162 



ON THE RBPTILIA OF PEIIU. 



large infralabials, of which three are in contact with the labials, and two pairs 

 with each other. Ear as large as eye opening. Femoral pores fifteen on each 



side. 



Color chocolate-brown above, showing darker spots in proper lights ; below 

 yellow, brown speckled, except the throat and chin and lips, which are black. 



Length (tail partly reproduced) 



" to vent . 



" to axilla 



" to tympanum 



" to orbit . 

 Width of head behind 

 Length of fore limb . 



" of hind limb . 



" • of hind foot . 



M. 

 .130 



.066 



.033 



,015 



.005 



.012 



.020 



.030 



.015 



The characters which distinguish this species from the long-known and large 

 JVi bicarinatus, are the larger gular scuta, the smaller occipital and temporal scales, 

 the eight (not six) ventral rows, and the fifteen (not thirty) femoral pores. 



The characters of the head scuta of this genus are those of the Ecpleopidce ; 

 while those of Thorictis and Crocodilurus are those of the Teidce. 



6. Ceocodiltjrus amazonicus, Spix. 



7. Centeopyx PELViOEPS, Cope, Proceed. Academy PMlada. 1868, 98. 



Nauta. 



8. Centropyx decodon, Cope, loc. cit., 1861, 495. 



Santarem, Brazil. 



9. Centropyx altamazonicus, Cope, sp. nov. 



Dorsal scales very small, hexagonal, smooth, but little larger than the lateral. 

 Ventrals keeled, in sixteen longitudinal rows, and thirty-five transverse to the 

 line of the femoral pores. Two rows of keeled collar scales, the second largest. 

 Gular scales small, equal, and smooth. Four rows of carinate preanal scales, the 

 last composed of six scales. 



Internasal scuta barely attaining mutual contact; frontonasal broader than 

 long ; mutual contact of prefrontals short. Frontal longer than wide, parietals 

 nearly as wide as interparietal (the specimen young). Two narrow transverse 

 occipitals. Nostril on suture between internasal and nasal ; one large loreal, one 

 inferior preocular ; six supraoculars, and three supraorbitals. Scuta on the upper 



