Cope.J 342 [Xov. 17, 



enlarged. One row of seven very large sc^jles on the mesoptychium. 

 Anal scuta consisting of two large medians surrounded by numerous 

 smaller scales, separated by several rows from the vent. Femora with 

 only three rows over the distal fourth of the length ; within this point 

 small rows separate the plates from the femoral pores ; the latter twenty- 

 four in number. Tibial plates in three rows, those of the internal very 

 small ; no heel spurs. The heel of the extended hind limb reaches the 

 elbow. Five large labials to below the orbit. One postnasal and one 

 large loreal longer than high. Two preoculars, wide and keeled at their 

 middle. A preoculo-loreal resting on the labials. Six inferior labials and 

 six infralabials, the last small. Three supraorbitals ; first and second 

 longer than wide, the third long as wide. Two parietals on each side ; 

 the interparietal separated from them and the frontoparietals by small 

 scales. 



Color brown above and olivaceous below. On the line where the back 

 passes into the side, a series of dark-brown spots situated close together, 

 and presenting angles upwards and downwards. There are about a dozen 

 between the groin and the scapular region, and a series of indistinct pale 

 spots is seen between their inferior apices. From their superior apices, 

 narrow and indistinct dark-brown lines cross the back, sometimes alterna- 

 ting with each other on the median line. 



Measurements. 



mm:. 



Length to extremity of tail 327 . 



Length to vent 102 



Length to axilla 37 



Length to posterior border of ear (axial) 25 



Length of fore leg 42 



Length of fore foot 19 



Length of hind leg 88 



Length of hind foot 47 



From Buenos Ayres, No. 318 ; one specimen. 



This species is allied to both the A. festiva and A. undulata, but differs 

 from both materially in the scutellation of the head. The middle and 

 posterior supraorbital plates are broader than long in these species, and 

 the superior preocular is narrower, and is keeled near to its anterior bor- 

 der in whole or in part. The interparietal plate is in contact with the 

 surrounding scuta, and not, as in A. leptophrys, surrounded by small 

 scales. 



Celestus steindachnerii Cope. 



From Boruca ; No. 300 ; one specimen. This individual has thirty-six 

 longitudinal series of scales, which have nine longitudinal keels on the 

 middle and posterior parts of the body and on the tail, and are without 

 prominent median keel. Anterior scales smooth. Two prefrontals. This 

 specimen presents characters of both the C. steindachnerii and the chaly- 



