_Description._--_Color pattern_: Crown Pinkish Buff mixed with grayish white; facial stripes Snuff Brown mixed with black; anterior margin of ear Drab washed with Cinnamon; hairs inside posterior part of pinna Light Pinkish Cinnamon; posterior margin of ear and postauricular patch grayish white; median dorsal dark stripe black with Sayal Brown along margins; lateral pair of dark stripes Sayal Brown more or less mixed with Fuscous; pairs of light dorsal stripes grayish white and tinged with Buff; rump and thighs Smoke Gray; dorsal surface of tail Fuscous Black mixed with Cinnamon Buff; ventral surface of tail Sayal Brown or Clay Color, Blackish Brown mixed with Cinnamon Buff around margins; antiplantar and antipalmar surfaces of feet Pale Pinkish Buff; underparts creamy white. _Skull_ and _Baculum_: Small but proportionally the same as in other subspecies of _E. minimus_. _Comparisons._--From _E. m. consobrinus_, the subspecies to the west and south, _E. m. minimus_ differs in: Over-all tone of upper parts lighter; underside of tail lighter. From _E. m. pallidus_, the subspecies to the north and northeast, _E. m. minimus_ differs in: Size smaller; skull shorter and narrower; mandible shorter and shallower; baculum shorter; slightly paler. From _E. m. confinis_, the subspecies in the Big Horn Mountains, _E. m. minimus_ differs in: Size smaller; skull shorter and narrower; mandible shorter and shallower; baculum shorter; paler. From _E. m. operarius_, the subspecies to the east and southeast, _E. m. minimus_ differs in: Size smaller; skull shorter and narrower; mandible shorter and shallower; baculum shorter; paler. _Remarks._--_E. m. minimus_ is the smallest of the chipmunks that occur in Wyoming. This pale little squirrel is found in the Red Desert in Sweetwater County, where the features distinctive of the subspecies are most strongly developed. Specimens from western Sweetwater County and northwestern Uinta County are intergrades between _E. m. minimus_ and _E. m. consobrinus_ and are referable to _E. m. minimus_. _Specimens examined._--Total number 167. _Sublette Co._: 60 mi. SE Jackson [Teton County], 1 (MM); 2 mi. SE Big Sandy, 1. _Fremont Co._: 40 mi. E Dubois, 1; 12 mi. N and 3 mi. W Shoshoni, 4,650 ft., 2; 9 mi. N and 3 mi. E Shoshoni, 4,700 ft., 2; 7 mi. N and 3 mi. E Shoshoni, 4,700 ft., 3; 2-1/2 mi. W Shoshoni, 4,800 ft., 1; Granite Mountains, 6; Mount Crooks, 8,600 ft., 6. _Natrona Co._: 27 mi. N and 1 mi. E Powder River, 6,075 ft., 2; 15 mi. N and 1 mi. W Waltman, 1; 9 mi. S and 9 mi. W Waltman, 6,950 ft., 1; 16 mi. S and 11 mi. W Waltman, 6,950 ft., 2; Sun Ranch, 5 mi. W Independence Rock, 6,000 ft., 4; 9 mi. W and 1 mi. N Independence Rock, 1; 5 mi. W and 1 mi. S Independence Rock, 2.