_Type._--Male, adult, skull, skin, and baculum, No. 158181 U. S. Nat. Mus. Biol. Surv. Coll.; from Mount Ellen, Henry Mountains, Garfield County, Utah; obtained on October 13, 1908 by W. H. Osgood; original No. 3667. _Diagnosis._--Size medium; general tone of upper parts dark reddish-brown; ventral surface of tail Ochraceous-Orange; sides Mars Yellow. _Description._--_Color pattern_: Crown Drab-Gray mixed with Fuscous; upper facial stripe Fuscous Black mixed with Sudan Brown; ocular stripe Sudan Brown mixed with black; submalar stripe Sudan Brown slightly mixed with black; anterior margin of ear Sudan Brown slightly mixed with black; hairs inside pinna, posteriorly, Warm Buff; posterior margin of ear and postauricular patch creamy white; median dorsal dark stripe black with Antique Brown along margins; lateral dorsal dark stripes black mixed with Antique Brown; outermost dorsal dark stripes Xanthine Orange slightly mixed with black; median dorsal light stripes Pale Smoke Gray; outermost dorsal light stripes white slightly mixed with gray; rump and thighs Smoke Gray; sides Mars Yellow; dorsal surface of tail black mixed with Warm Buff; ventral surface of tail Ochraceous-Orange, with black around margin, and Warm Buff around outermost edge; antipalmar and antiplantar surfaces of feet Ochraceous-Buff; underparts creamy white with dark underfur. _Skull_: Large; braincase moderately inflated; zygomata strong. _Baculum_: As in _E. u. umbrinus_. _Comparisons._--From _E. u. umbrinus_, the subspecies from the Uinta and northern Wasatch Mountains of Utah, _E. u. sedulus_ differs in: General tone of upper parts lighter; sides lighter. From _E. u. adsitus_, the subspecies from the southern Wasatch Range in Utah and Kaibab Plateau in Arizona, _E. u. sedulus_ differs in: Sides lighter; general tone of upper parts markedly lighter. From _E. u. inyoensis_, the subspecies from central and northeastern Nevada, and western and northwestern Utah, _E. u. sedulus_ differs in: Sides lighter (less grayish); general tone of upper parts tawnier. For comparison with _E. u. montanus_, see the account of that subspecies. _Specimens examined._--Total number, 7 BS, all from the type locality. =Eutamias umbrinus inyoensis= Merriam _Eutamias speciosus inyoensis_ Merriam, Proc. Biol. Soc. Washington, 11:202, 208, July 1, 1897. _Type._--Male, adult, skull and skin, No. 29387/41462 U. S. Nat. Mus. Biol. Surv. Coll.; from Black Canyon, 8,200 ft., White Mountains, Inyo County, California; obtained on July 7, 1891, by E. W. Nelson; original No. 1069. _Diagnosis._--Size medium; sides light; general tone of upper parts light; baculum one of largest in species.