Territory. A large population was observed along the highway west of the Teslin River; animals were seen for several miles along the road, principally in open coniferous forests where there was little or no underbrush. Alcorn caught several animals near the city dump at Whitehorse. Along the Richardson Highway he observed these ground squirrels almost continuously for approximately ten miles. He comments that the animals appeared to be more numerous in the man-cleared areas along the highway than in "unmolested areas farther back from the highway." Specimens were taken with collecting gun and in rat traps baited with "chewed" rolled oats.

Remarks.—Specimens with worn pelage are conspicuously paler and grayer than those in fresh pelage. Chipmunks in early stages of molt with fresh pelage extending posteriorly to the middle of the dorsal part of the back were taken on June 19, 20, and 22; others in fresh pelage above, except for the hind quarters, were taken on June 15 and on September 2.

Alcorn found this species nowhere abundant; for example, in 187 museum special traps set near Charlie Lake, 5 miles west and 3 miles north of Fort St. John, in British Columbia, he took only one chipmunk.

Remarks.—Some of the specimens taken between Summit Pass and Toad River show evidence of intergradation between the paler and grayer E. m. caniceps and the brighter and browner E. m. borealis. Rand (1944:41) also found evidence of intergradation between these two subspecies in this area.

Along the highway, Alcorn found this species to be somewhat more abundant in the Yukon Territory than in British Columbia. He often found the animals occupying abandoned road camps; seemingly they were more numerous in these areas than in undisturbed natural habitat.

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.

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.

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.