Strain of T. brucei from Zululand. 529 

 Kesult of the Dissection of the Infected Flies. 



Table V. — Laboratory-bred Flies. Positive Experiments. 





Time, 

 days. 



irrou 



JuabiaL 

 cavity. 



oscis. 



Hypo- 

 pharynx. 



Proventri- 

 culus. 



Crop. 



Fore- 

 gut. 



Mid- 

 gut. 



Hind- 

 gut. 



Salivary 

 glands. 



1909 



33 











+ 









1909 



34 







+ 





+ + 



+ + 



+ + 





1909 



35 



— 





- 





+ + 



+ + 



+ + 



+ + 



1909 



36 



— 





+ + 





+ + 



+ + 



+ + 



+ + 



1909 



37 











+ 



+ 



+ 





1909 



43 



— 









+ + 



+ + 







1909 



47 



— 





+ 







+ 







1909 



50 



— 











+ 







1909 



51 



— 



— 







+ + 



+ + 





+ + 



1909 



57 







— 







+ 







1988 



22 



— 



— 





+ + 



+ + 



+ + 



+ + 





1988 



23 



— 



— 



— 



— 



— 



+ 



+ 



— 



1988 



30 



— 



— 



+ 





+ 



+ 







1988 



30 





— 



— 







+ 





— 



1988 



31 



— 



— 









+ 





— 



1988 



31 





+ 



+ 



+ 



+ 



+ 



+ 



+ + 



1988 



31 



• 



— 



+ 





+ 



+ 





— 



1988 



33 



— 



— 









+ 





— 



1988 



34 



— 



— 









+ 





— 



1988 



34 







+ 





+ 



+ 



+ 



+ 



1988 



34 



— 



— 









+ 





— 



1988 



34 



— 



— 









+ 





— 



1988 



34 



— 



— 









+ 





— . 



1988 



34 



— 



- — 









+ 





— 



1988 



34 













+ 







1988 



34 



- 



- 



+ 







+ 





- 



1988 



35 













+ 







1988 



36 







+ 





+ 



+ 



+ 





1988 



37 











+ 



+ 



+ 





1988 



37 







+ 





+ 



+ 



+ 





2188a 



24 













+ 







2188a 



24 













+ 







2188a 



29 













+ 







2188a 



32 













+ 







2183a 



32 













+ 







2188a 



32 













+ 







2188a 



32 











+ 



+ 



+ 



+ + 



2188a 



32 













+ 







In Experiment 1909, 10 infected flies were found. Three of these had the 

 salivary glands swarming with trypanosomes ; in none was the labial cavity 

 or hypopharynx found to contain flagellates. 



In Experiment 1988, 20 infected flies were found. Two had an invasion 

 of the salivary glands. In one it is noted that a few active trypanosomes 

 were seen in the labial cavity, and in one that a few " blood forms " were 

 seen in the hypopharynx. 



In Experiment 2188a, eight infected flies were found, one of which had 



