70 Field Museum of Natural History — Zoology, Vol. TX. 



General plumage, grayish brown; feathers extending on upper 

 part of bill more than on the sides; no white on wing; feathers on 

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



Oidemia perspicillata. 

 Surf Scoter. Skunk-head Coot. 

 See No. 65. 



SECTION 4. Hind toe, with well defined membraneous lobe or flap; 

 no white on head; belly, mottled brown, or grayish brown. 



General plumage, brownish; no white on wings; axillars, black; 

 feathers on the bill, more than one-half inch from nostril (female ) . 



Oidemia americana. 

 American Scoter. Butter-bill Coot. Gray Coot. 



See No. 63. 



Head, dark brown or black; feathers on bill, less than one-half 

 inch from nostril; axillars, black; no white on wings (immature 

 male ) . Oidemia perspicillata. 



Surf Scoter. Skunk-head Coot. 



See No. 65. 



A patch of white on the wings; back and upper parts, dark brown; 

 feathers on the base of bill, extending to within one-half inch of nos- 

 tril (female ) . Oidemia deglandi. 



White-winged Scoter. 

 See No. 64. 



Head, tawny, streaked with brown; axillars, white, or grayish 

 white; throat, streaked; feathers on bill, within one-fourth inch from 

 nostril; decided difference in bill from next species (female). (See 

 cut. ) Eastern North America. Somateria dresseri. 



American Eider Duck. 

 See No. 61. 



Head, tawny, streaked with brown; axillars, white, or grayish 

 white; throat, streaked; feathers on bill, within one-fourth inch 

 from nostril; decided difference in bill from preceding species (fe- 

 male). (See cut.) Eastern North America. This is given for 

 comparison; the species has not yet been recorded from the Lake 

 Michigan region. Som-ateria mollissima borealis. 



Northern Eider Duck. 



