:6o 



KEY TO THE WATER BIRDS OV FLORIDA. 



,/ f^ 



Aythya vallisneria. 



Aythya affinis. 



Length, 21; Wing, S.40 ; Tarsus, 1.60; Bill, 2.20. 

 Head rufous brown; speculum grayish ; upper 

 feathers edged with black ; the rest narrowly 

 tipped with white. (See figure showing difference 

 in bill from Canvas-l)ack.) 



Length, 20.50; Wing, 8.30; Tarsus, 1.60; Bill, 2.20. 

 Head grayish brown ; speculum grayish ; upper 

 feathers edged with black; the rest narrowly 

 tipped with white. Closely resembles female of 

 Ring-neck Duck (.•/. co/hiris), but is largjr. 



Length, 19; Wing, S. 50: Tarsus, 1.50: Bill. 2. Head 

 black glossed with green : back grayish ; specu= 

 lum white. ' 



Length, 17: Wing, S.io: Tarsus, 1.50: Vy\\\. i.So. 

 Similar to the preceding species, from wliicli it 

 differs onlv in lieing somewhat smaller: head black 

 with purplish gloss; speculum white. 



Aythya americana (male). 

 Redhead Duck. See page 226 



Aythya americana ^female). 

 Redhead Duck. See page 226 



Aythya marila nearctica (male). 

 Greater Scaup Duck. 

 Bluebill. See page 22S 



Aythya affinis (male). 

 Lesser Scaup Duck. 

 Bluebill. See page 229 



