298 



KEY AND DESCRIPTION 



species is far more common in the interior than on the coast. 



It is the original form of the common domestic duck, and its 



voice is the same quack. (Green- 

 head.) 



Length, 23; wing, 11 (lOJ-12) ; 

 tail, 3i ; tarsus, 1| ; culmen, 2|. 

 Northern hemisphere ; breeding from 

 the Gulf States northward, and win- 

 tering south to Central America. 



30. Black Duck (133. Anas 

 obscura). — A very dark-colored, 

 almost black duck, with a black- 

 bordered rich purple speculum. 

 The head is lighter, the cheeks 

 being a streaky buff. There is 

 no decided white except under 

 the wings, but there are buffy 

 margins to most of the feath- 

 ers. This is more common along 

 the coasts 



Mallard 



than the last, and can always be sepa 

 rated from the female of that species 

 by the lack of white border to the spec- 

 ulum. In habits and voice it is like 

 the mallard. (Dusky Duck ) 



Length, 22 ; wing, 11 

 (10-lli); fail, 3^; tar- 

 sus, If ; culmen, 2 J. 

 Eastern North America 

 west to the Mississippi 

 Valley ; breeding from 

 New Jersey and Illinois 

 to Labrador, and win- 

 tering from the Middle 

 States to Cuba. 



31. Florida Duck 



(134. Anas fulvigula). 



Black Duck 



