16 REPTILES. 



I. Throat ivith two cross folds, the scales in the middle betiveen them 

 6-sided. Abdominal shields smooth. Tail rounded. Nostrils 

 hetu'cen two large nasal plates. 



a. Abdominal shields small, longer than broad: dorsal scales small 



equal. Teiina. 



1. Te I u s, ilierrem. Podinema and Ctenodon, PTa^^er. Tupi- 



nambis, part, Daud. Monitor, Fitz. Salvator, Dum. et Bib. 



Exypneustes, Kaup. 



Toes 5-5. Tail round. Teeth of youno^ adnate to the inner 

 side of the jaws, pectinated in front and 3-lobed on the side. 



As the animal grows, the base of the teeth becomes surrounded 

 by the bone of the jaw, and the front teeth lose their lobes and 

 become more rounded. 



The Teguexin. Teius Teg-uexim, Gray^ Ann. N. H. i. 276. 

 T. Monitor, llerrem, Tent. 61. Variegated Lizard, Shaw, Zool. t. 

 73. Lacerta Teguexin, Li7in. Mus. Ad. 45. S. N. i. 368. Tupi- 

 nambis Monitor, Baud. Ill, 20. Spix, R. B. t. 19. Seps mar- 

 moratus, Laur. Syn. 59. Seba, t. 96, f. 23. Pr. Max. Abbili. t. 

 from life. Monitor Meriana, Blainv. Bull. Soc. Phil. 1816,111. 

 Dum. et Bib. v. 85. Le Sauvegarde, Merian, Surin. t. 70, t. 4. 

 Teyongoucijou, Azara, Parag. 387. 



Green, black-varied, with 2 series of white spots on the i^pper 

 part of each side ; the cheek with 2 plates behind the nasal, the 

 hinder one being rather the largest, and followed by an arched se- 

 ries of square plates on the front of the eye ; the upper edge of 

 the temple with 4 or 5 small square equal shields ; the hinder la- 

 teral teeth of adult very large, rounded. 



a — c. Adult and half-grown, in spirits. Brazils. From M. P. 



Clausen's collection. 

 d — •/. Adult, stuffed. 

 g. Half-grown, stuffed. 



The Spotted Teguexin. Teius nigropunctatus. Tupinam- 

 bis nigropunctatus, Spix, Braz. t. 20. Dum. et Bib. E. Gen. v. 90. 

 Wagler, Syst. \5-d.—Seba, i. 150, t. 96, f. 2, 3. 



Green, black-varied, back with 6 series of white spots ; cheek 

 with only one plate behind the nasal, with a series of narrow 

 shields under the eyes, the first rather the largest and trigonal ; 

 the upper edge of the temple with 5 rather large square shields ; 

 the cheek-teeth 3-lobed ; gular shields large. 



a, b. Half-grown and younger, in spirits. The first suborbital 

 shield large to the middle of the third upper labial. 



c. Half-grown, in spirits, like a. Brazils. Presented by Lord 

 Stuart. 



