1912.; 



T. pecorum {Bruce) and T. uniforme [Bruce). 



561 



Expt. 

 No. 





Number of flies. 



Duration 

 days. ! 



Period flies fed on Antelope. 



1st 30th -p.. .j Containing 

 day. day. Dlssecte(L flagellates 



464 

 528 

 529 

 706 

 707 



Oct. 10—18, 1911, on Situtunga 173 

 Nov. 21—28, „ „ 173 

 Nov. 22—28, „ „ 173 

 Apr. 11—17, 1912, on Situtunga 173 

 Apr. 12—17, „ „ 173 



57 J 47 55 1 

 104 84 104 2 

 93 62 93 ! 

 86 58 j 86 | 3 

 61 47 61 2 



41 i 

 55 j 



50 I 

 49 



In all the positive flies of the above experiments trypanosoines were only 

 found in the proboscis. 



It is impossible to know when Situtunga 173 became infected, but reckoning 

 from its arrival at the laboratory on June 25, 1911, it will be seen that the 

 animal was still capable of infecting laboratory-bred G. polpalis with 

 T. uniforme after a period of 10 months. 



During this time the animal has remained in excellent health, though 

 confined under by no means ideal conditions. 



The question of wild antelope in tsetse regions serving as a trypanosome 

 reservoir thus becomes increasingly important. In this Protectorate alone 

 T. gambiense, vivax, pecorum, and uniforme have all been proved capable of 

 surviving for a considerable time in these animals, apparently without 

 exerting any injurious effect upon their hosts. 



In other parts of Africa T. rhodesiense, brucei, congolense, and nanum have 

 been recovered from game. 



This is not the place for a discussion on the significance of the problem 

 from an administrative point of view. Extermination of the game in Africa 

 is a colossal undertaking, and until something more is known concerning the 

 role played by birds and reptiles in the spread of trypanosomiasis it would 

 seem inadvisable to set too much faith in this drastic measure. 



