624 CROTALID.E. 



Genus TRIGONOCEPHALUS. 



305. Trigonocephalus lanceolatus , Oppel. Rat-tailed Serpent. 

 Hob. St. Lucia, West Indies. 



a. Presented by His Excellency G. W. Des Voeux, C.M.Z.S., 

 April 13, 1871. See P. Z. S. 1871, pp. 2, 479. 



306. Trigonocephalus atrox (Linn.). Deadly Snake. 

 Hob. Brazil. 



a. Presented by Dr. A. Stradling, C.M.Z.S., March 19, 1881. 



Genus LACHESIS. 



307. Lachesis mutus, Daud. Surucucu or Bush-master. 

 Hab. Brazil. 



a. Presented by C. A. Craven, Esq., July 27, 1881. From 

 Pernambuco. 



