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 {ungmvus) and the British 

 Columbia bird {ailbus) are much alike as regards color but differ in 

 size of bill. The Labrador bird and the northern Alaskan bird 

 {cHoiscensis) are both large-billed forms, but differ in coloration. 



As regards the ranges of the several North American subspecies of 

 Lagopus lagop^is, 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, 



Kg. H. Bills of willow ptarmigan; adult males, a,, Lagopus lagopus ungavus, 

 eoll. United States National Museum, no. 101037, Fort Chimo, Ungava; 6, L. I. 

 alascensis, M.V.Z. no. 32125, Kowak Biver delta, Alaska; c, L. I. alius, M.V.Z. 

 no. 44681, Atlin, British Columbia; d, L. I. albus, United States Biological 

 Survey, no. 167057, 75 miles north of York Factory, Hudson Bay; e, X. I. 

 alexandrae, M.V.Z. no. 319, Baranof Island, Alaska. 



belong to oLascensis. A winter bird from a point 250 miles north of 

 Edmonton, Alberta, is of the small-billed form, alius. Specimens 

 collected by Brooks near Log Cabin, on the east side of White Pass, 

 are albus. 



Lagopus I. (Aexandrae 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 alexandraie 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 



