viii. Introduction. 



disease by means of blood-sucking flies other than Mosquitoes and 

 Tsetse-FHes, the British have as yet lagged somewhat behind other 

 nations. Should the present volume have the effect of facilitating 

 such studies, and of drawing attention to the urgent need for work 

 of this kind in our African Colonies and Protectorates, there will be 

 much cause for congratulation. 



ERNEST E. AUSTEN. 



British Museum (Natural History), 



Cromwell Road, London, S.W. 

 July I2th, 1909. 



