46 H. T. BARRETT—DIARY NOTES ON THE TSETSE-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 oceasionally 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. palpalis. 
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.—Ep. } 
