206 PROCEEDINGS OP THE ACADEMY OF 



group, and, towards the close of the same year, the writer named 

 a third. Prof. Peters subsequently named another genus which 

 may be retained, thougli in a sense quite different from that in 

 which it was originally intended. I allude to Bothriopsis, first 

 defined by the four small scuta on the top of the muzzle of one of 

 the species, a character not worthy of such a valuation. The char- 

 acters adopted will be seen below. All the known species are 

 found between North Mexico and Peru. 



I. Head scaled above. 



a. Body compressed, tail prehensile (arboreal) . 



A series of liorn-like scales above the eye, outside of the superciliary shield. 



Teleukaspis. 

 Superciliary reaching to the edge of the eye opening, no horns. 



BOTHRIECHIS. 



aa. Body cylindric, tail straight (terrestrial). 



Nasal plate one. Porthiditjm. 



Nasal plates two. Bothriopsis. 



II. Head with nine plates above. 



Body cylindric ; two nasals. Ancistrodon. 



TELEUKASPIS, Cope. 

 Proceed. Acad. Nat. Sci., Phila., 1859, 338; 1860, 345. 



The species of this genus are few, and are so far only known 

 from the Isthmus of Darien and west of the Andes to Peru. 



Teleuraspis schlegelii, Berthold, Abh. wiss., Gottingen, 1847, iii. 13 (^Trigonocepha- 

 lus). Cope, Pr. A. N. Sci., 1859, 338 ; 1860, 345. 



From Veragua and Darien. 



Teleuraspis nitida, GUnther, Proc. Zool. Soc, London, 1859, Nov. Tab. (Lackesis). 

 Cope, 1. c. 345, et 1868, 110. 



Equador. 



Teleuraspis nigroadspersus, Steindachner Sitzungsber. Wien. Academie, 1870, May, 

 pi. viii. 



This species is near the last, especially to a bright j'ellow va- 

 riety of it. It differs, according to its describe!', in the two nasal 

 shields, and the fewer superciliary horns. 



Central America. 



[October 24, 



