19 10. J The Natural Food of Glossina imliialis. 



495 



In the present experiment, the observer landed by canoe and made the 

 paddlers sit round him ; the fly-boys moved about amongst them and 

 caught the flies as they came to feed. They were handed at once to 

 the observer, who snipped off their heads, noted their sex, and roughly 

 dissected out the alimentary canal, and, when it contained food-stuff, 

 smeared it at full length on a slide. Notes were made as to the naked- 

 eye contents of the canal and the question of pregnancy. The smears were 

 fixed in the usual way and brought to the laboratory, where they were stained 

 and examined minutely. 



The total number of flies examined was 183, of which 104 (57 per cent.) 

 were males and 79 (43 per cent.) were females ; of the total number, 108 

 (59 per cent.) contained blood in a more or less digested state, and 75 (41 per 

 cent.) contained no food-stuff. Out of the 79 females, 32 (40 per cent.) 

 contained nearly fully-developed larv*. 



Table III. — Shows the Nature of the Blood in the Interior of the Flies, 

 and also the Number of Flies which contained Parasites. 





.i - 



alian 



lomes. 







a- 



alian 



omes. 







li 



B o 



o 



i 



alteridi 







S o 



O 



c 









. 03 O 



g as 





d 



is 



• :S O 



§ as 



ci 



o 







1 



H 



W 











w 



\ 





+ 







27 





+ 











+ 







28 





+ 







3 





+ 



+ 





29 





+ 







4 





+ 







30 





+ 



+ 





5 





+ 







31 





+ 







6 





+ 







32 



+ 









7 





+ 







33 





+ 



+ 





8 





+ 







34 





+ 







9 





+ 







35 





+ 







10 







+ 





36 







+ 





11 



+ 









37 





+ 







12 





+ 







38 







+ 





13 







+ 





39 





+ 







14 





+ 





+ 



40 



+ 









15 







+ 





41 







+ 





16 





+ 







42 





+ 







17 





+ 







43 





+ 





+ 



18 







+ 





44 





+ 







19 





+ 







45 





+ 







20 







+ 





46 



+ 









21 



+ 



+ 







47 





7 







22 





+ 







48 







+ 





23 





+ 







49 







+ 





24 





+ 



Trjpano- 





50 





+ 













plasma 





; 51 



+ 









25 





+ 





+ 



1 52 



+ 









26 







+ 















