JAN., 1909. BIRDS OF ILLINOIS AND WISCONSIN CORY. 69 



Top of head, black, divided on crown ; more or less green on head ; 



throat, white; axillars, white; bill (culmen), divided and rounded at 

 base (male). (See cut of bill. ) Somateria dresseri. 



American Eider Duck. 

 See No. 61. 



Top of head, black, divided on crown ; more or less green on head ; 

 throat, white; axillars, white; culmen, divided and pointed at base 

 (male ) . (See cut of bill. ) Arctic species ; not recorded from Lake 

 Michigan region. Somateria mollissima borealis. 



Northern Eider Duck. 



Top of head, slate color; cheeks, greenish; throat, white, with 

 large, black, V-shaped mark (male). Somateria spectabilis. 



King Eider Duck. 



See No. 62. 



SECTION 2- Hind toe, with well defined membraneous lobe or flap; 

 no white on head; belly, black. 



General plumage, black ; axillars, black; no 

 white on wing; bill, orange at base; feathers 

 on bill, more than one-half inch from nostril 

 ( male) . Oidemia americana. 



American Scoter. Black Coot. Butter-bill 

 Coot. See No. 63. 



SECTION 3- Hind toe, with well defined membraneous lobe or flap; 

 head, marked with more or less white, or grayish white; belly, 

 mottled brown, or grayish brown, or slaty. 



General plumage, brownish; no white on wing; feathers on bill, 

 more than one-half inch from nostril (female and immature ) . 



Oidemia americana. 

 American Scoter. Butter-bill Coot. 



See No. 63. 



General plumage, grayish brown; speculum, white; feathers on 

 bill, less than one-half inch from nostril (female and immature ) . 



Oidemia deglandi. 



White-winged Scoter. White-winged Coot. 



See No. 64. 



