144 



to the gauze ; this composition must not give off any odour repellent 

 to Tsetse-flies, but the smell of resin does not appear to be of this 

 character. Unfortunately the experiments that have been made with 

 this trap have not hitherto proved satisfactory, since the Tsetse-flies 

 that happened to be in the immediate vicinity of the man were the 

 only ones that were caught. 



We quote below Dr. W. A. Lamborn's account (82) of experiments 

 in trapping Glossina morsitans, carried out by him in Nyasaland, in 

 December 1914. 



" In accordance with Sir Patrick Hanson's suggestion," writes Dr. 

 Lamborn, " a cage of wire mosquito-proof netting was constructed in a 

 part of the Lingadzi district where tsetses are especially numerous, 

 and in this a goat was incarcerated, the outer side of the cage and the 

 under sides of branches of trees near by being smeared with bird-lime 

 in the hope of catching the flies attracted by the animal. The results 

 were by no means satisfactory, for no more than eight flies were taken, 

 though the goat remained there for seven days, a failure possibly to be 

 explained by its not being called upon to move about with any degree 

 of activity, and by the inability of the fly to see such movements as 

 occurred, my experience in this connexion confirming that of other 

 observers, namely, that the flies are attracted especially by moving 

 objects. 



" Why, however, the odour of the goat, which was especially strong, 

 the animal being a male, should have failed to attract them it is 

 difficult to understand, seeing that, like some TABANIDAE, G. morsitans 

 will after a little time discover a freshly killed animal and settle to feed, 

 in which case the fly can only have been drawn to the scene by the 

 sense of smell. When this particular goat was removed and paraded 

 up and down in the vicinity it was much assailed by the flies. 



" A series of experiments was made in the use of English bird-lime 

 spread on various materials carried on the backs of natives, in the 

 hopes of catching morsitans in the same way as palpalis is caught in the 

 Island of Principe. The results are tabulated below : 



" As morsitans is so frequently observed to settle on the under side 

 of loads carried on the heads of natives, experiments were also made 



