21G INDIAN DUCKS. 



Genus NYEOCA. 



The genus Xijroca, according to Salvadori, wlio divides FuJigula from 

 Nyroca, contains ten species, of ^vhich three are found in Inch'a. Xjjroca 

 differs from Xetta in the formation of the bill and lamollte, the latter 

 having them larger, more prominent, and closer together than the former. 



The genus is a cosmopolitan one, and amongst its ten s{)ecies contains 

 what is, perhaps, our most common duck, namely, Siiroca aj'ricana (or 

 ferruginea), the White-eye. 



Kei/ to the Species. 



a. Back and scapulars distinctly barred or vermiculated . . . ferina (S • 

 h. Back and scapulars merely speckled. 



a'. Head and neck dull chestnut or bay afncana cS . 



b'. Head and neck almost black haeri d . 



0. Upper back and bead rufous-brown, scapulars slightly vermicu- 

 lated ; no white speculum ferina 2 • 



d. No vermiculations on upper plumage ; a white speculum. 



a". Head and neck rufous-brown afrkana 2 • 



h". Head and neck more or less mixed with blackish on the 



sides haei'i $ . 



In addition, haeri may be discriminated from africana by its larger size 

 -and proportionately larger bill. 



