Key to the Species. 
Plumage principally grey : 
a. Bill blackish ; legs red : 
a’ No white band across tail 
6’ A white band across tail ... 
6. Bill and legs yellowish 
3. Plumage principally white 
COLUMBA LIVIA. 
Key to the Subspecies. 
A. Lower-back white 
Lower-back grey 
C. livia. 
C. rupestris. 
... C. eversmanm. 
C. leuconota. 
CO. 1. livia. 
OC. 1. intermedia. 
