CLASS REPTILIA 



391 



presence of movable eyelids and an external ear opening, both of which 

 snakes lack, and by having small overlapping scales on the ventral side of 

 the body instead of the transverse scutes which snakes- possess. The 

 tails of Uzards are generally long, easily broken off or separated into pieces, 

 and with equal ease more or less completely regenerated, though the regen- 

 erated appendage does not possess vertebrae. Lizards are in most cases 



Fig. 278. — Common horned lizard, Phrynosoma douglassii hernandezi (Girard), of the 

 Great Plains and Rocky Mountain region represents a genus of lizards, often incorrectly 

 called horned "toads" because of their broad, flat, toadlike bodies. The head and body 

 are armed to a varying degree with spines; their range is the western United States and 

 Mexico. {Photographed and contributed by George E. Hudson.) 



oviparous and the eggs are protected by a thin shell with little lime in it. 

 They feed largely on insects, worms, and other small animals and some 

 are to a considerable degree vegetable feeders. 



Geckos (Fig. 277) are lizards which inhabit all warmer regions, are 

 nocturnal, and have toes fitted for suction, thus enabling them to run over 

 trees and rocks and even over the walls and ceilings of buildings. The 

 flying dragon, (Fig. 279) found in southeastern Asia and the East Indies, 

 has the ribs extended beyond the sides of the body and covered by a thin 



