248 The Ottawa Naturalist. [February 



35 49 Nail small, holding only the middle of the tip of bill, 



36 37 Rectrices very narrow, pointed and stiff, 18 in number. 



Erismatiira Jamaicensis (Gmel.) Sal v. Ruddy Duck. 



Rectrices softer. 



Of small size, less than 20 inches. 



Bill keel hollow, slightly enlarged towards tip; nail \ to 

 y^ of an inch. 



40 41 Speculum white, bill blue. About 16 inches. 



Aythya affinis (Eyt.) Stepn. Lesser Scaup Duck. Blue- 

 bill. 



41 40 Speculum gray ash, About 18 inches. 



Aythya collaris {Donow .^ '^\d,^\N . Ring-necked Duck, ^ 



42 39 Bill keel round and smooth, equally broad throughout, 



blue, with a very small nail. Length 15 inches. 

 Charitonetta alheola (Linn.) Stepu. Buffle-head. Spirit 



Duck. 



43 42 Bill black with above white at base. 18-19 inches. 



Clangula clangula Americana Faxon. American Golden- 

 eve. Whistler. 



44 38 Of large size, 20 to 24 inches. 



45 46 Head and neck black. 



Aythyamarila (Linn.) Boie. American Scaup Duck. Big 

 Black-head. 



46 45 Head and neck rich chestnut or ruddy chestnut. 



47 48 Bill shorter than head (two or less), dull blue with a black 



belt at end. Nostrils within its basal half. 

 Aythya Americana (Eyt.) Baird. Red-head. Pochard. 



48 47 Bill not shorter than head (two and a half or more), 



blackish with nostrils at its middle. 



Aythya Vallisneria (Wils.) Boie. Canvas-back Duck. 



49 35 ^'3^\ very large, larger than \ of an inch, and holding the 



whole of the end of the bill. 



^ I include that Manitoban species, as a few stragfglers may reach 

 the eastern part of the partly wooded prairie in Saskatchewan. 



