2^8 Mr. Gray on the Sktiulvr-toiiyiu'd Saurians. 



pale central streak, commencing with a point in the nape, and gra- 

 dually increasing in width to the thighs, with two wide black and 

 two very narrow white lines on each side of it, and the lower part 

 of the Bides with two series of bluish spots ; abdominal plates 10- 

 rowed, lateral ones bluish-spotted. 



Inhab. South America, Jamaica. 



Ameiva lineata. A. ccerulescephala, Cuv.} Baud, from Seba, i. t. 

 91. f. 3. Bluish; back with 5 broad, dark, and 6 narrow, bluish 

 white lines; aides white-spotted ; belly greenish ; abdominal plates 

 8-rowed ; preeanal plates 5. 



Var. 1 . The dark vertebral streak divided into two by a narrow 

 central pale one. 



Var. 2. Upper part of sides with an additional pale streak. 



Var. 3. Younger; sides not spotted; back and sides with 10 li- 

 near, pale streaks. Lac. Lemniscatus, Linn. Am. Lemniscata, Cuv. 

 from Seba, i. t. 92. f. 4. 



Inhab. — — — . 



** Throat with a collar of large shields. 



a. The collar and ventral shields lanceolate, imbricate, keeled; thighs 



beneath scaly ; nostrils between two nasal plates ,- tail round. 



Acanthopyga. Pseudoameiva, Fitz. Scales of the back large, 

 keeled ; keels continuous ; of the sides small, granular. 



Acanthopyga striata. Lacerta striata, Baud. Merrem. Wetter. Ann. 

 i. t. 1. Pr. Max. t. 13. Guerin, Icon. t. Kentropyx striatus, Fitz. 



Inhab. Brazils. 



Centropyx. Trachygaster, Wagler. Acanthopyga, Leach. The 

 scales of the back moderate, ovate, keeled ; of the sides rather smaller ; 

 of the belly very large. 



Centropyx calcaratus. 



b. The ventral shields 4-sided, smooth, as long as broad ; nostrils in 



the centre of a trigonal nasal shield ; tail compressed. 



Ada, Gray. Draccena, Daud. Thorictis, Wagler. Scales of the 

 back unequal, larger ones oval ; tail with a serrated crest on each 

 side above. " Teeth on the edge of the jaw." 



Ada Crocodilurus . Teius Crocodilurus, Merrem. Dracaena Gui- 

 nensis, Daud. Lacerta Dracaena, Bonnat. 



South America. 



Crocodilurus, Spix. Scales of the back equal; "teeth on the 

 inside of the jaws ;" rest like Ada. 



Crocodilurus amazonicus, Spix. Braz. 



