In most places where _E. minimus_ and _E. amoenus_ occur together they can be distinguished without recourse to the baculum, but at Banff and Canmore in western Alberta, recourse to the baculum is almost necessary. There, as elsewhere, they can be distinguished readily by the shape of the bacula. _Specimens examined_: 72. _Eutamias minimus borealis_: Alberta: Canmore, 1 (BS). _E. m. cacodemus_: South Dakota: _Shannon Co._: Quinn's Draw, Cheyenne River, 1 (NM); 14 mi. N and 5 mi. W Rockyford, 3,200 ft., 1. _E. m. confinis_: Wyoming: _Big Horn Co._: 17 mi. E and 3 mi. S Shell, 9,000 ft., 1; 9 mi. E and 9 mi. N Tensleep, 8,200 ft., 1. _Washakie Co._: 9 mi. E and 4 mi. N Tensleep, 7,000 ft., 1. _E. m. consobrinus_: Montana: _Madison Co._: 26 mi. NW West Yellowstone, 6,100 ft., 1. Wyoming: _Sublette Co._: 5 mi. E and 9 mi. N Pinedale, 9,100 ft., 2. _Uinta Co._: 10 mi. S and 1 mi. W Robertson, 8,700 ft., 1; 13 mi. S and 2 mi. E Robertson, 9,200 ft., 2. Utah: _Uintah Co._: Paradise Park, 21 mi. W and 15 mi. N Vernal, 10,050 ft., 8. Colorado: _Jackson Co._: 9-1/2 mi. W and 2 mi. N Walden, 8,400 ft., 1. _E. m. jacksoni_: Michigan: _Menominee Co._: 7 mi. E Stephenson, 4 (MM). Wisconsin: _Juneau Co._: Camp Douglas, 1 (NM). _E. m. minimus_: Wyoming: _Natrona Co._: 27 mi. N and 1 mi. E Powder River, 6,075 ft., 1; 16 mi. S and 11 mi. W Waltman, 6,950 ft., 1; Sun Ranch, 5 mi. W Independence Rock, 6,000 ft., 1. _Uinta Co._: 8-1/2 mi. W Ft. Bridger, 7,100 ft., 1; 2 mi. W Ft. Bridger, 6,700 ft., 1; unspecified, 3 (MM). _Sweetwater Co._: Kinney Ranch, 21 mi. S Bitter Creek, 6,800 ft., 1; 32 mi. S and 22 mi. E Rock Springs, 7,025 ft., 3; 33 mi. S Bitter Creek, 1. _E. m. operarius_: Wyoming: _Converse Co._: 21-1/2 mi. S and 24-1/2 mi. W Douglas, 1. _Carbon Co._: 8 mi. N and 19-1/2 mi. E Savery, 8,800 ft., 1; 5 mi. N and 5 mi. E Savery, 6,900 ft., 1. _Albany Co._: 3 mi. ESE Browns Peak, 10,000 ft., 1. Colorado: _Rocky Mountain National Park_, 1 (MM). _Boulder Co._: Unspecified, 1 (NM). _Gunnison Co._: 7 mi. S and 7 mi. W Gunnison, 8,150 ft., 1. _Saguache Co._: 5 mi. N and 22 mi. W Saguache, 10,000 ft., 2. _Archuleta Co._: Unspecified, 1 (MM); 5 mi. S and 25 mi. W Antonito, 9,600 ft., 3. _Costilla Co._: Unspecified, 1 (MM). New Mexico: _Taos Co._: 23 mi. S and 6 mi. E Taos, 8,750 ft., 3. _E. m. pallidus_: Montana: _Fergus Co._: Unspecified, 1 (MM). _Sweetgrass Co._: Unspecified, 1 (MM). Wyoming: _Campbell Co._: 4 mi. S and 3 mi. W Rockypoint, 1; Ivy Creek, 8 mi. W and 5 mi. N Spotted Horse, 3; Middle Butte, 6,010 ft., 38 mi. S and 19 mi. W Gillette, 1. _E. m. silvaticus_: South Dakota: _Pennington Co._: Unspecified, 1 (MM). _Custer Co._: Unspecified, 2 (MM). Wyoming: _Weston Co._: 1-1/2 mi. E Buckhorn, 6,150 ft., 3. #Eutamias townsendii# (Bachman) Figure 3