[6o 



KEY TO THE WATER BIRDS OF FLORIDA. 



Aythya vallisiieria. 



Aythya affinis. 



Length, 21; Wing, S.40 ; Tarsus, i/.o; Iiill. 2.20. 

 Head rufous brown; speculum grayish ; upper 

 feathers edged with black ; the rest narrowly 

 tipped with white. (See figure sliowing difference 

 in bill from Canvas-back.) 



Length, 20.50; Wing, S.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 {A. rol/aris), but is largjr. 



Length, 19; Wing, 8.50: Tarsus, r.50: Bill, 2. Head 

 black glossed with green ; back grayish ; specu= 

 lum white. 



Length, 17; Wing, 8.10; Tarsus, 1.50: Bill, 1.80. 

 Similar to the preceding species, from which it 

 differs only in being somewhat smaller; head black 

 with purplish gloss; speculum white. 



Aythya americana (male). 

 Redhead Duck. See page 22C, 



Aythya americana (female). 

 Redhead Duck. See page 226 



Aythya marilanearctica (male). 

 Greater Scaup Duck. 

 Bluebill. See page 22S 



Aythya affinis (male). 

 Lesser Scaup Duck. 

 Bluebill. See page 229 



