ANATID^E. 85 



feathers, and culmen longer than 

 middle toe, without claw. 



Dafila. (Page 97.) 

 i 2 . Tail-feathers broad and rounded at tips. 



Aix. (Page 98.) 

 A". Bill spatulate (very broad near end and narrow 



at base) Spatula. (Page 96.) 



g*. Hind toe with a broad, membraneous lobe. 



A 1 . Feathering on lores or forehead not reaching 



beyond posterior border of nostril. 

 i\ Graduation of tail less than length of bill from 



nostril. 



j l . Loral feathering with a decidedly convex 

 anterior outline ; nail less than one- 

 third as wide as width of bill across 

 middle portion. Aythya. (Page 101.) 

 ? 2 . Loral feathering with straight or even 

 slight!}^ concave anterior outline; 

 nail more than one-third as wide as 

 bill across middle portion. 



Netta. (Page 100.) 



i 2 . Graduation of tail much more than length of 

 . bill from nostril. 



/. Distance from tip of bill to loral feather- 

 ing less than graduation of tail. 

 k l . Distance from anterior end of nos- 

 tril to loral feathers equal to or 

 greater than width of bill at 

 base. 



I 1 . Distance from anterior end of 

 nostril to tip of bill much 

 less than from same point 

 to loral feathers ; tail less 

 than twice as long as tarsus. 

 Glaucionetta. (Page 104.) 

 f 8 . Distance from anterior end of 

 nostril to tip of bill much 

 greater than from same 

 point to loral feathers; 

 tail more than twice as 

 long as tarsus. 

 Charitonetta. (Page 106.) 

 A*. Distance from anterior end of nos- 

 tril to loral feathering much less 

 than width of bill at base. 



