278 



Trypanosoma Diseases of Domestic Animals in Nyasaland. 

 II. — Trypanosoma caprae (Kleine). 



By Surgeon-General Sir David Bruce, C.B., F.B.S., A.M.S. ; Majors David 

 Harvey and A. E. Hamerton, D.S.O., B.A.M.C. ; Dr. J. B. Davey, 

 Nyasaland Medical Staff;* and Lady Bruce, K.R.C. 



(Eeceived January 13, — Read March 6, 1913.) 



(Scientific Commission of the Royal Society, Nyasaland, 1912.) 



[Plate 5.] 



Introduction. 



This species belongs to the vivax group, which consists of three species : — 

 Trypanosoma uniforme, T. vivax, and T. caprce. They are all characterised by 

 their extreme motility ; clear cell contents ; large, round, terminal micro- 

 nucleus ; and lastly, by the fact that the vivax group only infects cattle, 

 goats, and sheep, and is harmless to the smaller laboratory animals. All 

 three develop in the proboscis of the tsetse flies and not in the alimentary 

 tract, as do other pathogenic trypanosomes. 



T. vivax is stated to be pathogenic to horses, mules, and donkeys, but there 

 has been no opportunity of testing these animals at Kasu with T. caprce. 



It is curious that T. uniforme and T. vivax have not been met with by the 

 Commission in Nyasaland. This may be due to the absence of Glossina 

 palpalis, which is their carrier, while T. caprai is carried by 67. morsitans. 



Morphology of T. caprce. 



A. Living, Unstained. 



The description given of T. vivax can be equally applied to this species. 

 It is just as active in its movements and dashes across the field of the 

 microscope with the same impetuosity. 



B. Fixed and Stained. 



The blood films were fixed, stained, and measured as previously described 

 in the ' Proceedings.'! 



* Dr. Davey resigned his membership of the Commission in October, before the 

 completion of the work here recorded. 



t 'Roy. Soc. Proc.,' 1909, B, vol. 81, pp. 16 and 17. 



