1910.] The Natural Food of Glossina j^oblpcdis. 



497 



this way compared with the standard measurements. No allowance could be 

 made for alterations due to digestive changes : these were presumed to be 

 similar in all cases. 



Table V. — Showing the Result of the Examination of Glossina pal2Mlis 

 from " Crocodile Point." 













tio 







Non 















> 





g 







mammalian 















i> 



"S 

 '3 



o 

 o 





blood. 







0. of flies. 







lining 



e emp 



S 



^ . 



lian b 



S 



S . 







c 



(n 

 (B 









contn 



itestin 



C 



§ 



mntu'B 



oii-nia 

 blood, 



d 

 .2 







lagella 



'S 







CH- 



o 



hi 



c 



M 



S 





<1 







PR 



w 



183 



104 



79 



32 



75 



108 



7 



35 



7 



13 



14 



5 



Percentages... 



57 



43 



17 -4 



41 



59 



3-8 



19 -1 



3-8 





7 



7-6 



2-7 



Conclusions. 



Two hundred and twenty Glossince lyalpolis were caught on various parts 

 of the Lake-shore, and at intervals extending over several months ; they were 

 examined about 24 hours after capture. The examination of their intestinal 

 contents revealed the fact that about 27 per cent, contained the remains of 

 blood, the majority of which was of mammalian origin. 



In the second experiment, 183 Glossince 2>nlpalis were caught at one spot 

 where the food supply was abundant — birds and crocodiles — and the flies 

 were examined at once. A much higher percentage (nearly 60 per cent.) 

 contained the remains of a blood meal. The blood in the majority of the 

 flies had been obtained from birds or reptiles, and of these the reptilian blood 

 was twice as frequent as the blood of birds. 



