26 



J. E. L. JOHNSTON. 



than one parasite. Bacillary forms were common, as were thicker forms intermediate 

 between the bacillary and ring-shaped types. These various types were occasionally 

 to be seen in one film. 



A list of the blood-sucking flies and ticks obtained is appended. I saw a fair number 

 of large Tabanidae which I was unable to catch. 



1 was unfortunate in losing a large number of mosquitos, chiefly from Kaduna 

 Bridge, owing to the boxes containing them being attacked by ants. It will be seen 

 by reference to the following Table that by far the commonest mosquito was 

 Culiciomyia nebulosa (51-85 per cent.), that Anopheles costalis and Culex duttoni each 

 amounted to 14-19 per cent., and that the remaining 19-7 per cent, was formed by ten 

 different species. 



Table II. 

 Showing percentages of Mosquitos caught. 



*In addition to these 14 specimens were bred. 

 t56 specimens were bred. 



I am very much indebted to the District Officer (Mr. A. C. Francis), tlie Senior 

 Medical Officer (Dr. H. P. Lobb), and the Assistant Engineer (Mr. J. Sutherland- 

 Brown) for great assistance throughout my tour ; to Mr. S. A. Neave, of the Imperial 

 Bureau of Entomology, for kindly identifying the Tabanidae; to Professor 



