TRUE REPTILES. 217 
like many of the poisonous snakes. They occur in Mex- 
ico, Arizona, and Lower California. Allied are the water- 
Fic. 261.—Heloderma, a poisonous lizard, 
lizards ( Varanida), the huge monitors, seven feet in length, 
the gigantic lace-lizard, and others. 
