138 BIRDS. 



aa. Bill and legs black ; neck black. . . Bernicla, 3, 



*** Lores feathered ; tarsus sciitellate in front ; Ducks. 



f Bill depressed ; the lamellae simple, bluntish. 



\ Hind toe simple, not bordered by membrane. " River 

 Ducks." (A:sATiN^.) 



h. Head crested ; tip of bill formed entirely by the nail ; 

 colors brilliant in $ Aix, 11, 



6&. Bill very much widened towards the tip ; speculum 

 green. ...... Spatula, 10. 



hhh. Head not crested ; bill not much widened towards, tip. 



c. Tail wedge-shaped, at least f length of wing. 



$ of Dafila, 5. 



cc. Tail less than half length of wing. 



d. Speculum white ; wing coverts chestnut. 



Chaulelasmus, 6. 

 del. Speculum violet, bordered with black and white. 



Anas, 4. 

 ddd. Speculum greenish purple, bordered by black, white 

 and buti; crown streaked; tail feathers acute. 



? of Dafila, 5. 

 dddd. Speculum green. 



e. Wing coverts mostly white; crown whitish. 



Mareca, 7. 



ee. Wing coverts sky blue; head of $ plumbeous or 



purplish. . . . QUERQUEDULA, 8. 



eee. Wing coverts plain ashy ; head of male chestnut 

 with green band. . . . Nettion, 9. 



\X Hind toe lobed (bordered by membrane.) " Sea Ducks." 



(FULIGULIN^.) 



Ti. Cheeks bristly ; colors black and white (or gray.) 



Camptol^ivius, 16. 



hh. Tail pointed, longer than wings (in adult) ; bill black 

 and orange. Harelda, 15. 



lihh. Tail rounded ; the feathers stiff, narrow, exposed nearly 

 to their bases, the upper coverts being very short. 



Erismatura, 20. 



