19 



A SUMMARY OF AN ENTOMOLOGICAL SURVEY OF KADUNA DISTRICT, 



NORTHERN NIGERIA. 



By J. E. L. Johnston, M.B., B.S. (Lond.), D.T.M. & H. (Camb.), 

 West African Medical Staff. 



Kaduna, tlie future capital of Nigeria, is situated in the Northern Provinces on the 

 River Kaduna, at an elevation of roughly 2,200 feet. The present Kaduna is a small 

 station (Kaduna Bridge) south of the river, but the capital now in the process of 

 construction is some two or three miles to the north, near the small native town of 

 Doka. 



Being instructed to make an Entomological Survey of the district, with especial 

 reference to Glosdna and the resulting presence of trypanosomes in cattle, I left La^os 

 on 30th July 1914, reaching Kaduna Bridge on 1st August. ° 



Kaduna Bridge. 



I decided to remain some days at Kaduna Bridge, examining the place and its 

 immediate neighbourhood, then to move to the site of the new Kaduna (the native 

 town of Doka) on the other side of the river, and after a few days there to start on a 

 tour in a circle round Kaduna. 



It became immediately obvious that there were very few flies to be obtained in 

 either the old or the new Kaduna. It is probable that this was largely due to the 

 unusual weather conditions. Table I. shows the rainfall for 1913, and for 1914 up to 

 the end of August. 



Table I. 



1913. 



1914. 



^ .^?°^ ^* ^""'^^ ^® ^^^^ *^^* ^^ July and August 1914 there were only 1-84" and 



ro9 as compared with 11-81" and 11-53" for the same months of 1913, and for the 



first eight months of the year there were only 20-39" in 1914 as compared with 36-64" 



(C250) 



b2 



