=Wyoming=: _Yellowstone Park_, 2. Park Co.: 16-1/4 mi. N and 17 mi. W Cody, 5,625 ft., 2. _Teton Co._: 1 mi. E and 1/4 mi. N Togwotee Pass, 9,800 ft., 2; Amphitheatre Lake, Teton Park, 1 MM; Flat Creek, 4 MM; head of Cache Creek, 4 MM; Jackson, Upper Arizona Creek, 2 MM; Flat Creek-Granite Creek divide, 6 MM; Flat Creek Pass, 1 MM; Flat Creek-Gravel Creek divide, 2 MM. _Lincoln Co._: La Barge Creek, 9,000 ft., 2 BS. _Fremont Co._: Togwotee Pass, 12; 12 mi. N and 3 mi. W Shoshoni, 4,650 ft., 1; Mosquito Park R. S., 9,500 ft., 17-1/2 mi. W and 2-1/2 mi. N Lander, 1; 17 mi. S and 6-1/2 mi. W Lander, 8,450 ft., 3. _Sublette Co._: 31 mi. N Pinedale, 8,025 ft., 2; W side Barbara Lake, 10,300 ft., 8 mi. S and 3 mi. W Fremont Peak, 4; 19 mi. W and 2 mi. S Big Piney, 7,700 ft., 5. =Eutamias umbrinus montanus= new subspecies _Type._--Male, adult, skull, skin, and baculum, No. 20105 Univ. Kansas Mus. Nat. Hist.; from 1/2 mi. E and 3 mi. S Ward, 9,400 ft., Boulder County, Colorado; obtained on August 1, 1947, by E. L. Cockrum; original No. 721. _Diagnosis._--Size large; sides Clay Color; antipalmar and antiplantar surfaces of feet Cinnamon-Buff; baculum as in E. u. umbrinus. _Description._--_Color pattern_: Crown Raw Sienna mixed with gray; upper facial stripe and ocular stripe black mixed with Sepia; submalar stripe Snuff Brown mixed with black; ear black or Sepia, anterior margin Ochraceous-Tawny, posterior margin and postauricular patch grayish white; hairs inside posterior part of pinna Cinnamon-Buff; median dorsal dark stripe black with Sayal Brown along margins; lateral dark stripes black mixed with Sayal Brown; outermost dorsal dark stripes obsolete, Sayal Brown mixed with black; median pair of dorsal light stripes Pale Smoke Gray mixed with Clay Color; outer pair of dorsal light stripes creamy white; sides Clay Color; rump and thighs Neutral Gray; dorsal surface of tail black mixed with Cinnamon-Buff; ventral surface of tail Ochraceous-Tawny; hairs around margin of tail Cinnamon-Buff or Ochraceous-Tawny; antipalmar and antiplantar surfaces of feet Cinnamon-Buff; underparts creamy white with dark underfur. _Skull_: Large; zygomata strong; braincase well inflated. _Baculum_: As in _E. u. umbrinus_. _Comparisons._--From _E. quadrivittatus quadrivittatus_, the subspecies and species to the south, _E. u. montanus_ differs in: General tone of upper parts darker; braincase significantly narrower; baculum shorter and markedly wider at base. From _E. u. umbrinus_, the subspecies from the Uinta and northern Wasatch Mountains, _E. u. montanus_ differs in: General tone of upper parts brighter (less tawny); sides more tawny; skull slightly larger.