iv PREFACE. 



the liberty we have taken. We have likewise to express our high 

 estimation of the valuable notes which we have extracted from 

 the published writings of the late Henry Durnford and Ernest 

 William White, both most promising Naturalists, and both alike 

 lost to Science at an early age. Nor must we omit to record our 

 thanks to Hans, Graf von Berlepsch, of Miinderi, Mr. Walter 

 B. Barrows, and Mr. Frank Withington, and other friends and 

 correspondents who have aided us by information and by the loan 

 of specimens. 



To the Zoological Society of London and to Mr. Henry 

 Seebohm we are likewise much indebted for the loan of the wood- 

 cuts of which impressions are contained in these volumes. 



P. L. S. 

 February \, 1889. 



