380 XEIID^. 



a, o . Rio Graude do Sul. Dr. v. Ilieriug [C.]^ 



l_c, J . Dept. of Soriauo, Uruguay. R. Havers, Esq. [P.]. 



f/-?.'(^,'?,bgr.,&yg. Uruguay. 



k Y^ MoDtevideo. C. Uarwm, Esq.[P.]. 



Ir-n Hot rT.2. Montevideo. Dr. Cunmngkam rpj. 



OS S. America. B. Bynoe, Esq. [P.]. 



* ^" ? 0. Darwin, Esq. [P.]. 



q. 5 ,' skeleton. S. America. Berlin Museum. 



10. CROCODILURUS. 



Tupinambis, part., Daud. Rept. iii. p. 5. 



Crocodilurus, Spix, Sjjec. Nov. Lacert. Bras. p. 19; Wagler, Syst. 



Amph. p. 153 ; Wtegm. Herp. Mex. p. 8 ; Durn. i^- Bibr. v. p. 42 ; 



Gray, Cat. p. 25. 

 Custa, Fleming, Philos. Zool. ii. p. 274. 

 Ada, part., Gray, Griff. A. K. ix. Syn. p. 28. 



Tongue moderately elongate, not retractile, widened and emargi- 

 nate posteriorly. Lateral teeth compressed longitudinally, bi- or tri- 

 cuspid. Head with large regular shields ; nostril pierced in the 

 suture between two nasals. Eyelids developed. Ear exposed. 

 Limbs well developed, each with five digits, the toes with a denti- 

 culated fringe laterally, inferiorly with small squarish scales. Dorsal 

 scales small, equal ; ventral plates large, elongate, subquadran- 

 gular, smooth, forming regular series. A collar fold. Femoral 

 pores. Tail strongly compressed, with a double denticulated keel 

 superiorly. 



Guianas, Brazil. 



1. Crocodilurus lacertinus. 



Crocodilurus lacertinus, Gray, Cat. p. 25. 

 Tupinambis lacertinus, Daud. Eept. iii. p. 85. 



Crocodilurus amazonicus, Spi.v, Spec. Nov. p. 19, pi. xxi. ; Wagl. 

 Icon. Amph. pi. xv. 



ocellatus, Spix, I. c. p. 20, pi. xxii. fig. 1. 



Teius (Ada) bicarinata [non L.), Gray, Griff. A. K. ix. Syti. p. 29. 

 Crocodihu-us lacertinus, Du7n. Sf Bibr. v. p. 46. 



Habit of a Varanus. Tpper head-shields : a fronto-nasal, a pair 

 of prefrontals, a frontal, a pair of frontoparietals, a large interpa- 

 rietal, a pair of parietals and a pair of occipitals ; one or two small 

 shields between the interparietals and occipitals ; four large, and a 

 small posterior, supraoculars ; two large supratemporals on each side ; 

 a loreal, a prseorbital, six or seven infraorbitals ; eight upper and 

 seven or eight lower labials ; chin-shields, one anterior and six pairs, 

 the posterior separated from the labials by another row of large 

 shields ; gular scales small between the chin-shields, large and sub- 

 hexagonal on the throat ; the scales in front of the collar-fold larger. 

 Dorsal scales small, elongate, oval, slightly keeled or tectiform. 

 Abdominal plates with the posterior border rounded, in twenty-four 

 longitudinal and thirty-seven transverse series. Praeanal plates in 

 three transverse series, the median posterior pair largest. Femoral 



