=California.= _Trinity County_: S. Yolla Bolly Mt., 3[91]; 1/2 mi. S S. Yolla Bolly Mt., 1. _Tehama County_: 2 mi. S S. Yolla Bolly Mt., 1. _Mendocino County_: 6 mi. N Laytonville, 1; Mt. Sanhedrin, 1[87]; Ft. Bragg, 1; Gualala, 1; Point Arena, 5. _Sonoma County_: 2 mi. S and 1 mi. E Stewarts Point, 1; 3 mi. S Stewarts Point P. O., 1; Freestone, 1. _Napa County_: 6 mi. SSW, Napa, 1; 4 mi. N Vallejo, 1. County in question: San Pablo Bay, 1[91]. _Marin County_: 6 mi. W Inverness, 2; 5 mi. W Inverness, 2(1[28]); Point Reyes, 4 (2[91] 1[60], 1[75]); Nicasio, 2 (1[60], 1[75]); Kehoes Ranch, Pierce Point, 1[28]; Drakes Bay, 1[28]; Tomales Point, about 1/2 mi. SW White Gulch, 1; Point Reyes School, 3-3/4 mi. W Inverness, 1; 15 mi. (by road) N San Rafael, 1[52]; Hurley Ranch, 2 mi. W Tomales, 1. No locality more definite than California, 1[7]. =Mustela frenata xanthogenys= Gray Long-tailed Weasel Plates 21, 22, 23, 28, 30, 34, 35 and 36 _Mustela xanthogenys_ Gray, Ann. and Mag. Nat. Hist., 11:118, 1843. _Putorius (Gale) brasiliensis frenatus_, Coues, Fur-bearing animals, p. 142, 1877 (part). _Putorius xanthogenys_, Merriam, N. Amer. Fauna, 11:25, June 30, 1896; Bangs, Proc. New England Zoöl. Club, 1:56, June 9, 1899. _Mustela xanthogenys xanthogenys_, Miller, U. S. Nat. Mus. Bull., 79:99, December 31, 1912. _Mustela frenata xanthogenys_, Hall, Carnegie Instit. Washington Publ. 473:107, November 20, 1936. _Type._--Male, adult, skull and skin; skull no. 197a-43.6.4.55, skin no. 234a-42.11.21.4, British Museum (Nat. Hist.); from the bank of Sacramento River below mouth of Feather River, or from north shore of San Francisco Bay, California; taken in "1837 or 1838"; presented by Captain Edward Belcher. The skull (plate 28) lacks the occiput, the right mandible posterior to m1, and the right pterygoid; the right zygomatic arch is fractured. The teeth are not greatly worn. The skin was originally mounted for exhibition (R. I. Pocock in Litt.) but in 1937 when I saw the skin, it was prepared as a conventional study skin. The skin is in fairly good condition; some hair is missing on the hind quarters and the skin of the tail is torn at one place. _Range._--Altitudinally, less than 600 feet (Fair Oaks); Lower Sonoran and Upper Sonoran life-zones of all but southern end of the San Joaquin Valley, and probably Sacramento Valley, California. See figures 29 and 30 on pages 221 and 314.