_Teton Co._: Two Ocean Lake, 2 (1 FC); Whetstone Creek, 8 (MM); Emma Matilda Lake, 1 (FC); Pacific Creek Road, 2-1/2 mi. E Moran, 1 (FC); Two Ocean Lake Road, 2 (FC); 2 mi. E Moran, 1 (FC); 2-1/2 mi. E and 1/4 mi. N Moran, 6,230 ft., 8; Pacific Creek, 1 (MM); junction of Two Ocean Lake Road and U.S. Highway 187, 2 (FC); Signal Mountain Road, 1 (FC); Leigh Lake, 9 (MM); Indian Paint Brush Canyon, Teton Park, 1 (MM); Teton National Park, 3; 3 mi. E and 1/4 mi. S Moran, 6,200 ft., 1; 3-3/4 mi. E and 1 mi. S Moran, 6,200 ft., 8; 2-1/2 mi. N and 3-1/2 mi. E Moran, 7,225 ft., 1; Timbered Island, 6,750 ft., 4 mi. N Moose, 5; Bar BC Ranch, 6,500 ft., 2-1/2 mi. NE Moose, 9; Grand Teton, 9,000 ft., Teton Park, 1 (MM); Upper Arizona Creek, Jackson, 1 (MM). _Lincoln Co._: 3 mi. N and 11 mi. E Alpine, 5,650 ft., 2. _Additional records_ (Howell 1929:69): _Yellowstone Park_: Mammoth Hot Springs; Roaring Mountain; Bunsen Peak; Yancey; Apollinaris Spring; Canyon; Yellowstone Lake; Upper Geyser Basin; Old Faithful. _Park Co._: Near head of Clarks Fork; Pahaska, N Fork Shoshone River at Grinnell Creek; Valley. _Teton Co._: Moran; Teton Mountains; Teton Pass. _Lincoln Co._: Afton, Salt River Mountains; head of La Barge Creek, 9,100 ft.; Salt River Mountains, 10 mi. SE Afton. _Sublette Co._: Merna; Stanley. Eutamias dorsalis (Baird) _Diagnosis._--Size medium to large; general tone of upper parts Smoke Gray; dorsal stripes indistinct or obsolete; often brightly colored at base of tail; keel of baculum proportionally high, approximately 1/3 of length of tip; skull longer than 34.5 mm. _Comparisons._--From _E. umbrinus_, _E. dorsalis_ differs in: Dorsal stripes faint; skull smaller; base of baculum not noticeably expanded; general tone of upper parts grayer. For comparisons with _E. minimus_ and _E. amoenus_ see the accounts of those species. [Illustration: FIG. 2. Known occurrences and probable geographic distribution of _Eutamias amoenus_ and _Eutamias dorsalis_ in Wyoming. See figure 1 for explanation of symbols. 1. _E. amoenus luteiventris_ 2. _E. dorsalis utahensis_] Eutamias dorsalis utahensis Merriam _Eutamias dorsalis utahensis_ Merriam, Proc. Biol. Soc. Washington, 11:210, July 1, 1897. _Type._--Male, adult, skull and skin, No. 186457 (NM); from Ogden, Weber County, Utah; obtained on October 9, 1888, by Vernon Bailey; original No. 289. _Diagnosis._--Size medium; dorsal stripes faint; baculum not noticeably widened at base.