FA3L L. BUCKS, GEESE, AND SWANS 285 



B. Bill peculiarly bulging at base ; ^ nail large and so united with the bill 



as to give the nail a very indistinct outline. (J.) 

 B. Bill appendaged with a lobe at base formed of the skin of the cheeks ; ^ 



culmen about 1 long ; speculum ^ violet 20. Harlequin Duck. 



B. Bill appendaged with a leathery expansion at the sides near tip ; cul- 

 men over 1^ long ; speculum white. The Labrador Duck (150. Camp- 

 tolaimus labradorius) might possibly be found, though it is thought 

 to be extinct. 

 B. Bill of the usual duck form. (C.) 



C. Tail pointed (over 6 long, jnale ; about 3 long, female); bill black 

 and orange ; nostril within less than \ inch of frontal feathers . . . 



19. Old Squaw. 



C. Nostril about ^ inch from frontal feathers ; nail of bill narrow and 

 distinct. (D.) 

 D. Bill high at base (over ^ as high as long) ; under tail coverts white. (I.) 

 D. Bill not so high at base ; under tail coverts dark. (E.) 

 E. Bill decidedly wider near tip than at base.^ (G.) 

 E. Bill with the width near tip about the same as at base (in any case 

 less than i inch wider). (F.) 



F. Bill about I as wide as the length of culmen 11. Redhead. 



F. Bill about i as wide as long 12. Canvas-back. 



G. 3Iale with an orange ring around neck ; speculum ^ bluish-gray ; 



female chiefly brown 15. Ring-necked Duck. 



G. Male with white speculum ; female with white face. (H.) 



H. Wing over 8^ long 13. American*Scaup Duck. 



H. Wing under 8^ long 14. Lesser Scaup Duck. 



I. Male with gloss of the almost black head and throat green ; fprnale 



with a brown head Ifi. American Golden Eye. 



I. Male with the gloss of the dark head and throat purple ; female 



with a brown head 17. Barrow's Golden Eye. 



J. Wing, 10| or more long ; a white wing patch in both sexes 



25. White-winged Scoter. 



J. Wing less than 10^ long. (K.) 

 K. Culmen, If or more long; the feathers on the culmen reaching 

 about as far forward as those on the sides of the upper mandible 



24. American Scoter. 



K. Culmen less than If long ; feathers on the culmen reaching about 

 an inch farther forward than those on the side of the upper man- 

 dible 26. Surf Scoter. 



L. Feathers on the culmen extending forward much farther than those 

 on the side of the upper mandible 23. King Eider. 





