1. GERRHONOXUS. 2. OPHISAURTJS. 279 



between the proefrontal and the rostral ; nasal separated from tho 

 rostral ; a suprauasal ; two superposed postnasals ; one loreal and a 

 large canthal descending between tho latter shield and the pra3- 

 ocular ; three outer supraoculars ; ten or eleven upper labials. A 

 rather narrow granular zone along the side of the neck. Lateral 

 fold strong, extending on the neck. Dorsal scales in eighteen or 

 twenty longitudinal series, the six median strongly keeled, the 

 others smooth or indistinctly keeled ; fit'tj"-two to fifty-four trans- 

 verse series ; ventrals larger than dorsals, in twelve longitudinal 

 series. The adpressed fore limb reaches the eye ; the length of the 

 hind limb equals half or three fifths the distance from axil to groin. 

 Tail subquadrangular at tho base ; upper caudal scales strongly 

 keeled. Olive-brown above, back uniform or black-spotted, sides 

 spotted with black and greenisli white ; lower surfaces greenish 

 white, uniform or with scattered blackish dots. 



inilliiu. millim. 



Total length (tail re- Body 76 



IH'oduced) 185 Fore limb 22 



Head 18 Hind limb 28 



Width of head .... 12 



Guatemala ; Vera Cruz. 



2. OPHISAURUS. 



Ophisaurus, Dm(d. liept. vii. p. 346 ; Fitzinrf. N. Classif. Rept. p. 20; 



Wagler, Si/st Amph. p. 169 ; Wiegm. Herp. Mex. p. 11 ; Uian. (5j- 



Bibr. V. p. 421 ; Grai/, Cat. Lk. p. 50. 

 Bipes, Oppel, Onht. p. 43 ; Wayl. I. c. 

 Pseudopus, 3Ierrem, Tent. p. 78 ; Fitting. I. c. ; Wiegm. I. c. ; Dnni. 



^ Bibr. I. c. p. 412 ; Gray, I. c, ; Gunth. Rept. Brit. Iml. p. 74. 

 Hyaliuus, 3Ierr. I. c. p. 79. 



Proctopus, Fischer, Mem. Soc. Nat. Mosc. iv. 1830, p. 241. 

 Dopasia, Gnig, Ann. ^- Mag. N. II. (2j xii. 1853, p. 389. 

 Ophiseps, Blytli, Journ. As. Sue. Beng. xxii. 1853, p. 655. 

 Ilyalosaurus, Gilnth. Ann. 8f Mag. N. H. (A) xii. 1873, p. 351. 



A lateral fold. Scales squarish-rhomboidal, forming straight 

 longitudinal and transverse series. Limbs absent externally, or 

 reduced to a rudiment of tlie hind pair. Teeth with conical or sub- 

 spherical crowns. Pterygoid teeth ; palatine and vomerine teeth 

 present or absent. 



South-eastern Europe, North Africa, South-western Asia, Hima- 

 layas and Burma, South-eastern Norlli Amei"ica and Mexico. 



