68 PROCEEDINGS OP THE ACADEMY OF 



A few large plates exterior to the superior part of the exterior tibial row. Of 

 the latter there are eight or nine, second, third and fourth largest. Posterior 

 preanal plates largest. Above olivaceous, more or less vermiculated with 

 black upon the head, nape and anterior extremities. Sides of a much darker 

 shade, which is well defined superiorly, and is crossed by vertical series of yel- 

 low black-bordered spots. External belly and anterior femoral plates yellow 

 and black varied. In the female the lateral shade takes the form of a band. 

 In a large specimen from Venezuela the anterior regions and extremities are 

 light brown, speckled with black on the head and neck; the lateral vertical 

 spots are upon a ground similar to that of the back. This is Lacerta ameiva, 

 figured by Spix. Total length 20 in. 6 lin. ; head and body 7 in. 



Hab. Surinam, Venezuela, Bolivia, Brazil, ("south to Rio Janeiro." Neu- 

 wied), ?Paraguay, ?Trinidad. Mus. Philada. Acad. Washington. 



C. 



A. corvina Cope, Proc. Acad. Nat. Sci. Philada. p. 312, 1861. 



Premaxillary teeth ten. Median occipital plate short ; position of external 

 occipitals longitudinal divergent. Four continuous supraorbitals ; marginal 

 plates five, anterior two longest. Median gular scales small, those of the me- 

 soptychium scarcely larger. Anterior half of antebrachium with a series of 

 plates ; brachium without plates, coarsely scaled ; postbrachials a little larger. 

 Abdominal plates in twelve series. Median preanals largest. Large anterior 

 femoral plates upon the terminal portion of femur; pores in ^ 36, in 9 32. 

 Tibial series four, eight or nine in the external, of which three or four are of 

 nearly equal size. External digit extending beyond internal. Tail plates 

 weakly keeled. General color black; under surface of belly and tail glaucous 

 green, sometimes tinged with yellow. Total length 16 in. 2 lin.; head and 

 body 4 in. 10 lin. 



Hab. Sombrero Island, West Indies. Mus. Philada. Acad. Smithsonian. 

 Compar. Zoology Cambridge. 



A. punctata Gray, Catal. Liz. Brit. Mus. p. 17. 



Postbrachial plates rather large, rhombic. Ventral shields in fourteen rows. 

 Exterior tibial series seven, the second and third largest, nearly equal. Olive 

 with black wavy lines ; sides darker with white spots upon the lower part; 

 head in spirits pale reddish. 



Hab. Demerara. 



A. major Hum. el Bibr., Erp. Gen. v. p. 117. 



Median gular scales larger than the external, equal to those of the mesop- 

 tychium. Brachial plates large, separated from the antebrachials, which are near 

 the fore-foot; posthumerals granular. External tibial plates large. Ab- 

 dominal plates in from fourteen to eighteen series. Preanal plates numerous, 

 not large. Above olivaceous, beneath yellowish or greenish; in the young two 

 light lines on each side, the superior from the temporal ridge. Total length 20 

 in. 7 lin. ; head and body 8 in. 2 lin. 



Hab. Cayenne. Trinidad. 



The antebrachial plates of this species seem to be similar to those of A. 

 corvina. 



D. 



A. a u b e r i Cod. et Bibr., De la Sagra's Hist. Cuba Rept. p. 74. 



Abdominal shields in ten or twelve rows. Occipitals five : marginal supra- 

 oculars five or six, posterior three small ; the superior supraoculars three, 

 sometimes a rudimentary fourth. Temporal region with superior and anterior 

 marginal plates. Premaxillary teeth ten. Gular scales equal; plates of the 

 fold large, in four rows. The antebrachial series of plates bounded within by 

 smaller shields; brachials continuous with the former, little dilated trans- 

 versely. Postbrachials large, transverse. Femoral series eight or nine. Pores 



[Feb. 



