

FAMILY ANATID^E; DUCKS, GEESE, AND SWANS. 71 



SUBFAMILY FULIGULIN/E. 

 Bay and Sea Ducks. 



Ducks having flap or membraneous lobe on 

 hind toe; tarsus, scutellate (transverse scales) in 

 front. 



* Group 1. Wing, from 5 to 6.50 inches long. 

 Section 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; bill, less than three fourths inch wide. 



Charitonetta albeola. Buffle=head Duck. Dipper Duck. 



See No. 110. 



Charitonetta albeola. 



Section 2. Tail feathers, stiff and pointed. 



Throat, whitish ; cheeks, %hite or whitish ; bill, broad, three quarters inch or more wide. 



Erismat urn jamaiwnsis. Ruddy Duck. 

 See No. 



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

 or immature). Tropical species accidental in the United States. 



Nomonyx dominicus, flasked Duck. 

 See No. 123. 



* Group 2. Wing, from 6.50 to 7.50 inches long. 

 Section 1. Belly, white. 



Head, greenish purple, no white on head ; back, barred 

 black and white ; speculum, white (male). 



Aythya affinis. Lesser Scaup Duck. Blue = bill. 



See No. 106. 

 Aythya aflinis. 



Head, brownish, a patch of dull white at base of bill ; no white on ear coverts ; speculum, 

 white (female). Aythya affinis. Lesser Scaup Duck. Blue-bill. 



See No. 106. 



* For directions for measurement, see page 9. 



