SCOTER; SEA COOT; BUTTER-BILL. 



163. Oidemia americana. 19 in. 



Male wholly black. Enlarged base of bill 

 yellow. Iris brown. Female plain brownish- 

 black, lighter below. 



Note. Musical whistles. 



Nest. On the ground. Eggs creamy-buff. 



Range. Breeds from Newfoundland and 

 Hudson Bay northward. Winters on the 

 Great Lakes and Atlantic coast of the U. S. 



WHITE-WINGED SCOTER. 

 165. Oidemia deglandi. 22 in. 



Male wholly black but with broad white 

 wing bars and narrow line back of eye. Fe- 

 male blackish-brown but with wing patch. 



Nest. Of down, concealed in grass on the 

 ground. Five to eight buffy eggs. 



Range. Breeds northward from Quebec 

 and N. Dak. Winters in the Great Lakes 

 and on both coasts of the U. S. Often con- 

 gregates in immense flocks known to gun- 

 ners as "rafts," floating well off shore. 

 48 



