270 _ VERTEBRATE ANIMALS. 
condition. In the true Lizards (Lacerta), all four limbs are 
present in a well-developed form ; as seen in the common Green 
Lizard (Z. vividis) of Europe. The genus Lacer/a is represented 
in America by the A mezve, of which the Striped Lizard (A mezva 
sex-lineata) of the Southern States may be taken as a good 
example. Of all living Lizards the largest are the Monitors 
(Varanide), which are exclusively confined to the Old World, 
and attain sometimes a length of from six to eight feet. Very 
large, too, are some of the Iguanas (fig. 144), which occur in 
warm regions in various parts of the world, but especially in 
South America, where they are often eaten. Related to the 
Iguanas are the singular Lizards known as the Flying Dragons 
(Draco volans), various species of which inhabit the Indian 
Archipelago and the East Indies. They are all of small size, 
living in trees and feeding on insects; and their great pe- 
culiarity consists in the fact that certain of the ribs are 
straightened out and support a wing-like fold of the skin on 
each side of the body, by means of which the animal can take 
very extensive leaps from tree to tree. 
The Scincoid Lizards form a very large family, represented 
by numerous species in all parts of the world. The species 
Fig. 145@.—The common Skink (Scincus officinalis). 
figured above is a common form in Egypt and Arabia, and was 
formerly used as a remedy in various diseases. A nearly-allied 
