Jan.. 1909. Birds of Illinois and Wisconsin — Cory. 65 



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

 duskv or grav; no white or grayish white on head. 



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



Clangula clausula 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 Xo. 5,3. 



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 collaris. 

 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 w4ng coverts, not white (male). 



Histrionicus histrionicus . 

 Harlequin Duck. 

 See No. 60. 



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

 mottled on the under parts (female). 



Hist rionicus h ist rionicus . 

 Harlequin Duck. 

 See No. 60. 



