ANATID^. — LX. 139 



KhKh. Ducks with none of the above peculiarities. 

 i. Upper mandible gibbous at its luifeathered base ; black 



or brown (Edemia, 19. 



ii. Upper mandible not gibbous where unfeathered. 

 j. Nail at tip of bill narrow and distinct. 



A. Head black or brown; nostrils sub -basal; bill 

 longer than tarsus. . . . Fulix, 12. 

 Sft. Head reddish or brownish, without white ; nos- 

 trils nearly median ; bill longer than tarsus. 



Aythya, 13. 

 Kkk. Head black or gray, with white ; nostrils nearly 

 median; bill about as long as tarsus. 



BuCEPHAIiA, 14. 



^. Nail broad, scarcely distinct. 



I. Feathers extending on culmen and partly on sides 



of upper mandible. . . Somatebia, 18. 



II. Feathers not extending on culmen ; bill small, 



much tapering. . . Histbionicos, 17. 



tt Bill narrow, nearly cylindrical ; the lamellae acute, recurved, 



like saw-teeth ; usually crested. Fish Ducks. (MBBGnsr^.) 



m. Bill not black ; tarsus more than half the length of middle 



toe MEE0CS, 21. 



mm. Bill black; tarsus half length of middle toe. 



LOPHODTTES, 33. 



/. CYGNUS, Linnaeus. Swans. 



> Olor., Wagler. 



1. C. buccinator. Rich, Tettmpeteb Swan. Tail 

 (normally) 24 feathered; bill without yellow spot, longer 

 than head; nostrils sub -basal; L. about 50. Miss. 

 Valley, "W. and N. 



3. C. columbianus, (Ord.) Coues. Whistling Swan. 

 Tail 30 feathered; bill with a yellow spot, not longer 

 than head; nostrils median; L. 50. N.Am. {(J.ameri- 

 camts, Sharpless.) 



