N 1923 6 ] AMARAL — NEW GENERA AND SPECIES OF SNAKES 105 



characteristics. It differs from B. peruviana (Blgr.) l because 

 of the non-prehensile tail, lower number of scale rows and ven- 

 trals, and snout and rostral shape. Nos. 8832 and 8833 had 

 been identified with B. lanceolata (Lacep.) by Thomas Barbour 2 

 in 1913. But it can be easily separated from B. atrox (L.) 3 (of 

 which B. lanceolata (Lacep.) 4 is a strict synonym according to 

 my opinion), which occurs too in Peru, whence the U. S. Na- 

 tional Museum has a specimen, collected at Rio Cosireni by E. 

 Heller. The number of ventrals of atrox ranges from 190 to 

 231 or more; the scale rows from 23 to 33; and the scales have 

 short and very high keels. 



i G. A. Boulenger, Ann. Mag. Nat. Hist., (7), VII, 1903, p. 354. 



2 Thomas Barbour, Reptiles collected by the Yale Peruvian Expedition of 1912. Proc. 

 Acad. Nat. Sci. Phila., Sept., 1913, p. 507. 



a LinnS, Systema naturae, 10th ed., 1858, T. 1, p. 222, no. 263. 

 « Lacepede, Serpents, 1789, Vol. 2, pp. 80, 121, pi. V, fig. 1. 



