_Specimens examined._--Total number, 6, arranged by localities from north to south, and in the Museum of Vertebrate Zoölogy, University of California.
=Alaska.= Chichagof Island, Freshwater Bay, 1. Baranof Island, Saook Bay, 5.
_Mustela erminea celenda_ Hall, Proc. Biol. Soc. Washington, 57:38, June 28, 1944; Hall, Journ. Mamm., 26:181, July 19, 1945.
_Type._--Male, adult, skull and skin; no. 130987, U. S. Nat. Mus., Biol. Surv. Coll.; Kasaan Bay, Prince of Wales Island, Alaska; June 16, 1903; obtained by Cyrus Catt; original no. 4407X.
The skull has a piece 1.5 mm. long broken out of the left zygomatic arch. P2 is absent on both sides. The right I1, and the left I1 and I2 are missing. The skin, in summer pelage, is fairly well made. A scrotal pouch attests to the correctness of the sex recorded on the label. The rostral part of the skull is smaller than in average-sized males of corresponding age.
_Range._--Prince of Wales, Dall, and Long islands, Alaska. See figures 25, 26 on pages 95, 134.
_Characters for ready recognition_ (only males known).--Differs from _M. e. alascensis_ and _initis_ in chest mostly covered by brown patch, not white, and breadth of rostrum measured across lacrimal processes more than a third of basilar length, which cranial character serves to distinguish also _salva_; from _M. e. seclusa_ in zygomatic breadth less than distance between last upper molar and jugular foramen; from _M. e. haidarum_ in chest white (not mostly covered by brown patch), proximal two-thirds of underside of tail colored like upper parts rather than underparts, basilar length more than 38.2 mm.
_Description._--_Size._--Male: Seven adults and subadults from Prince of Wales Island, yield average and extreme measurements as follows: Total length, 286 (277-304); length of tail, 77 (74-85); length of hind foot, 36 (35.5-40.5).
_Color._--As described in _Mustela erminea richardsonii_ except that upper parts about tone 3 of dark Chocolate Brown of Oberthür and Dauthenay, pl. 342; lower throat and chest covered by a large patch of same color as upper parts; color of underparts extending to toes but in interrupted fashion on both fore-and hind-feet; least width of color of underparts averaging, in four males from Prince of Wales Island, 41 (38-49) per cent of greatest width of color of upper parts. Black tip of tail averaging, in 8 males in winter pelage, 65 (59-78) mm. which is 84 (69-92) per cent of length of tail-vertebrae.