92 INDIAN DITKS. 



Subfamily ANATIN^. 



Key to (jrenera. 



A. Lower poi'tion of tai'sus in front with small reticulate 



scales Dendrocycna, p. 93. 



B. Lower portion of tarsus in front with a row of trans- 



verse scutellse. 



a. Speculum wanting Mannaronctta, p. 202. 



h. Speculum always present. 



a . Outer Avebs of inner secondaries chestnut. 



(i^. Coloration pied chestnut, black and white . . Tadorna, p. 109. 

 b\ Coloration all rufous-chestnut of different 



shades, except on quills Oasavca, p. 114. 



h'. Outer webs of inner secondaries not chestnut. 



c". Bill spatulate Sj)atida, p. 106. 



d-. Bill not spatulate. 



«\ Upper wing-coverts blue or grey-blue . . Querquedula, p. 1S8. 

 h'\ Upper wing-coverts not grey-blue. 



a*. Tail long, with the central tail-feathers 

 acuminated and extending well beyond 



lateral tail-feathei's DaJlJa, p. ISl. 



fc*. Central tail-feathers not elongated, and tail 

 moderate in length. 

 a\ Bill broad, about the length of the head. Anas, p. 123. 

 b\ Bill not very broad and shorter than the 

 head, 

 a''. Upper and low er tail-coverts extend- 

 ing beyond end of rectrices . . . Eimetta, p. 143. 

 ?'^ Upper and lower tail-coverts not 

 extending beyond end of rectrices. 

 a'. Central feathers not acuminate 

 and not extending beyond lateral 



ones Chaulelasmus, p. 148. 



b\ Central tail-feathers more or less 

 aeumiuated and extending slightly 

 beyond lateral ones. 

 a'*. Bill small and about equal in 



breadth throughout .... Mareea, p. 1.55.- 

 h'*. Bill moderate and tapering 



towards tip yettion, p. 162. 



