26 REPTILES. 



Fam. 4. Lizards, (Lacertinid^), 



Head pyramidical, covered with regular many-sided shields ; 

 supraorbital plate rig^id. Throat scaly, often with a cross fold in 

 front, and a collar of larger scales behind. Tongue elongate, flat, 

 free at the base, exsertile, long-forked. Teeth hollow rooted. 

 Scales granular or rhombic, keeled. Sides flat, covered with small 

 granular scales. Inhab. Old or Eastern World and Australasia. 



Synopsis of the Genera. 



I. Nostril erect, in the loiver hinder angle of the nasal shield, just 

 above the labial shield, ivith 1 or 2 shields behind it. Eyelid 

 distinct. 



A. Toes simple, compressed, not keeled nor fringed. Collar distinct. 



a. Scales granular or 6-sided, elongate. Posterior nasal shield 



single. Collar distinct. 



1. ZooTOCA. Lower eyelid scaly, opaque. I 



b. Scales granular or 6-sided, elongate. Posterior nasal shields 2, 

 small, one above the other. Collar distinct. 



3. Thetia. Lower eyelid transparent. 



2. Lacerta. Lower eyelid opaque. Chin-fold distinct. Abdo- 

 minal shields narrowed behind. 



4. Teira. Lower eyelid opaque. Chin-fold distinct. Abdominal 



shields square. 



5. NucEAS. Lower eyelid opaque. Chin-fold indistinct. Abdo- 



minal shield narrow behind. Preanal shields one before the 

 other. 



c. Scales rhombic, keeled. Postei'ior nasal shields 2, small, one 



above the other. 



6. NoTOPHOLis. 'Collar and throat-fold distinct. 



7. Tropidosaurus. Collar and throat-fold indistinct. 



d. Scales rhombic, keeled. Posterior nasal shields single. Collar 



indistinct. 



8. Algira. Ventral shields roundish, thin. 



B. Toes keeled beneath, and sometimes fringed on the sides. Scales 



keeled. Posterior nasal single. 



9. Acanthodactylus. Toes fringed on the sides. 



10. PsAMMODROMus. Tocs uot fringed on the sides. Collar in- 

 distinct. 



