162 



ON THE REPTILIA OF PERC. 



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 ai 



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 . 



d chin and lips, which are black. 



M. 



.130 

 .066 

 .033 

 .015 

 .005 

 .012 

 .020 

 .030 

 .015 



known and large 



The characters which distinguish this species from the long 

 jy; 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 Ecpleopidoz ; 

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



6. Crocodilurus amazonious, Spix. 



7. Centropyx pelvioeps, Cope, Proceed. Academy Philada. 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 



