2G. PROCTOPORUS, 4V.i 



parietal narrower and a littlo shorter than parictals, pontagonal, 

 hardly wider posteriorly than anteriorly, ouee and a halt' as long as 

 broad ; three subequal occipitals ; three supraoculars ; a loreal and 

 afrenoorbital ; a row of very small infraorbitals ; temples irregularly 

 shielded ; chin-shields, one anterior and four pairs, the first two 

 pairs entirely, the third anteriorly, in contact ; gular scales sub- 

 quadrangular, those in contact with the chin-shields a little larger ; 

 about twelve transverse rows of scales between the chin- shields and 

 the edge of the collar ; about ten collar-shields. jS^uchal scales 

 very small, round ; dorsal scales narrow, quadrangular, feebly keeled 

 or striated, the transverse series interrupted on the median dorsal 

 line ; a lateral line of granular scales between the dorsals and ven- 

 trals ; fifty-four scales between the occiput and the base of the tail, 

 fourteen of which are anterior to the fore limbs. Ventral plates 

 quadrangular, in twelve longitudinal and twenty-six transverse 

 series. A pair of anterior pra^anal shields, and a second row of six 

 narrow elongate shields, with a small triangular one wedged in 

 between the median pair posteriorly. Limbs with smooth shields. 

 Females with two or three femoral pores on each side. Tail thick, 

 covered with scales like those of the body. Dark brown above, 

 bluish grey inferiorly, dotted with darker. 



millim. millira. 



Total length (tail broken) b7 From end of snout to 



Head 12-5 vent 58 



Width of head 7 Fore limb 13 



From end of snout to fore Hind limb 17 



limb 17'5 



Chanchamayo Eiver, eastern slope of the Peruvian Andes. 



2. Proctoporus imicolor. 



E-iama unicolor, Grca/, Proc. Zool. Soc. 18o8, p. 446, pi. xv. fig. 2. 

 Proctoporus pachyurus {non Tsch.), Giinth. Proc. Zool. Soc. 1859, 



p. 89. 

 Ecpleopus (Proctoporus) unicolor, Peters, I. c. p. 223. 



This species differs from P. pachyurus by the still more elongate 

 body and weaker limbs, the less depressed head, the shorter snout, 

 and in the following points : — Interparietal hexagonal, considerably 

 broader posteriorly than anteriorly, longer than parictals ; a median 

 occipital is frequently absent, and, if present, is very snuiU ; no 

 loreal ; temporal shields larger ; only the two anterior pairs of chin- 

 shields in contact ; they are followed by several large similar shields, 

 the median pair resembling an additional pair of chin-shields ; collar- 

 shields more elongate, eiglit or nine. Xuchal scales much larger 

 and more qiiadrangular ; thirtj'-seven to fortj'-fonr scales from occi- 

 put to sacrum inclusively ; thirty-six to thirty-eight scales round 

 the middle of the body ; twentj--threo to twcntj^-six transvci'se rows 

 of ventrals. Pra-anals five or .seven, a .small i)air anteriorly, three 

 or five elongate shields forming a second row. Males witli nine to 



