164 STORY OF THE REPTILES 



E. Right lung largest or active. (12) Amphishcenidce. 

 EE. Left lung largest or more active. 



F. Skin distinctly warty — not scaly ; teeth grooved. 



(9) Ilelodermatidce. Gila 3Ionster. 

 FF. Skin not warty ; either scaly or smooth. 

 G. Fold of skin obvious along side of body. 



(7) Girdled Lizards. 

 GG. Fold of skin not obvious or present. 



H. Tongue distindhj forked or with two jioints 

 at tip. 



I. Tongue scaly, rough, or wrinkled above. 



Teiidce or (11) Greaved Lizards. 



II. Tongue not scaly or wrinkled; sometimes 



merely brushlike, 

 K. Tongue sheathed at base. Varanidce or 



(10) 3Ionitors. 

 KK. Tongue exposed everywhere. 



(13) LacertidcB. 

 II II. Tongue not distinctly forked, or double- 

 pointed ; sometimes merely notched. 

 L. Scales of body underlaid, and roof 

 of skull behind overlaid, with flat 

 bones ; scales not arranged in rows. 

 M. Tongue sheathed at the tip. 



(8) Blindivorm Tribe, A7iguid(B. 

 MM. Tongue not sheathed at tip. 

 (14) Skink Tribe. 

 LL. Scales and skull devoid of the 

 bones noted ; scales in rows, usu- 

 ally oblique. 

 N. Teeth on upper edge of jaws. 



,(15) Aganiida'. 

 NN. Teeth on sides of jaws. 



(16) Iguanidm. 



The numbers before the family name refer to the 

 order of Mr. Lydekker's families. 



The Agamidce are a large Old World family in 



