14. FROSTROPHirs. 123 



14. UROSTROPHUS*. 



Urostrophus, Bum. <!j- Bihr. iv. p. 77 ; Gray, Cat. Liz. p. 184. 

 Urostroplaus, part., Fitziny. Syst. Rept. p. G2. 



Tympanum distinct. Body subcylindrical or slightly compressed, 

 covered with small smooth scales, granular on the back ; no nuchal 

 or dorsal crest. Head with feebly enlarged scales. A transverse 

 gular fold ; no gular pouch. Digits slightly compressed, with 

 smooth lamellie infcriorly. ^o femoral pores. Tail long, round. 

 Lateral teeth tricuspid; pterygoid teeth. No sternal fontanelle. 

 Abdominal ribs. 



South America. 



1, Urostrophus vautieri. 



Urostrophus vautieri, Gray, Cat. p. 184. 

 Urostrophus vautieri, Dmn. i^- Bibr. p. 78, pi. xxsvii. fig. 1. 

 Lsemanctus (Urostrophus) vautieri, part., Fitz. I. c. 

 Leiosaurus vautieri, Reinli. ^- Liitk. Vidensh. Medclel. 1861, p. 223. 



Head moderately large ; snout rounded, with obtuse canthus 

 rostralis ; nostril nearer the end of the snout than the orbit ; tym- 

 panum oval, as large as the eye-opening ; upper head-scales smooth, 

 largest on the snout, smaller on supraorbital region ; scales forming 

 regular si;praorbital semicircles, separated by one or two rows of 

 scales ; occipital enlarged, a little smaller than the tympanum ; a 

 series of enlarged infraorbitals, second largest ; eight or nine upper 

 and seven or eight lower labials. Gular scales small and granular, 

 strongly enlarged and polygonal near the labials. Scales on upper 

 surface of body and limbs very small, granular, juxtaposed, of lower 

 surfaces larger, flat, slightly imbricate, all smooth. Limbs and 

 digits moderately elongate ; the adpressed hind limb reaches the 

 shoulder or the nock in males, not to the axilla in females. Tail 

 about once and a half the leugth of head and body, curling at the 

 end, covered with small, keeled scales. Brown above, marbled with 

 darker, dirty white infcriorly ; tail above with equidistant black 

 spots. 



<?■ $• 



Total length 158 227 millim. 



Head 17 21 



Width of head . . 12 14 



Body 50 71 



Fore limb 25 32 „ 



Hind limb 36 a 



Tail 91 135 „ 



* ^Leiosaurus valdivianus, Pbilippi, Arch. f. Nat. ISGl, p. 298. — Valdivia, 

 ChiU. 



