DUCKS, GEESE, AND SWANS 59 



150. Aythya coUaris {Bonov.). Reng-necked Duck. 



Bill narrower than in ^l.'marila, black, crossed by blue band near end. 

 Adult male : head, except small white triangle on chin, black, glossed 

 with rich purple ; neck encircled by narrow chestnut collar ; chest and 

 back black, back glossed with greenish ; wings blackish, with blue gray 

 speculum ; middle of belly butf y white ; sides and buck finely verniiculated 

 g-ray; crissum black. Adult ftmale: throat and face whitish, rest of 

 head, neck, and upper parts dull brown ; wing- with blue gray speculum 

 as in male ; chest and sides fulvous, belly white. Length : 15.50-18.00, 

 wing 8.00, bill 1.75-2.00. 



Distribution. — North America, south in winter to Guatemala, breeding 

 from Minnesota and North Dakota northward. 



Nest and eggs as in affinis. 



In habits, as well as in general appearance, the ring-neck is very 

 similar to the lesser scaup. At a little distance they are indistin- 

 guishable, either on the wing or on the water. 



GENUS CLANGULA. 



General Characters. — Bill short, high at base and narrowed toward end ; 

 head with wide, high crest ; males with head g-reen and large white spot 

 at base of bill ; females with head and crest plain brownish, 



KEY TO ADULT MALES. 



1. White patch on cheek, circular americaua, p. 59, 



1'. White patch on cheek, triangular islaudica, p. GO. 



KEY TO FEMALES. 



1. Head light snuff brown americana, p. 5t). 



1'. Head dark umber brown islandica, p. 00. 



151. Clangula clangula americana iBomip.). Amekican 



GOLDEN-EYE. 



Adult male. — Head and crest rich dark greon. :\ rounr! white patch at 

 base of bill ; neck and under parts 

 white ; back black, shoulders white ; 

 wing with white central patch and 

 white stripes on scapulars. Adult 

 female : head and upper neck light 

 snuff brown, neck with wide wliite 

 or gray collar ; Indly white ; chest, 

 sides, and shoulders gray : wing- 

 dusky, with white on coverts ajul 

 secondaries, the white greater cov- 

 erts not tipped with dusky. Nail of 

 bill not over .liO wide. Youiuj male : 

 like female. l)Ut sometimes with a 

 suggestion of the white patch at 

 base of bill, and le.ss gray (»n dwst. 

 Male: length lS..'')0-2;;.()0", wing 0. IS. 

 bill 1,95. Female: iO,.")(), wing 8,14. „. „ 



biU 1,64. ^ 



Distribution.— North America, bn-.-chng m the nortlu-rn rnit.<i ^t;ites 

 and northward ; south in winter to Cuba and Mexico. 



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