102 ELEMENTS OF ORNITHOLOGY. 
which shows itself even in our towns. We take the Coal Tit 
(Parus britannicus) as our example of this group of Birds, 
of which there are seventy-seven species, the greater number, 
and the brighter kinds, being confined to the Old World. 
With few exceptions, they do not extend beyond the Northern 
Hemisphere. 

Coal Titmouse (Parus britannicus). 
A very numerous group of small, brilliant Birds, confined to 
America, and mainly to Tropical America, are known as 
Tanagers, and there seem to be no less than three hundred and 
seventy-four species of them. Their plumage is very often 
more or less extensively or markedly red, but may be of various 
other bright tints, and Yanagra episcopus, which may stand as 
our type, is of a pale blue colour marked with white spots. 
