164 STORY OF THE REPTILES 



E. Bight lung largest or active. (12) AmphisbiBnida. 

 EB. Left lung largest or more active. 



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



(9) Selodermatidm. Gila Monster, 

 FF. Skin not warty ; either scaly or smooth. 

 Q-. Fold of skin obvious along side of body. 



(7) Girdled Lizards, 

 QOr. Fold of skin not obvious or present. 



H. Tongue distinctly forked or with two points 

 at tip. 



I. Tongue scaly, rough, or wrinkled above. 



TeiidcB or (11) Qreaved Lizards. 



II. Tongue not scaly or wrinkled; sometimes 



merely brushlike. 

 K. Tongue sheathed at base. Varanidoe or 



(10) Monitors. 

 KK. Tongue exposed everywhere. 



(13) Lacertidce. 

 HH. Tongue not distinctly forlced, 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) Blindworm Tribe. Anguidm. 

 MM. Tongue not sheathed at tip. 

 (14) Skinh Tribe. 

 LL. Scales and skull devoid of the 

 bones noted ; scales in rows, usu- 

 ally oblique. 

 N. Teeth on upper edge cff jaws. 



(15) AgamidcB. 

 NN. Teeth on sides of jaws. 



(16) IguarddcB. 



The numbers before the family name refer to the 

 order of Mr. Lydekker's families. 



The AgamidoB are a large Old World family in 



