FAMILY ANATIDvE. DUCKS, GEESE, AND SWANS. 



71 



SUBFAMILY FULIQULIN^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 

 d:irk stripes on cheek; bill, less than three fourths inch wide. 



Charitonetta albeola. Buffle=head Duck. Dipper Duck. 



See No. 110. 



Chaiftonetta albeola. 



Section 2. Tail feathers, stiff and pointed. 



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



Erismatnra jamaicensis. 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. Hasked 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 affints. Lesser Scaup Duck. Iilue=bill. 



See No. 106. 



Aythya affinis. 



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. 



