22 



Sir D. Bruce and others. G. brevipalpis as a 



In 50 flies seven contained recognisable blood. This in six cases was 

 antelope blood, in the seventh probably human. 



It is curious the great preponderance of males over females. It seems to 

 be a habit of the former to frequent paths in the evening, while the females 

 presumably hide in the thick jungle. The same thing obtained to a lesser 

 extent with G. morsitans. Among all the G. brevipalpis dissected at the 

 laboratory, amounting to several hundreds, only four females were found. 



II. Dissection of Wild G. brevipalpis to Ascertain with what Species 

 of Trypanosomes, if any, they are Infected. 



Four hundred and ninety-six wild flies were examined ; 44 of these were 

 positive and 452 negative. Table I gives the result of the dissection of 

 the positive flies. 



Among the 44 flies which contained flagellates, it was possible to make a 

 more or less correct guess at the species in 19. These are T. brucei vel 

 rhodesiense, 1 ; T. pccorum, 9; T. simiee, 1 ; and T. grayi, 8. In 10 flies the 

 flagellates were considered to belong to a pathogenic type, species unknown. 

 No opinion could be expressed about the remaining 15. 



It is curious that G. brevipalpis should contain flagellates resembling 

 T. grayi, which is so often found in G. palpalis. Now one thing common to 

 G. brevipalpis and G. 'palpalis is that they both live alongside water. This 

 would point to the vertebrate host of T. grayi, if there is one, being some 

 water animal, such as the crocodile or iguana, or some water bird. 



Conclusion. 



Wild G. brevipalpis are naturally infected with T. brucei vel rhodesiense, 

 T. pccorum and T. simian. 



