_Remarks._--Although comparative material is not available at this writing, descriptions in the literature indicate that this single adult female belongs to the coastal form, _G. s. zaphaeus_. In both color and in cranial and external measurements, this specimen appears to agree closely with descriptions given by Howell (1918:43) and by Cowan (1937:78 and 82), although its measurements are also in the range of those given for _G. s. alpinus_ by Cowan (_loc. cit._). It may be pointed out that Swarth (1936:402) regarded a specimen from 15 miles south of Atlin, British Columbia, as _G. s. alpinus_. Measurements of Alcorn's specimen are as follows: total length, 331; tail, 143; hind foot, 42; ear from notch, 23; greatest length of skull, 41.7; zygomatic breadth, 25.7; mastoid breadth, 21.7; length of nasals, 12.2; length maxillary tooth-row, 8.2; interorbital constriction, 8.2; and postorbital constriction, 9.0. Castor canadensis sagittatus Benson Beaver _Castor canadensis sagittatus_ Benson, Jour. Mamm., 14:320, November 13, 1933. (Type from Indianpoint Creek, 3200 ft., 16 mi. NE Barkerville, British Columbia.) _Specimens examined._--Two from _British Columbia_: Fort Halkett, N side Liard River. _Remarks._--Two beaver skulls obtained by Alcorn from trapper Johnny Pie appear to be of this subspecies. Anderson (1947:133) records this subspecies from the Liard River, in the area from which these specimens were taken. The trapper told Alcorn that he shot these two beavers in the winter of 1947-48 and hung the skulls in a tree. Peromyscus maniculatus algidus Osgood White-footed Mouse _Peromyscus maniculatus algidus_ Osgood, N. Amer. Fauna, No. 28:56, April 17, 1909. (Type from head of Lake Bennett, site of old Bennett City, British Columbia.) _Specimens examined._--Total 93, as follows: _Alaska_: E side Chilkat River, 100 ft., 9 mi. W and 4 mi. N Haines, 20; 1 mi. W Haines, 5 ft., 7. _Yukon Territory_: 6 mi. SW Kluane, 2550 ft., 10; McIntyre Creek, 2250 ft., 3 mi. NW Whitehorse, 6; 2 mi. NNW Whitehorse, 2100 ft., 2; W side Lewes River, 2150 ft., 2 mi. S Whitehorse, 16; SW end Dezadeash Lake, 9; 1½ mi. S and 3 mi. E Dalton Post, 15. _British Columbia_: Stonehouse Creek, 5½ mi. W jct. Stonehouse Creek and Kelsall River, 8. _Remarks._--Specimens from the localities listed above are in the geographic range of _P. m. algidus_ as outlined by Anderson (1947: 136). Specimens from the vicinity of Haines, Alaska, are slightly darker indicating intergradation with _P. m. hylaeus_; Osgood (1909a: 54 and 56) also noted that intergradation between _P. m. algidus_ and _P. m. hylaeus_ occurs in this area. Peromyscus maniculatus borealis Mearns White-footed Mouse _Peromyscus maniculatus borealis_ Mearns, Proc. Biol. Soc. Washington, 24:102, May 15, 1911. Substitute name for _P. m. arcticus_ Mearns. (Type from Fort Simpson, Mackenzie, Canada.)