24 On new Reptiles from the Andes of South America. 



three occipitals, median smallest ; postoccipitals not or but 

 feebly enlarged ; three supraoculars, the first as large as or 

 larger than tlie third, with which it is sometimes in contact 

 on the outer side of the second ; nostril in a single or divided 

 nasal ; a single loreai and a freno-orbital ; upper temporals 

 large ; 7 or 8 upper and 5 or 6 lower lal)ials ; chin-shields, 

 one anterior and 3 or 4 pairs ; the two first pairs forming a 

 suture; none of the gulars strongly enlarged transversely; 

 9 or 10 collar-shields. Dorsal scales rather strongly keeled, 

 narrow, elongate tetragonal or hexagonal with very obtuse 

 angles ; lateral scales very small ; 38 to 45 scales, including 

 ventrals, round the middle of the body, 39 to 46 from occiput 

 to base of tail. Ventral plates in 12 longitudinal and 19 to 

 21 transverse rows ; the two median plates as long as broad, 

 the others gradually narrowing towards the sides. Two 

 anterior and 4: to 6 posterior prgeaual plates. Subdigital 

 lamellae smooth. 7 to 10 femoral pores on each side in males, 

 to 7 in females. Caudal scales quadrangular, upper keeled, 

 lower smooth, Olive above, usually with a lighter, black- 

 edged vertebral band, widening towards the head, of which it 

 occupies the upper surface ; sides of males often with small 

 black ocellar spots with white centres; belly greyish, more 

 or less profusely spotted with black ; lower surface of hind 

 limbs and tail often red. 



c?. $. 



mm. mm. 



Total length 180 166 



Head 17 13 



Width of head 12 9 



From end of snout to fore limb .... 24 22 



„ „ „ „ vent 70 66 



Fore limb 20 18 



Hind limb 24 23 



Tail 110 100 



Numerous specimens from Huancabamba, E. Peru, above 

 3000 feet, collected by ]\lr. E. Boettger. 



This species diff'ers from all those previously referred to the 

 genus Fvionodactylus in the number (12) of the longitudinal 

 rows of ventral plates and in the shape of the dorsal scales. 



Leptognathus sancti-joannis. 



Body strongly compressed. Eye moderate. Rostral a 

 little broader than deep, not visible from above; internasals 

 half to two-thirds as long as the prsefrontals ; frontal as long 

 as broad, nearly as long as its distance from the end of the 

 gnout, shorter than the parietals ; nasal divided ; loreai deeper 



