8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 119 



37. Ventral scales keeled 38 



Ventral scales smooth 39 



38. Femoral pores present Kentropyx 



Femoral pores absent Monoplocus 



39. Ventral surfaces of limbs and tail pale, contrasting strongly with the dark 



belly 40 



Ventral surfaces of limbs and taU dark, not contrasting strongly with venter of 

 body Ameiva 



40. Patch of enlarged scales medially on throat between the angles of jaw (fig. 4a) ; 



all supraoculars in contact with central head shields; males with heavy 



spines on sides of anus Ameiva 



No enlarged patch of scales medially on throat between angles of jaw (fig. Ab); 

 last two supraoculars separated from frontal and frontoparietal by row 

 of granules; males with no heavy anal spines Dicrodon 



41. Five toes on forefoot 42 



Fewer than five toes, if any, on forefoot 57 



42. No gi-eatly enlarged dorsal and ventral scale rows 43 



Dorsum and venter •vnXh two rows of extremely broad scales, separated laterally 



by four rows of scales Iphisa 



43. A claw on every finger 44 



Innermost finger lacks a claw Calliscincopus* 



44. No prefrontals (fig. 4c) 45 



Prefrontals present (fig. 4«^) 47 



Figure 4. — Scales medially on throat between angle of jaws: a, Ameiva edracantha; b, 

 Dicrodon guttulatum. Dorsal view of head: c, Pholidobolus montium; d, Neusticurus 

 strangulatus. 



45. Dorsals hexagonal or subhexagonal 46 



Dorsals rectangular Proctoporus 



46. No clear separation between ventrals and dorsals Macropholidus 



Dorsals and ventrals separated by two or more rows of granular scales 



Pholidobolus 



47. Dorsal and ventral scales similar, quadrangular; dorsals in transverse and 



longitudinal rows 48 



Dorsal scales not arranged in longitudinal rows 49 



