^"^IIl] REFERENCES 321 



of food the native rushes forward and claps his hand over the 

 aperture. He then closes the hole in some more permanent 

 fashion, and carries off the flies in triumph for the future 

 discomfiture of those with whom he has a feud. This native 

 custom would certainly seem to indicate that a blood trap is a 

 feasible method of deahng with one of the greatest pests from 

 which Africa, the land of pests, has ever had to suffer." 



Mr Maldonado, manager of one of the estates in the Isle of 

 Principe, caught large numbers of G. palpalis, by making his 

 labourers wear a black cloth, coated with bird-hme, on their 

 backs. This method of trapping tsetse-flies, however, has not 

 given good results in other locahties, for it has been shewn that 

 a single fiy-catcher can capture far more flies in a single day 

 than twenty or thirty fly-papers. 



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