FAMILY ANATIDiE. DUCKS, GEESE, AND SWANS. 71 



SUBFAMILY FUUQULIN/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 wliite patch (male) ; head, 

 grayish Ijrown with white pateh (female or immature) ; no 

 dark stripes on cheek; bill, less t\\:\u three fourths inch wide. 



Charitonetta albeola. Buffle^head Duck. Dipper Duck. 



See No. 110. 



Charitonetta albeola. 



Section 2. Tail feathers, stiff and pointed. 



Thi-oat, whitisli; cheeks, white (u- whitish; liill, broad, three quarters inch oi- more wide. 



Erismatnra jrmmlri'nsii. Ruddy Duck. 

 See Xo. 



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

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



Nomnny.f- dDininicnf:. flasked Duck. 

 See No. 123. 



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

 Section 1. Belly, white. 



Head, greenisli purple, no white on head; liaek, liarred 

 black and white; speculum, white (male). 



Aythija (iffmi^. 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). Aythi/a ajlinis. Lesser Scaup Duck. Blue-bill. 



See No. lOG. 



* For ilirectious for ineaBUremeiit, see page 'J. 



