=Utah=: _Rich Co._: Monte Cristo, 18 mi. W Woodruff, 8,000 ft., 2 UU. _Summit Co._: 13-1/2 mi. S and 2 mi. E Robertson [Wyoming], 4; 1 mi. N Bridger Lake R. S., 9,400 ft., 4. _Wasatch Co._: Snake Creek Canyon, 3 mi. NW Midway, 6,000 ft., 1 UU. _Uintah Co._: Paradise Park, 21 mi. W and 15 mi. N Vernal, 10,050 ft., 20. =Eutamias umbrinus adsitus= J. A. Allen _Eutamias adsitus_ J. A. Allen, Brooklyn Institute Mus. Sci. Bull. 1:118, March 31, 1905. _Type._--Unsexed adult, skull and skin, No. 28728 Amer. Mus. Nat. Hist.; from Briggs Meadow, 10,000 ft., Beaver Mountains, Utah; obtained on August 20, 1904, by George P. Engelhardt. _Diagnosis._--Size medium; sides dark; general tone of upper parts dark; dorsal light and dark stripes strongly contrasting. _Description._--_Color pattern_: Head Cinnamon mixed with grayish white; stripe on margin of crown Verona-Brown or Bister; ocular stripe Fuscous Black mixed with Sayal Brown; submalar stripe Sayal Brown; ear Fuscous, Sayal Brown along anterior margin and Smoke Gray along posterior margin and on postauricular patch; median dorsal stripe black; lateral dorsal dark stripes Fuscous Black mixed with Russet; outermost dorsal dark stripes slightly darker or indistinguishable from sides in color; dorsal light stripes grayish white with Mikado-Brown along margins; outermost pair of dorsal light stripes nearly pure white; sides Russet mixed with Cinnamon or Ochraceous-Tawny; rump and thighs Smoke Gray mixed with Cinnamon-Buff, with a larger or smaller number of Fuscous Black hairs; antipalmar and antiplantar surfaces of feet Cinnamon-Buff; dorsal surface of tail black; ventral surface of tail Sayal Brown to Tawny; underparts white with dark underfur. _Skull_ and _Baculum_: As in _E. u. umbrinus_. _Comparisons._--From _E. u. inyoensis_, the subspecies to the west, _E. u. adsitus_ differs in: General tone of upper parts darker; sides darker; interorbital region wider; skull significantly deeper. For comparison with _E. u. umbrinus_, _E. u. sedulus_, and _E. u. montanus_, see the accounts of those subspecies. _Remarks._--Specimens from West Rim, Zion National Park, 6,500 ft., Washington County, Utah, seem to be intergrades between _E. u. adsitus_ and _E. u. inyoensis_, and are referable to _E. u. adsitus_. _Specimens examined._--Total number, 34. =Utah=: _Beaver Co._: Britts Meadow, Beaver Range Mountains, 8,500 ft., 13 BS. Wayne Co.: Donkey Lake, Boulder Mountain, 10,000 ft., 4 UU. _Garfield Co._: Wildcat R. S., Boulder Mountain, 8,700 ft., 5 UU. =Arizona=: _Coconino Co._: De Motte Park, Kaibab Plateau, 3 BS; Bright Angel, Kaibab Plateau, 9 BS. =Eutamias umbrinus sedulus= new subspecies