NATURAL SCIENCES OP PHILADELPHIA. 67 



aa. Frontal plates two ; palatine teeth present. 

 A. bifrontata Cope. 



Three posterior supraoculars, surrounded with granular scales in the male. 

 Marginal supraoculars five, two anterior elongate. Frontal shield divided 

 transversely. An indistinct longitudinal frontal carina. Posterior gular scales 

 larger than the anterior. Two series of antebrachial scales, continuous with 

 one brachial. Postbrachials large, transverse. Marginal preanals largest. 

 Femorals numerous; the pores fifteen to nineteen. Plates of the median tibial 

 series not small ; nine plates in the external, third and fourth largest. External 

 digit not equalling the tip of the internal. Tail plates narrow, strongly keeled. 

 Above brownish pea-green, tail paler; in young specimens traces of two lateral, 

 and one median pale line, sometimes visible posteriorly in adults. Occasionally 

 a few brown spots upon the rump. External belly plates varied with blue and 

 white. Inferior surfaces yellow. In females the anterior supraocular is in 

 contact with the second, the lateral longitudinal bands are more distinct and 

 enclose one of a deeper shade, and there are two rows of deep brown spots on 

 the posterior part of the dorsal region. Tail spotted with brown above. Total 

 length 14 in. ; head and body, 4 in. 6 lin. 



Hab. St. Thomas, W. Indies. Mus. Philada. Acad. 



The specimens described as females are labelled as having come from New 

 Grenada, probably incorrectly. 



II. Four rows of tibial shields, three appearing on the inferior surface. Ex- 

 ternal posterior digit not reaching the extremity of the internal. 



A. praesignis Cope. 



Cnemidophorus prcesignis Bd. k Gd., Proc. Acad. Nat. Sci. Phila., 1852, p. 129. 



Five marginal supraorbitals; external occipitals small. Posterior gular 

 scales larger than anterior. Two series of antebrachials continuous with the 

 brachial. Postbrachials numerous, subhexagonal, anterior claws very elongate. 

 Eight femoral series medially; pores thirteen to seventeen. Eight plates in 

 the external tibial series, second and third largest. Two posterior, a median, 

 and sometimes an anterior preanal. 9 Deep brownish olivaceous above ; a 

 broad median dorsal band, bounded on each side by transverse black bars, 

 which extend to a black border of a yellowish lateral line which extends from 

 the temporal ridge. An inferior yellow line from the auricular border, sepa- 

 rated from the superior by a broad black band, which is traversed by a single 

 row of yellow spots. Sides and extremities black-green spotted. Tail green, 

 black spotted; two lateral light lines anteriorly. In the male the median band 

 is better defined. The light superior border of the lateral black band vanishes 

 posteriorly; the inferior is less distinct: over all are about seven longitudinal 

 series of yellow spots. Beneath pale greenish yellow. Length of head and 

 body 5 in. (Tail mutilated.) 



Hab. Panama.* Mus. Smithsonian. Philada. Acad. 



The coloration is the principal means of distinguishing this species from that 

 succeeding. 



A. surinamensis Gray, Catal. Liz. Brit. Mus. p. 18. 



Lacerta ameiva, L. lateristriga et L. tristriata Spix, Anim. Braz. tab. xxiii. et 

 xxiv. 182. 



Teius ameiva Merr., Nieuw. Zool. Braz. Rept. p. 170. 



Ameiva vulgaris Licht., Dum. & Bibr. Erp. Gen. 



Two series of antibrachial plates, nine in the exterior, which is continuous 

 with the brachial; postbrachials irregular, subquadrate. Larger scales extend- 

 ing across the posterior gular region ; those of the neck-fold in about four rows. 



* " Said to be abundant at Para." Hallowell, Proc. Acad. Nat. Sci. 483, 1860. Panama, 

 not Para, is meant, 



1862. J 



