426 bulletin: museum of comparative zoology. 



i^ No lateral black band except in the young and these 



bands not margined with white ameiva praesignis. 



h^ Dorsal surface greenish or olive, often spotted with black, 

 i' Dorsal surface with heavy confluent spots of black. 

 ji Throat sprinkled with a few black spots. . ameiva ameiva. 

 j- Throat smoky. 



k} Brachials in three rows of subequal scales. 



atrigularis. 

 V? Brachials in one row of very large scales and three 



rows of smaller ones ameiva melanocephala . 



i- Dorsal surface with a few black spots not confluent, 

 ji A broad lateral band of brown on each side of the adult. 



ameiva bilineata. 

 'f Lateral stripe indistinct or wanting, .ameiva petersii. 



P Dorsal granules large ameiva laeta 



e- Ten rows of ventral plates. 

 fi A single, part double, row of very large brachials continuous 

 with the antebrachials, 

 g^ Three posterior supraoculars surrounded with granules. 



bifrontata. 

 g2 Three posterior supraoculars not entirely surrounded with 



granules bifrontata divim. 



f- A series of small brachials not continuous with antebrachials, 

 gi Flanks and sides of thighs spotted with pale green, the spots 



arranged mostly in transverse rows exsul. 



g^ Spots much more numerous and covering the back as well 



as the flanks alboguttata. 



d^ Eight or six rows of ventrals. 

 e' Eight rows of ventral plates. 



P A distinct median group of enlarged gular scales. 



gi A single row of large postbrachials undulata undulata. 



g2 More than one row of postbrachials irregularly arranged, 

 h^ Two irregular rows of postbrachials of moderate size. 



undulata quadrilineata. 

 h^ Three irregular rows of postbrachials, the median row 



much larger than the others undulata parva 



P No distinct median group of enlarged gulars. 



gi Second supraoculars divided longitudinally into several parts. 



septemlineata . 



g^ Second supraocular entire edracantha . 



e^ Six rows of ventral plates bridgesii. 



