo, 1 (UM). _Lincoln County_: Birdwood Creek, 2 (USBS); Brady, 4 (NU); Hackberry Lake, 13 (UM). =Colorado=: _Larimer County_: Loveland, 8 (USBS). _Weld County_: 20 mi. E Avalo, 3 (USBS); 8 mi. E Pawnee Buttes, 1 (USBS); Greeley, 1 (USBS). _Morgan County_: 30 mi. S Fort Morgan, 1 (UM). _Logan County_: Sterling, 8 (USBS). _Adams County_: Barr Lake, 4 (CMNH); 6 mi. E and 1 mi. N Denver, 1 (CMNH); 3 mi. NE Fitzsimons, 1 (CMNH). _Washington County_: Akron, 2 (UM). _Lincoln County_: Limon, 1 (USBS); Hugo, 1 (USBS). _El Paso County_: Colorado Springs, 2 (MVZ). =Dipodomys ordii extractus= new subspecies _Type._--Male, adult, no. 76562, Museum of Vertebrate Zoology, University of California; 1 mi. E Samalayuca, 4500 ft., Chihuahua, Mexico; obtained on May 15, 1937, by William B. Richardson, original no. 2148. _Range._--Known only from the type locality. _Diagnosis._--Size medium (see measurements). Color pale, entire dorsal surface Pinkish Buff, purest on sides and flanks, dorsal surface but slightly suffused with black; pinnae of ears, plantar surfaces of hind feet, dorsal and ventral stripes of tail light-brownish. Skull medium in size; nasals long; rostrum relatively as well as actually wide; least interorbital breadth wide; auditory bullae relatively little inflated; braincase but slightly vaulted; external auditory meatus ovoid; zygomatic arches relatively robust and but slightly bowed laterad; pterygoid fossae subcircular; lacrimal processes small; foramen magnum deeply notched on dorsal border. _Comparisons._--From _Dipodomys ordii ordii_, _D. o. extractus_ differs as follows: Size larger; color lighter; arietiform marks absent in _D. o. extractus_ but pronounced in _D. o. ordii_; skull larger; rostrum wider; nasals longer; re inflated laterally; braincase less vaulted; pterygoid fossae subcircular as opposed to circular; foramen magnum more deeply evaginated dorsally and ventrally.