608 COLUBRID.E. 



Genus TRETANORHINUS. 



234. Tretanorhinus nigroluteus, Cope. Black-and- Yellow Snake. 

 Hab. Central America. 



a. Purchased, Sept. 12, 1871. From Monkey Hill, near 

 Colon. See Giinther, Ann. & Mag. N. H. ser. 4, vol. ix. 

 p. 27. 



Genus HETERODON. 



235. Heterodon platyrhinos, Lath. Hog-nosed Snake. 

 Hab. North America. 



a. Presented by Dr. F. Painter, F.Z.S., May 17, 1877. 



236. Heterodon d'orbignyi, Bum. & Bibr. D'Orbigny's Snake. 

 Hab. South America. 



a. Purchased, Oct. 24, 1878. 



b. Presented by Dr. A. Stradling, C.M.Z.S., June 21, 1881. 



237. Heterodon madagascariensis, Dum. & Bibr. Sharp- 



snouted Snake. 



Hab. Madagascar. 



a. Presented by E. Newton, Esq., C.M.Z.S., Nov. 27, 1863. 



Genus PITUOPHIS. 



238. Pituophis catenifer (Blainv.) . Chained Snake. 

 Hab. California. 



a. Presented by A. Forrer, Esq., Aug. 20, 1873. 



Genus RHINECHIS. 



239. Rhinechis scalaris, Schinz. Back-marked Snake. 

 Hab. Southern Europe. 



a. Purchased, June 9, 1879. 



6. Presented by G. A. Boulenger, Esq., July 1, 1882. 



