KEY TO THE WATER BIRDS Ol' FLORIDA. 



Aythya vallisiieria. 



Aythya affinis. 



Length, 21; Wing, S.40 ; Tarsus, i/io; 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-back.) 



Length, 20.50; Wing, cS.30; Tarsus, 1.60; 15ill, 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. io//an's), but is larger. 



Length, 19; Wing, 8.50; Tarsus, 1.50: 15111,2. Head 

 black glossed with green ; back grayish ; specu= 

 lum white. 



Length, 17; Wing, S.io; Tarsus, 1.50: Bill, i.So. 

 .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 94 



Aythya americana (female). 

 Redhead Duck. See page 94 



Aythya marila nearctica (male). 

 Greater Scaup Duck. 

 Bluebill. See page yfi 



Aythya affinis (male). 

 Lesser Scaup Duck. 

 Bluebill. See page 97 



