349 
Experiments to Ascertain of Certain Tabanide Act as the 
Carners of Trypanosoma pecorum. 
By Colonel Sir Davip Bruce, C.B., F.R.S., A.M.S., and Captains A. E. 
HAMERTON, D.S.0O., and H. R. BaTemMaAn, R.A.M.C. (Sleeping Sickness 
Commission of the Royal Society, 1908-10). 
(Received December 20, 1910,—Read March 2, 1911.) 
[PuatE 16.] 
INTRODUCTION. 
The study of the trypanosome diseases of domestic animals in Uganda 
was a branch, and an important one, of the work undertaken by the 
Commission. Among other points arising in this investigation, the finding, 
if possible, of a carrier of the various trypanosome diseases was necessary. 
In the ‘Proceedings’* of the Royal Society, the Commission published a 
paper entitled “Trypanosome Diseases of Domestic Animals in Uganda. 
I.— Trypanosoma Pecorum.” This paper gives full details as to the definition, 
morphological and cultural characteristics, and distribution in Africa, of 
Trypanosoma pecorum. A few experiments and experiences of the Com- 
mission were also given, which led to the belief that possibly Tabanidee 
were the common carriers in Africa of the disease caused in cattle by this 
trypanosome. 
With the object of gaining further knowledge on this important problem, 
the Commission worked in Uganda from January to July, 1910, on the 
following lines :— 
1. An investigation of the biting flies occurring in the vicinity of the 
laboratory at Mpumu, Chagwe, Uganda. 
2. A study of the natural history of these biting flies. 
3. Transmission experiments with these flies. 
4, A study of the flagellates, if any, natural to these flies. 
1. AN INVESTIGATION OF THE BITING FLIES OCCURRING IN THE VICINITY 
OF THE LABORATORY AT Mpumu, CHAGWE, UGANDA. 
No systematic search was made for blood-sucking flies in this neigh- 
bourhood till January, 1910. Up to this date the Commission had identified 
some four different species in the vicinity of Mpumu. 
An outbreak of trypanosome disease in cattle having occurred in 
| * B, 1910, vol. 82, p. 468. 
