366 scrNciD^. 



pterygoids toothed. Lateral teeth conical or with spheroid crowns. 

 Eyelids well developed, scaly. Tympanum distinct, deeply sunk. 

 Nostril pierced in the nasal ; supranasals present ; prjefrontals, 

 frontoparietals, and interparietal distinct. Limbs well developed, 

 pentadactylc : digits subcylindrical or compressed, with transverse 

 lamella) inferiorly, not serrated laterally. 



North and Central America ; Eastern and South-western Asia ; 

 North Africa. 



Synopsis of the Species. 



I. Longitudinal series of dorsal scales in even number ; first upper 

 labial forming a suture with the nasal and the postnasal or the 

 anterior loreal. 



A. 28 or more scales round the middle of the body ; the length 



of the hind limb not more than twice and a half in the distance 

 from snout to vent. 



A postnasal ; 36 to 42 scales round the 



body 1. Jongirostns, p. 368. 



No postnasal ; 32 scales round the body ; 



snout elongate and pointed 2. gutUdatus, p. 369. 



A postnasal ; 28 to 32 scales round 



the body 3. quinqicelineatus, p. 369. 



No postnasal ; 28 scales round the 



body 4. sumichrasti, p. 371. 



B. 28 scales round the middle of the body ; the length of the 



hind limb more than twice and a half in the distance from 

 snout to vent. 



1. A median series of transversely 



enlarged subcaudals 10. ohsoletus, p. 374. 



2. Subcaudal scales not enlarged. 



No postnasal ; supranasal in contact 



with the prsefrontal 11. septentrionalis, p. 374. 



No ])0stnasal ; anterior loreal forming 



a suture with tlic frontonasal 13. tetragramnnis, p. 375. 



A postnasal ; anterior loreal forming 



a suture with the frontonasal 20. calUcephalus, p. 378. 



C. 26 or loss scales round the middle of the body. 

 1. A postnasal. 



a. Limbs overlapping when pressed against the body. 

 a. A. single postmcntal. 



Hind limb more than twice in the length 

 from snout to vent : 24 or 26 scales 

 round the body 5. marginatus^ p. 371. 



