138 BIRDS. 



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

 *** Lores feathered ; tarsus scutellate in front ; Ducks, 

 f Bill depressed ; the lamellae simple, bluntish. 

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



Ducks." (A^'ATIN^E.) 



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



colors brilliant in $ Aix, 11. 



bb. Bill very much widened towards the tip ; speculum 



green SPATULA, 10. 



bbb. 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. 

 dd. Speculum violet, bordered with black and white. 



ANAS, 4. 



.ddd. Speculum greenish purple, bordered by black, white 

 and buff; 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. 



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



(FtTLIGULLN^E.) 



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



CAMPTOL^EMITS, 16. 

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



and orange HARELDA, 15. 



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

 . - to their bases, the upper coverts being very short. 



ERISMATURA, 20. 



