INDEX TO KEY. 



Family ANATIDiE. Ducks, Geese, and 



Swans. 

 Subfamily MERGING. Mergansers. 



Fish-eating Ducks having narrow bills with tooth-like serrations on edges; 

 tarsus, scutellate (transverse scales) in front. 



Group 1. Wing, 6 . 50 to 8 . 50 inches long See page 56. 



Group 2. Wing, 8.50 to 12 inches long " " S7- 



Subfamily ANATINtE. River and Pond Ducks. 



Ducks having hind toe without well developed membraneous lobe or flap; 

 tarsus, scutellate (transverse scales) in front. 



Group 1. Wing, 5 to 7. 50 inches long 

 Group 2. Wing, 8 to 10 inches long 



Section 1. Belly, white . 



Section 2. Belly, not white 



Group 3. Wing, 10 to 14 inches long 



Section 1. Belly, white, or tinged with dusky or gray on 



lower part 

 Section 2. Belly, not white 



Subfamily FULIGULIN^. Bay and Sea Ducks. 



Ducks having a flap or membraneous lobe on hind toe; tarsus, scutellate 

 (transverse scales) in front. 



Group 1. Wing, 5 to 6.50 inches long 



Section 1. Tail feathers, not stiff and pointed 

 Section 2. Tail feathers, stiff and pointed 

 Group 2. Wing, 6 . 50 to 7 . 50 inches long 

 Section 1. Belly, white 

 Section 2. Belly, not white 

 Group .3. Wing, 7 . 50 to 8.50 inches long 



Section 1. Head, with more or less white or brownish white ; 



sometimes tinged with dusky or gray on lower part 



Section 2. No white or grayish white on head; belly, white, sometimes 



tinged with grayish white on head . . See page 65. 



Section 3. Belh', not white . . " " 65. 



54 



