34 6 



1 '. brucei are also less extensive. The posterior end of 

 T. brucei is also blunter than that of T. evansi. The 

 free portion of the flagellum is shorter in T. brucei than 

 T. evansi, and the protoplasm of T. brucei has more 

 numerous and larger granules than that of T. evansi. 

 The nuclei and the blepharoplasts are morphologically 

 indistinguishable. Further, the mean length of T. 

 brucei is less than that of T. evansi, and the width of 

 T. brucei is greater. The distinction between Surra 

 and Ngana is, however, best proved by the fact that 

 an animal immunized against Ngana is yet susceptible 

 to inoculation with Surra. 



Pathology. The spleen is enlarged and there is 

 general glandular enlargement. 



Transmission. Rogers got positive results by 

 means of Tabanidae. Stomoxys sp. has been suspected, 

 but there are no positive experimental data. 



El Debab (= Surra). A disease of camels in 

 Algeria, is transmitted by Atylotus nemoralis and 

 A. tomemtosus. 



Mbori (= Surra). A disease of Sudan camels, is 

 transmitted by Tab anus ditaeniatus and T. biguttatus. 



Aino. A trypanosomiasis of camels in Somaliland, 

 is also possibly Surra. Likewise T. vivax affecting 

 cattle, sheep and goats in the Cameroons is, according 

 to Laveran and Mesnil, Surra. 



Cultivation. Is even more difficult than in the 

 case of T. brucei. Novy and McNeal state that Surra 

 from the Philippines does not form rosettes in culture 

 like T. brucei) whereas Laveran and Mesnil with the 

 Mauritius Surra obtained them. It is possible, then, 

 that these also are varieties. 



4. T. equinum.Tht cause of Mai de Caderas, a 

 disease of horses in Central and South America. 



Symptoms. (i) Remittent fever ; (2) Progressive 



