KEY TO THE SPECIES. 



GROUP I. 



Birds having wings from 5 to 6.50 inches long.^ 

 Section I. Hind toe without flap or lobe. 



Head and neck, chestnut, a patch of green behind 

 the eye; speculum, black (male) ; head and neck, 

 not chestnut (female) . 



Green-winged Teal. 



Anas caroUnensis. 

 See page 47. 



Anas caroliucnsis. 



Section 2. Hind toe with well defined membraneous 



lobe or flap. 



Part 1. Tail feathers, not stiff and pointed. 



Head, greenish purple, with white patch ^^male) ; 

 head, grayish brown with white patch (female or 

 immature); no dark stripes on cheek ; blUlessthan 

 three fourths inch wide. Buffle-head Duck. 



Dipper Duck. 

 Charitonetta albeola. 

 Chai-itonetta albeola. See page 61. 



Part 2. Tail feathers, stiff and pointed. 



Throat, whitish; cheeks, white or whitish; bill, broad, X ™cli or more wide. 



Ruddy Duck. 

 Erismatura rubida. 

 See page 78. 

 Front of head, including cheeks, black (adult) ; head with black stripes on side 

 (female or immature) . Hasked Duck. 



Nomonyx dominicus. 

 See page 79. 



* directions for wing measurement given on page 6. 



