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. 



rr 



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; hill, less than three fourths inch wide. 



Charitonetta albeola. Buffle=head Duck. Dipper Duck. 



See No. 110. 



Charitouetta albeola. 



Section 2. Tail feathers, stiff and pointed. 



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



Erismatura jamawensis. 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. 



Noiiiiniyj- dnmininis. 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). 



Aythyd affi,nis. Lesser Scaup Duck. Blue bill. 



See No. 106. 



Aythya nflinis. 



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

 white (female). Aijtlnja affinis. Lesser Scaup Duck. Blue bill. 



See No. 106. 



* For directions for measurement, see page 9. 



