LIZARDS. 195 



Scales of the back close-pressed, unequal, ^\^tll cross series of 

 conical keeled scales, an arched series of large keeled scales across 

 the shoulders and haunches, a little above the base of the legs, a 

 group of 5 or 6 large scales, forming a prominent tubercle at the 

 upper end of the ear ; orbit with small granular scales. 



a. In spirits. Mexico. Presented by J. E. Gray, Esq. 



*** Back crested. Head short, simple, rounded behind. Toes 



simple, slender. 



20. Enyalius, W<igler. Uraniscodon, part, Kaup. Lophyrus, 

 part, Spix. Xiphosurus, part, Gray. 



Head short, covered with equal, convex, small, polygonal 

 plates. Eyebrows and temple with small granular scales. Skin 

 of the throat slightly dilatable, with a fold on the chest. Back 

 crested, with small convex roundish scales. Belly with square 

 keeled scales. Limbs and tail with lozenge-shaped truncated 

 keeled scales. Tail rounded, elongate, slender, angular beneath 

 and at the tip, not crested. Palate toothed. Teeth 3-lobed. Fe- 

 moral pores none. Toes slender, simple, elongate, unequal, co- 

 vered with rhombic keeled scales above and on the sides, and with 

 a series of narrow 2-keeled rough hexaugular scales beneath, not 

 fringed on the sides, the hinder outer toe quite free at the base. 



•*■ Scales of hack small, convex. 



The LozENGE-MARKED Enyalius. Enyalius rhombifer, Wag- 

 ler, Sys. 150. Dum. et Bib. E. G. iv. 231. Lophyrus rhombifer, 

 ASpix, Braz. 9, ^. 11. L. albomaxillaris, Spix, Braz. i\,t. 13,/. 

 3, (very young). L. margaritaceus, Spix, Braz. 10, ^. 12,/. 1 ? 

 Gray, Griffith, A. K. ix. ? L. Braziliensis, Lesson, Voy. Coqu. 

 Rept. t. 1,/ 3 ? Gray, Griffith, A. K. ix. 40. Agama catenata, 

 Nieuw. Abbild. t. ? Schinz. Rept. t. 25, f. 1 ? lost scales of back. 



Scales small, nearly equal, of the supraorbital region very 

 small, in 12 longitudinal series, of the abdomen square ; brown, 

 mth a series of white-edged brown rhombic spots on the back ; 

 chin with 2 diverging series of 3 flat 6-sided scales. 



a, b. Adult and half grown, in spirits. Scales of the front of the 

 abdomen square. Brazils. From Dr. Gardiner's collection. 



c. Half grown, in spirits. Scales of the front of the abdomen ra- 



ther 6-sided, of the back square. Brazils. Presented by Lord 

 Stuart. 



d. Stuffed, half grown. Olive. S.America. 



S 2 



