=Montana.= _Glacier? County_: Chief Mt. Lake (= Waterton Lake), 1. _Flathead County_: Columbia Falls, 1. _Chouteau? County_: Highwood Mts., 1. _Fergus? County_: Big Snowy Mts., 1. _Wheatland County_: Harlowton, 1[74]. _Ravalli County_: Florence, 2; Hamilton, 1[56]; Darby, 1[56]; Carlos [= Charlos] Heights, 2[74]; Tin Cup District, 2[74]; no locality more definite than county, 2[74]. _Beaverhead County_: Donovan, 1. _Madison County_: Sheridan, 1[74]. _Gallatin County_: Ranch 7-11, Eldridge, 1[60]. _Stillwater County_: Tacy, 2[76]. _County_ in question: Gallatin Valley, 1; Yellowstone Park, 1[75]. =Wyoming.= Glen Creek, Mammoth Hot Springs, 1. _Park County_: Four Bears, 1[2]. =Mustela frenata alleni= (Merriam) Long-tailed Weasel Plates 18, 19, 20, 31, 32 and 33 _Putorius alleni_ Merriam, N. Amer. Fauna, 11:24, June 30, 1896. _Mustela alleni_, Miller, U. S. Nat. Mus. Bull., 79:99, December 31, 1912. _Mustela frenata alleni_, Hall, Carnegie Instit. Washington Publ. 473:106, November 20, 1936. _Type._--Male, adult, skull and skin; no. 186451, U. S. Nat. Mus. (formerly 4485/5120, collection of Dr. C. Hart Merriam); Custer, South Dakota; obtained by Vernon Bailey; original no. 90. The skull is complete and unbroken. The upper incisors are missing. All the other teeth are present although the premolars, and especially the canines, are much worn, possibly as the result of the animal's efforts to free itself from a trap. The skin is fairly well made, in a good state of preservation, and entire. _Range._--Canadian, Transition and Upper Sonoran life-zones of the Black Hills of South Dakota and adjacent semi-bad-land territory of Wyoming and Nebraska southward to Mitchell, Scottsbluff County. See figure 29 on page 221. _Characters for ready recognition._--Differs from _M. f. longicauda_ in smaller size, adult males having a total length of less than 400, hind foot less than 45, basilar length less than 43.5, and in adult females total length less than 375, and basilar length less than 40; from _M. f. nevadensis_ in near Clay Color rather than near (14 _n_ to _l_) Brussels Brown of upper parts in summer. _Description._--_Size._--Male: External measurements of the type specimen are: Total length, 372; length of tail, 137; length of hind foot, 44. Tail is 58 per cent as long as head and body. Length of hind foot more than basal length. Female: No external measurements for typical adults are available. No. M1 #41 from Mitchell, Scottsbluff Co., Nebraska, an adult female which is an intergrade with the larger _M. f. longicauda_, measures as follows: Total length, 367; length of tail, 120; length of hind foot, 41.