PEEFACE. 



where sleeping sickness is now rife. Among these Mr. Austen 

 has determined one horse-fly {Tahanus sp. incert.), and ten 

 Tsetse-flies (five males and five females) of the species Glossina 

 palpalis, Rob.-Desv. 



This particular species of Tsetse-fly is essentially a West 

 African, species, known from the Gambia to the Congo. It 

 certainly suggests the need for an inquiry into the possible con- 

 nection between this fly and the sleeping sickness, when we 

 remember that that disease has been established for years on 

 the West Coast of Africa, but was unknown in Uganda until 

 two years ago. Sir Henry Stanley met with " Tsetse-fly " for a 

 long distance on the Upper Congo, and it is suggested by Mr. 

 Austen that Glossina palpalis reaches Uganda by way of the 

 valleys of the Congo and Aruwimi. 



E. RAY LANKESTEE. 



British Museum (Natural History), 

 Cromwell Road, London, S.W., 



May 15th, 1903. 



N.B. — Parcels intended for the Museum should be addressed 

 to The Director, as above, and should be accompanied by a 

 separate letter of advice. 



