NATURAL SCIENCES OF PHILADELPHIA. 65 



This species is most nearly related to anberi of Cuba and p 1 e i of Hayti. 

 From the former it differs in the absence of spurs upon the heel, in the com- 

 plete black pale-bordered lateral band and the black of the antero-inferior 

 regions. The same peculiarities of coloration separate it from the p 1 e i, which 

 has in further distinction the median gular scales a little larger, and the tail 

 spotted. This species is very abundant in New Providence, and, like the others, 

 is very swift. The most ready way of obtaining them is by shooting. 



bb. Four supraorbital plates. 

 A. 1 a e t a Cope. 



? A. guttata Gray, Catal. Liz. Brit. Mus. p. 18, not Cnemid. guttatus Wiegra. 



Nostril in the nasal suture; common suture of fronto- nasal plates elongate. 

 Five marginal supraoculars, first and second longest; equal. Nine premaxillary 

 teeth. Three gular folds; gular scales all large, the posterior largest. Plates 

 of the posterior fold larger than those of the median. Two series of ante- 

 brachials continuous with three of brachial plates ; postbrachials large, irregular. 

 Scales of the dorsal region large. External and internal digits very short, the 

 latter extending beyond the former, its claw short, curved. Posterior preanals 

 largest, one or two large anterior. Eight series of femora] plates ; fifteen to 

 seventeen pores. Six or seven external tibials, the second and third very large. 

 Male, above olive, black-speckled; sides dark with cross rows of black- edged 

 white spots. Female rather bright olivaceous, with a light brown pale-bordered 

 band upon each side. The superior pale border very indistinct, extending 

 from the temporal angle, the inferior a bright band bordered with black 

 beneath, extending from the middle of the tympanic orifice some distance upon 

 the tail. Head brown above. Under surfaces yellowish, external belly plates 

 black spotted, external tibial plates and tail bluish varied. Total length 15 in.; 

 excluding the tail, 5 in. 



Hab. Near Rio Janeiro; according to Gray, Demerara and Pernambuco. 

 Mus. Compar. Zoology, Cambridge, No. 1483. 



In the above description the colors of the male are taken from Dr. Gray. I 

 have presumed that the two female specimens described belong to the species 

 guttata, on account of their near resemblance to the surinamensis and 

 their difference from it in the tibial shields and anal plates. Dr. Gray's diagnosis 

 furnishes nothing else to base an identification upon. This species further 

 differs from the surinamensis in the larger dorsal scales and longer 

 common fronto-nasal suture. 



A. p 1 e i Bum. et Bibr., Erpetol. Gen. v. 



Median gular scales a little larger than those surrounding; marginal supra- 

 oculars five or six, second longest. One large, one or two small series of ante- 

 brachials, separated by granular scales from the large brachial series ; post- 

 brachials numerous, irregular. Two large posterior preanals, one large median, 

 and several smaller anterior and peripheral. Exterior digit equalling or extend- 

 ing beyond the interior. Seven exterior tibial plates, the last very minute, 

 second and third very large. Femoral plates numerous, the pores sixteen. 

 Premaxillary teeth six, eight or ten ; superior maxillaries twenty-one in the 

 adult, in the oldest specimens three or four posterior only imperfectly bi- or tri- 

 cuspid ; those anterior to the latter are cylindrical with obtusely rounded crowns ; 

 the most anterior conic, curved. In younger individuals the number of com- 

 pressed tricuspid teeth is greater, (though the total number of teeth is less,) 

 until in the youngest all but the "canines" conform to this standard of the 

 generic structure. General color above, brown olivaceous, the posterior ex- 

 tremities, tail and posterior dorsal region more or less distinctly spotted witln 

 yellowish. Sides vertically banded with greenish or yellowish ; superiorly 

 there is usually a series of black spots, which are sometimes only present ante- 

 riorly, sometimes confluent into a longitudinal band. Beneath greenish straw-- 



1862.] 5 



