Page 



46. A List of the Snakes of Novth-East Africa, from the 



Tropic to the Soudan and Somnliland, including 

 Socotra. By G. A. Boulenger, F.R.S., F.Z.S. 641 



47. Descriptions of a new AinpMshcena and a new Snake 



discovered by Dr. H. G. F. Spurrell in Southern 

 Colombia. By G. A. Boulenger, F.R.S., F.Z.S. 

 (Text-figures 1 & 2.) 659 



48. The Distribution of Secondary Sexual Characters 



amongst Birds, with relation to their Liability to the 

 Attack of Enemies. By J. C. Mottram, M.B.(Lond.) 663 



49. Some Observations on Pattern -Blending with reference 



to Obliterative Shading and Concealment of Outline. 



By J. C. Mottram, M.B.(Lond.). (Text-figures 1-5.) 679 



50. On some Land - Planarians collected in Western 



Australia and Tasmania by Members of the British 

 Association for the Advancement of Science. By 

 Arthur Dendy, D.Sc, F.R.S., F.Z.S., Professor of 

 Zoology in the University of London (King's College). 693 



Alphabetical List of Contributoi's ix 



Index XV 



