1926] Swarth: Birds and Mammals from the Atlin Region 149

Eutamias minimus caniceps Osgood. Gray-headed Chipmunk

Nine specimens collected (nos. 34410-34418), all adult. Chipmunks
were seen about Carcross, and they were fairly common in the lowlands
of the Atlin region. In the town they came familiarly about barns and
in the gardens.

Sciurus hudsonicus hudsonicus (Erxleben)
Northern Red Squirrel

Six specimens collected (nos. 34404-34409), all adults that are
entirely or mostly in summer pelage. In this small series there is
rather notable variation from grayish to reddish extremes; the reddish
specimens may be taken to illustrate intergradation by individual
variation toward S. h. petulans of the nearby Alaskan coast.

Red squirrels are fairly common and of general distribution
throughout the wooded parts of the region.

Castor canadensis canadensis Kuhl. Beaver

Beaver have little chance of survival anywhere near human habita-
tions unless accorded rigid protection, and throughout such parts
of the Atlin region as we visited trapping had reduced their num-
bers to the vanishing point. On the evening of September 9 I spent
an hour or more watching a pair of beavers in a pond a few miles
north of the British Columbia-Yukon boundary, on the trail to Lake
Teslin. They were then actively engaged in laying away winter stores,
in the shape of willow cuttings, and trip after trip, with monotonous
regularity, was made by the laboring animals, across the pond to the
growing willows, and back to the house again, where entrance was
effected by diving.

Peromyscus maniculatus borealis Mearns
Northern White-footed Mouse

Thirteen specimens were collected (nos. 34419-34431), twelve from
the vicinity of Atlin, and one from lower Otter Creek. White-footed
mice were about as scarce as the other small rodents of the region, and
even this small series was acquired, usually one specimen at a time, at
long intervals through the summer.