BiEDS 0¥ Indiana. 589 



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

 the side, besides the series along the upper edge. 



Subfamily AnatiNjE. 

 e'. Hind toe without lobe or flap. 



/'. Bill not spoon shaped ; scarcely widened towards the tip. 

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



A'. Tail not pointed, its middle feathers not unusually long in 

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



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

 male; female with tail much shorter; speculum violet. 



Dafila. 17 

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



Aix. 18 

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



Spatula. 16 

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



i^. Tail feathers with bases scarcely concealed by short coverts; 

 tail feathers narrow and stiff. 



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

 backward beneath the tip of upper mandible. 



Erismattira. 24 

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



XOMONYX. 



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

 k^ . Feathering on lores or forehead not reaching beyond pos- 

 terior border of nostril. 

 l^. Graduation of tail less than length of bill from nostril. 



Aythya. 19 

 P. Graduation of tail more than length of bill from nostril, 

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

 on edge at base of upper mandible. 

 n^. Wing less than seven inches long; eyes brown. 



Chaeitonetta. 21 

 n'. Wing over seven inches long. 



o\ Nostril in middle of bill, or nearer tip than 

 base; eyes yellow. GiiArrciONETTA. 20 



o'. Nostril nearer the base than tip of bill; male 

 with long tail. Clangula. 22 



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

 base, or on sides. 

 p^ . Bill swollen at base. Oidemia. 23 



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

 q^. Bill appendaged with a lobe on each side 

 near base; speculum violet. 



HiSTEIONICUS. 



q'. Bill with a leathery expansion on sides of 

 upper mandible ; cheeks bristly ; speculum 

 white. Camptolaimtjs. 



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

 nostril ; bill swollen at base. Somateria. 



