BIRDS OF INDIANA. 589 



Bill broad; lower mandible with a very distinct^series of lamella' along 

 the side, besides the series along the upper edge. 



Subfamily ANATIN i . 

 e 1 . Hind toe without lobe or flap. 



f l . Bill not spoon shaped ; scarcely widened towards the tip. 

 g l . Tail feathers narrow, rather pointed ; no crest. 



h 1 . Tail not pointed, its middle feathers not unusually long in 

 male; speculum green, violet or white. ANAS. 15 



A 2 . Tail pointed; its middle feathers much lengthened in the 

 male; female with tail much shorter; speculum violet. 



DAFILA. 17 

 g 2 . Tail feathers broad, rounded at tip; male with a high crest. 



Aix. 18 

 f 2 . Bill spoon shaped, narrow at base, very broad towards tip. 



SPATULA. 16 

 e 2 . Hind toe with a broad lobe or flap. 



t 1 . Tail feathers with bases scarcely concealed by short coverts; 

 tail feathers narrow and stiff. 



j l . Outer toe longer than middle toe ; nail of bill small, bent 

 backward beneath the tip of upper mandible. 



ERISMATURA. 24 

 j 2 . Outer toe shorter than middle toe; mail of bill normal. 



NOMONYX. 



i 2 . Tail feathers with their bases well hidden by their coverts. 

 k 1 . Feathering on lores or forehead not reaqhing beyond pos- 

 terior border of nostril. 



1 1 . Graduation of tail less than length of bill from nostril. 



AYTHYA. 19 



1 2 . Graduation of tail more than length of bill from nostril. 

 m 1 . Bill ordinary, not swollen; having no appendage 



on edge at base of upper mandible. 

 w 1 . Wing less than seven inches long; eyes brown. 



CHARITONETTA. 21 



n 2 . Wing over seven inches long. 



1 . Nostril in middle of bill, or nearer tip than 

 base ; eyes yellow. GLAUCIONETTA. 20 



2 . Nostril nearer the base than tip of bill; male 

 with long tail. CLANGULA. 22 



m 2 . Bill not ordinary, swollen or else appendaged at 

 base, or on sides. 



p l . Bill swollen at base. OIDEMIA. 23 



p 2 . Bill not swollen at base, but appendaged. 

 q 1 . Bill appendaged with a lobe on each side 

 near base; speculum violet. 



HISTRIONICUS. 



q 2 . Bill with a leathery expansion on sides of 

 upper mandible ; cheeks bristly ; speculum 

 white. CAMPTOLAIMUS. 



k 2 . Feathering on forehead or lores extending to or beyond 

 nostril; bill swollen at base. SOMATERIA. 



