46 H. T. BARRETT DIARY NOTES ON THE TSETSK-FLIES, &C. 



The statement so often made that sun is the chief enemy of the tsetse appears 

 to be unfounded, at least as regards the species met with. On dull days the fly 

 were remarkably scarce ; on the other hand in dry country with practically no 

 shade, fly were most troublesome during the hottest hours of the day in blazing 

 sunshine. When fly were not attacking they generally appeared to rest either 

 on the ground or very near to it. 



The fly met with in the Chualezi valley appear to be of a different Species to 

 those met with elsewhere. They are smaller, and their habit of nocturnal feeding 

 is peculiar, as is also that of crawling considerable distances inside the clothing. 



[The collection of 65 tsetse-flies brought home by Mr. Barrett comprises only 

 a single species, namely, Glossina morsitans. The interesting differences in 

 habits which were noted are not correlated with any colour or structural distinc- 

 tions. It has long been known that G. morsitans will bite on moonlight nights, 

 and occasionally even when there is no moon. The habit of crawling inside 

 clothing does not appear to have been recorded previously in the case of this 

 species, though well-known in G. j)alpalis. 



The suggestion that G. morsitans specially associates with waterbuck requires 

 confirmation, for the evidence cannot be regarded as sufficiently conclusive. 



The country traversed by the author is hardly known at all to Europeans, and 

 his notes and specimens have therefore a special interest. It is not often that 

 travellers with no knowledge of entomology will take the trouble to make exact 

 observations of this kind. — Ed.1 



