TACHIN0IDE8 IN BORNU PKOVINCt:, NOUTIlEKN NIGERIA. 



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very numerous, attacking the men vigorously. They also bit me freely through 

 white canvas leggings and khaki breeches. 



Walking along the river-bed, I noticed that the flies were numerous at certain 

 spots, while at others, none were seen. Wherever they were numerous, there was 

 always a pool of water near by, and I found the flies to be sheltering in the low 

 spreading straight-stemmed bushes, shown in the photograph (fig. 2), close to the 



Fig. 2. — River bed near Pyem ; tsetse-flies were observed to shelter specially in the bushes 

 shown on either side of the fore-ground. 



pools. On shaking these bushes, several more flies were seen, though we failed 

 to observe a single fly actually at rest upon them. After biting the men, the flies 

 disappeared, and it seemed impossible to discover their actual place of rest, but 

 it was obvious that they retired into these bushes, for on shaking them the flies 

 reappeared at once. We very carefully searched the sand and soft mud in the 

 vicinity of the bushes for pupse, but failed to find any. The small trees and 

 thorny bushes around did not appear to hai-bour any flies, for when shaken no 

 increase in the number of tsetses was observed. 



I had my table set down on the edge of a clear space some SOU ov 400 yards 

 from the river-bed, and thither the files followed me, and were so troublesome 



