Key to the Species. 



A. Plumage principally grey : 



a. Bill blackish ; legs red : 



a' No white band across tail 

 b' A white band across taU . 



b. BUI and legs yellowish 



B. Plumage principally white 



C. livia. 



C. rupestris. 



. . . C eversmanni, 



... C. leuconota. 



COLUMBA LIVIA. 

 Key to the Subspecies. 



A. Lower-back white 



B. Lower-back grey 



C.l. livia. 

 C. I. intermedia. 



