18 KEY TO DUCKS, GEESE AND SWANS OF NORTH AMERICA 



Head, mostly white, greenish on lores and occiput. 



Head, light brown; belly, clear, sooty brown. 



Stellers' Duck. 



Eniconetta stelleri (male). 

 See page 73. 



Stellers' Duck. 



Eniconetta stelleri {female). 

 See page 73. 



GROUP III. 

 Birds having wings from 7.5O to 8.50 inches long. 



Section I. Bill narrow with tooth=like serrations. 



Head, brownish or grayish, tarsus less than 1.50; crest 

 small (female and immature). 

 •-J5, Hooded Merganser. 



Lophodytes cucullatus. 

 LophodyteB cucullatus. See page 39. 



Head with black and white crest; tarsus, less than 1.50 (male). 



Hooded rXerganser. 



Lophodytes cucullatus. 

 See page 39. 



Section 2. Bill not narrow, hind toe without menibrane= 

 ous lobe or flap ; a patch of pale blue on shoulder. 



A patch of blue on wing (coverts; ; a white cres- 

 cent on face ; speculum, green. 



Blue=winged Teal. 



Anas discors (male) . 

 See page 48. 



Anas discors. 

 No white crescent on face ; head, speckled ; chin, whitish ; speculum, green. 



Blue^winged Teal. 



Anas discors ( female). 

 See page 48. 



