BROOKS: BIRDS FROM EAST SIBERIA AND ARCTIC ALASKA. 393 
HISTRIONICUS HISTRIONICUS PACIFICUS, subsp. nov. 
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; tarsus39 ; culmen 27. 
Poe eMmales yf EG. noe dasaaiee 
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, 1918, 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 Swainson. 
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 dixon? 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. 
