2 8 4 



WATER FOWL. 



b. Head without elongated crest. 



a ' . Bill long as middle toe without claw, 

 greatest width LESS than one-third the 

 length of culmen. Head long, not 

 bunchy. 



b '. Bill shorter than middle toe without 

 claw, greatest width MORE than one- 

 third the length of culmen. Head 

 bunchy. 



c ' . Bill shorter than head, broad, greatest 

 width nearly HALF the length of the 

 culmen. 



d ' . Bill with membranous expansion on 

 edge of maxilla near tip. 



<?'. Bill very short, narrow, rather pointed. 



a". Anterior edge of nostrils nearer the 

 base than tip. 



b" . Anterior edge of npstrils nearer the 

 tip than the base. 



c" . Bill, height at base two-thirds length 

 of culmen. 



a'". Central tail feathers elongated. 



b" '. Central tail feathers not elon- 

 gated. 



a*. Bill shorter than tarsus. 



6*. Bill longer than tarsus. 



/'. Bill tumid or gibbous. 



g '. Bill with two-thirds of the culmen cov- 

 ered with feathers; pad-like feathering 

 around the eyes. 



k '. Bill with naked parallel frontal proc- 

 esses. Feathering around eyes normal. 



CANVAS BACK. 



Aristonetta. 



SCAUP DUCKS. 



Fuligula. 



LABRADOR 

 DUCK. 



Camptol&m us. 



GOLDEN EYE 

 DUCKS. 



Clangula. 



BUFFEL HEAD 

 DUCK. 



Charitonetta. 



LONG-TAILED 

 DUCK. 



Havelda, 



HARLEQUIN 

 DUCK. 



Histrionicus. 



STELLER'S DUCK. 



Hentconetta. 



SURF DUCKS. 



CEdemia. 

 FISCHER'S EIDER 



DUCK. 



Arctonetta. 



EIDER DUCKS. 



Somateria,, 



