JAN.. 1909. BIRDS OF ILLINOIS AND WISCONSIN CORY. 65 



SECTION 2. Belly, white, sometimes tinged on lower part with 

 dusky or gray; no white or grayish white on head. 



Head, brown; a distinct wing band of white (female). 



Clangula clangula americana. 

 American Golden-eye. 



See No. 56. 



Head, black, glossed with green; speculum, white; back, grayish 

 white, finely lined with black (male). 



Marila marila. 

 Scaup Duck. Bluebill or Blackhead. 



See No. 53. ' 



Head, black, glossed with purple, finely lined with black; specu- 

 lum, white; back, grayish white; smaller than the preceding species, 

 but resembles it closely (male). 



Marila affinis. 



Lesser Scaup Duck. Bluebill or Blackhead. 

 See No. 54. 



Head, black, with violet or bluish gloss, a spot of white on the 

 chin ; speculum, gray ; back, dull black (male ) . 



Marila collar is. 

 Ring-necked Duck. 



See No. 55. 



SECTION 3. Belly, not white. 



Plumage, variously marked with white, slate-color, and chestnut; 

 speculum, bluish; top of head and wing coverts, not white (male). 



Histrionicus histrionicus. 

 Harlequin Duck. 

 See No. 66. 



Top of head and wing coverts, not white; plumage, dull brown, 

 mottled on the under parts (female). 



Histrionicus histrionicus. 

 Harlequin Duck. 

 See No. 60. 



