1926] Swarth: Birds and Mammals from the Atlin Region 89

Labrador birds are much more grayish than are those from Alaska.
Thus the Labrador willow ptarmigan (wngavus) and the British
Columbia bird (albus) are much alike as regards color but differ in
size of bill. The Labrador bird and the northern Alaskan bird
(alascensis) are both large-billed forms, but differ in coloration.

As regards the ranges of the several North American subspecies of
Lagopus lagopus, it is not feasible at this time to indicate them with
exactness. Series of birds from the Kowak River, Alaska, and from
points on the Yukon as far upstream as Forty-mile, Yukon Territory,

Fig. H. Bills of willow ptarmigan; adult males. a, Lagopus lagopus ungavus,
coll. United States National Museum, no. 101037, Fort Chimo, Ungava; }, L. 1.
alascensis, M.V.Z. no. 32125, Kowak River delta, Alaska; c, L. |. albus, M.V.Z.
no. 44681, Atlin, British Columbia; d, L. 1. albus, United States Biological
Survey, no. 167057, 75 miles north of York Factory, Hudson Bay; e, L. l.
alexandrae, M.V.Z. no. 319, Baranof Island, Alaska.

belong to alascensis. A winter bird from a point 250 miles north of
Edmonton, Alberta, is of the small-billed form, albus. Specimens
collected by Brooks near Log Cabin, on the east side of White Pass,
are albus.

Lagopus l. alexandrae is probably confined mostly to an island
habitat, with perhaps a narrow strip of the adjacent mainland included,
from Glacier Bay south to central British Columbia, at least as far as
Campania Island. The series of alexandrae at hand shows some varia-
tion that may be correlated with distribution. Willett’s specimens are
all from Dall, Prince of Wales, and San Juan islands, in the southern
portion of the habitat of the subspecies, and some of these, together