20 



ELAPIDjB. 



Elaps surinamerms Cuv. 



Ckotalid*. 



Botlirops alternatus D. & B. 

 Crotalu8 terrificus Lau 



LACERTILIA. 



iGUANIDjiE. 



Polyehrus angustirostris Wagl. 



ANGUIDjE. 



Opheodes striates Spix. 



Teid^e. 



Tupinnmbis teguex n Linn. 

 Tents fe»/0M Daud. 



Scincid.k. 

 Mabuia dorsivittata Cope. 



CROCODILIA. 



Crocodilim:. 



Jacare latirostris Wagl. 

 ■" sclerops Wagl. 



o species. 



Total, 



2 species. 



32 species. 



NOTE. 



Eunectes not^ius Cope. Proceeds, Academy .Nat. Sci., Phila., 1862. 

 p. 69. Plate I, Figure 3. 



Since my description of the Southern anaconda, thirty-three years 

 ago, it has remained unnoticed' by authors, until in the addenda of the 

 last volume of the catalogue of the species of snakes in the British 

 Museum it is mentioned. Previously but one species of Eunectes, the- 

 common anaconda, E. murinus L., had been admitted. The localities 

 from which the specimens of this species in the British Museum were 

 obtained, are all, according to the catalogue, from the Guianas, Brazil 

 and northeastern Peru. The four specimens of the E. notceus which 

 have thus far come under my observation are from the drainage region 

 of the Paraguay River, as is also the single one referred to in the ad- 

 denda of the British Museum Catalogue. 



The characters which I pointed out as distinguishing the Paraguayan 

 from the Northern anaconda I find to hold good. The circle of plates 

 surrounding the eye rest immediately on the labial plates, there being- 

 no intervening row as in E. murinus, except that on one side of one 

 specimen two narrow scales intervene, but do not continue so as to 

 complete the separation. The anterior labial plates are not so elevated 



