AN ENTOMOLOGICAL SURVEY OF KADUNA DISTRICT. 



2:) 



in the gut of S. nigra. On the other hand, Glossina seldom travel far from a stream 

 (unless following cattle, e.g. down a railway), and it is more than probable that the 

 infected cattle were bitten near one or other of the many streams mentioned. The 

 cattle are every day driven far out into the bush for pasturage, and they are bound in 

 a short time to visit the banks of some stream. Moreover the Fulani cattle-owners 

 are migratory and seldom live at any one spot for more than a few months. 



Films were taken from 150 head of cattle in all, and of these 19 (12-6 per cent.) were 

 infected with trypanosomes, while no less than 39 (2G per cent.) showed piroplasmata. 



Of the twelve sheep examined one was infected with piroplasmata, but none with 

 trypanosomes. 



Afaka 



Ubassa 



qNbw , 



Kadi 



♦>"'»> Birnawa 

 * 



'Kaduna Bridge 



\Kakuri 



• J^^^ Hurmin haauna 



Togachi 



•Buga 



> Kujama 



p'' 



y 



igai 



•Kudemsa 



f^ 



,0 



10) 



9A 



Fig. 2. Sketch-map of the country round Kaduna Bridge. The asterisks indicate 

 the presence of tsetse-fiies or of cattle infected with trypanosomes. 



The trypanosome causing infection in most cases was of the T. vivax t>3)e. 



The piroplasmata showed great variation in shape and size. Some were large 

 pyriform bodies, often with two chromatin dots, or several minute chromatic granules ; 

 some were rings, sometimes extremely minute, sometimes fairly large, showing well- 

 marked chromatin. Occasionally there was a large, more or less confused mass of 

 protoplasm and chromatin, which in some instances could be seen to consist of more 



