brooks: birds from east Siberia and arctic alaska. 393 



HiSTRIONICUS HISTRIONICUS PACIFICUS, Subsp. IIOV. 

 WESTERN HARLEQUIN DUCK. 



Type. — Adult male, no. 66786, M. C. Z. Cape Shipunski, Kam- 

 chatka, collected May 22, 1913, by Joseph Dixon. Orig. no. 3075. 



Characters. — Male Harlequin Ducks from the Pacific differ from 

 Atlantic birds in being larger, with heavier bills, and in the coloration 

 of the crown. In the Pacific bird the chestnut stripes on each side of 

 the crown do not extend so far forward, and the color is not nearly 

 so rich, having a washed-out appearance. The transition from 

 chestnut to white is also much more gradual. 



Measurements. — Type, adult male : wing 208 ; tarsus 39 ; culmen 27. 

 " female: " 185; " 37.5; " 27. 



All Pacific coast specimens appear to be constant in these characters. 

 A male from the Big Horn Mountains, Montana, collection of William 

 Brewster, no. 5666, shows intergradation of color on the crown but is 

 clearly referable to the Pacific form. 



We noted a few of these birds at the following localities : — Semidi 

 Islands, Alaska, April 19, 1913, King Cove, Alaskan Peninsula, April 

 22, 1913, Avatcha Bay, Kamchatka, May 10, 1913, Cape Shipunski, 

 Kamchatka, May 21, 1913, Cape Zhipanov, Kamchatka, May 25, 

 1913, and Providence Bay, Siberia during the first three weeks of 

 June 1913. 



OeDEMIA AMERICANA SwaiuSOU. 

 SCOTER. 



This species was only noted on one occasion, a few being seen at Cape 

 Shipunski, May 22, 1913. 



Oedemia deglandi dixoni, subsp. nov. 

 dixon's white-winged scoter. 



Type.— Adult male, no. 66787 M. C. Z. Humphrey Point, Arctic 

 Alaska, collected June 13, 1914, by Joseph Dixon. Orig. no. 3697. 



Characters. — Similar to deglandi, with the exception of the size 

 and shape of bill, which in dixoni is shorter and broader in proportion 

 to its length and more blunt at the tip, with the angles from its greatest 

 width to the tip more abrupt. 



