296 CLASS XV. 



species are of a considerable size. With Merrem they form the 

 genus Tejus. 



Crocodilurus Spix (add Thorictls Wagl. and Neusticurus 

 DuM. and Bibk.), Tail compressed, with a double crest above, 

 serrate, Avitli scales erect. Palate edentulous. Pores femoral or 

 inguinal. Head scutate. 



Neusticurus Dum., Bibr. Back covered with lesser scales and 

 with scutiform, carinate scales. Gvilar fold single, of larger scales. 

 Row of pores continuous along the inner surface of whole thigh. 

 Aperture of nostrils small in the middle of scute. 



Sj). Crocodilurus bicarinatus nob., Laccrta bicarincUa L. (according to 

 Dumjeril), Draccena bicarlnata Gubrin Iconogr., Rcpt. PL 3, fig. 2, Dum. 

 ct Bibr. Erpet. v. PI. 49 ; from Soutli America, probably Guyana. 



Thorictis Wagl., Draccena Daud., Ada Gray. Back covered 

 with large, scutiform, carinate scales, with smaller scales inter- 

 spersed. Subgular fold double. Pores inguinal. Aperture of 

 nostrils orbicular, placed in the suture of two scuta. Posterior 

 teeth hemispherical, subflat. 



Sp. Crocodilurus Draccena nob., Thorictis Draccena Dum. Bibr., la Dragonne 

 Lac, Quadr. ovip. i. PI. 16, Daud. ii. PI. 28; Cuv. H. Aoii., ed. ill., Rept. 

 Pi. 10 bis, fig. 2; this animal becomes more than 2' 5" long, and lives in 

 South America in marshy regions ; not only the tail, but the entire cover- 

 ing of the body, resembles, to a certain extent, that of the crocodiles. 



Crocodilurus Spix. Back covered with small scales obtusely 

 carinate, oblong. Gular fold double. Femoral pores small. 



Sp. Crocodilurus amazonicus Spix (and ocellatus ejusd.), Spec. nov. Lac. 

 Brasil. Tab. 20, 21; Brasil, Guyana. 



Tejus Merr. (in part). Tail conical. Head scutate. Kow 

 of pores in inner part of thighs. 



Centropyx Spix., Trachygaster Wagl. Abdominal scales imbri- 

 cate, carinate, with keel produced posteriorly into a sharp point. 



Sp. Centropyx calcaratus Spix, Wiegm., Guer. Icon., Rept. PI. 4, fig. 3; 

 Brasil, Surinam. 



Tejus nob. Scales of abdomen quadrangular, smooth. 



Sp. Tqus Amciva Maxim. Abb. zur Naturgesch. Bras., Lief. V, Spix Nov. 

 Spec. Lacert. Tab. 23, Guekin Iconogr., Rept. PI. 4, fig. i; distributed 



