APPENDIX. — SNAKES. 247 



Page 48. Erythrolamprus venustissimus. Add : 



Var. E. Head and neck black ; body entirely white, with a 

 dorsal series of large black spots ; scales of the back with black 

 tips; tail with pairs of black rings. 



k. Adult. America. Presented by the College of Surgeons. 



Page 49. Hypsirhynchus ferox. 



Add to the end of the description : — There are now several 

 snakes known from Barbadoes. 



Page 54. Xenodon severus. 

 Var. A. Adult. 

 c'. Para. From M. Bazali's Collection. 



Var. C. Adult. 

 g'. South America. From the Collection of the Zoological So- 

 ciety. 

 g". Guayaquil. From Mr. Eraser's Collection. 



Young specimen, 

 g'". Guayaquil. From Mr. Fraser's Collection. 



Page 63. Tropidonotus hydrus. 



h. Adult. Sine patria. From the Collection of the Zoological 



Society. 

 i. Young. Sine patria. From the Collection of the Zoological 



Society. 



Page 67. Add : 6 a. Tropidonotus punctulatus. 



Scales in seventeen rows ; anal bifid ; nine upper labials, fourth 

 and fifth coming into the orbit ; one anterior, two posterior ocu- 

 lars. Blackish ash above, each scale of the two outer rows with 

 a white spot, forming together a lateral band. 



a. Adult. Sine patria. From the Collection of the Zoological 

 Society. 



Description of the specimen. — In habit similar to T. natrix. 

 Rostral shield reaching the surface of head; anterior frontals 

 triangular, rather pointed in front ; vertical more than twice as 

 long as broad, with nearly parallel outer edges, and a right angle 

 behind ; occipitals rather narrow and pointed behind ; anterior 

 ocular and loreal large, the lower posterior ocular very narrow 

 and elongate, forming a part of the hinder and a part of the 



