INDEX TO KEY. 



Family ANATID^E. 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 . . . . " " 57- 



Subfamily ANATIN^E. 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 '. . See page 58. 



GROUP 2. Wing, 8 to 10 inches long . . . . " " 59. 



Section 1. Belly, white . . . . ! " " 59. 



Section 2. Belly, not white . . . . . . " " 59. 



GROUP 3. Wing, 10 to 14 inches long . . . . . " " 60. 



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



lower part . . . . . . . . " " 60. 



Section 2. Belly, not white '. . . " " 61. 



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 . . . ... See page 62. 



Section 1. Tail feathers, not stiff and pointed . . . " " 62. 



Section 2. Tail feathers, stiff and pointed . . . " " 62. 



GROUP 2. Wing, 6 . 50 to 7 . 50 inches long . . . . " " 63. 



Section 1. Belly, white . . . . . '. " " 63. 



Section 2. Belly, not white . . . " " 64. 



GROUPS. Wing, 7. 50 to 8. 50 inches long . . . " " 64. 



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



sometimes tinged with dusky or gray on lower part . See page 64. 



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



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



Section 3. Belly, not white . . . . " " 65. 



54 



