SupramMity CALAENADINAE. 
This is a very small family consisting of a single genus (Calaenas) and 
that genus of a single species, which again is divided into two subspecies, 
one of which inhabits the Indian region. 
The subfamily differs from those already dealt with in having a tail 
of only twelve feathers, but it agrees with the genus Carpophaga in having 
an ambiens muscle and an oil-gland, but no intestinal caeca. The legs 
are long, and both legs and feet strong and well adapted for walking, and 
the bill has a fleshy protuberance at the base, more highly developed 
in the male than in the female. The most striking external characteristic, 
however, consists in the long metallic green hackles of the neck, which at 
once distinguishes it from all other Pigeons. 
Genus CALAENAS. 
Characteristics those of the subfamily. 
