Carrier of Tnjpanosome Disease in Nyasaland. 23 



Table I. 



Date. 



No. 

 of fly. 



Pro 



Labial 

 cavity. 



boscis. 



Hypo- 

 pharynx. 



Proventri- 

 culus. 



Crop. 



Fore- 

 gut. 



Mid- 

 gut. 



Hind- 

 gut. 



Salivary 

 glands. 



191.2. 







j 













June 14 ... 



1 











+ 





_ 



„ 14 ... 



2 



— 



— 



- 



— 



— 



+ + 



+ + 





1 A 



Q 

 O 



4- 









+ 



' + 







1 A 



„ 14 . , . 



A 



4f 





— 





+ + 



+ + 



+ + 







913 









— 









+ 







9fl 



, 7 ... 



o 













-r 



+ 







,5 <£o ... 



7 



+ 









+ + 



+ + 







40 . . . 



o 

 





— 









+ + 







no 



60 ... 



9 





— 







+ + 



+ + 







' i * * * 



10 





— 



+ + 







+ + 







iy to. 





















IVlar. 5 



1 1 



+ 



+ + 







+ + 



+ + 



+ + 





l « 



1 9 





— 









+ + 







1 ft 



JUi 





— 







+ + 



+ + 



+ + 





jj "J- • • ■ 



1 A, 





+ 



— 







T 







April 4j ... 



10 





— 



— 





+ 



+ 



+ 





... 



1 ft 

 ID 





— 









+ 







iviay . . . 



17 

 1/ 



















„ rfl ... 



1ft 



+ 









+ + 



+ + 







Of 



„ Ol ... 



19 





— 















June 6 ... 



9n 





— 









+ 







o 



jj " * * * 



9 1 











+ 









» 5 ... 



99 



+ + 



+ + 







+ + 



+ + 



+ + 





Q 



9Q 





— 









+ 







1 9 



n ±* ■•• 





+ X 



+ + 



+ + 





+ + 



+ + 



+ + 





93 













4- 4- 

 T i 



+ + 



+ + 



+ + 



9 1 



Oft 

 £V 



+ + 



+ + 







+ + 



+ + 



+ + 





j, -O . . . 



97 

 Z/ 













+ 







9ft 



9Q 













+ 







9ft 



90 



+ 









+ 



+ 







July l ... 



oU 



+ + 



+ + 







+ -i- 



+ + 



+ + 





jj & ■• 



O 1 













+ 







11 . . . 















+ 







)t 14) . . . 



QQ 



+ + 









+ + 



+ + 







1 A 



„ 14 ... 



O/l 



o4 













+ 







„ 14 ... 



35 



+ + 









+ + 



+ + 







„ 16 ... 



36 













+ 







„ 16 ... 



37 



+ 









+ + 



+ + 







„ 16 ... 



38 



+ + 



+ 







+ + 



+ + 







„ 24 ... 



39 













+ 







„ 24 ... 



40 



+ 











+ 







„ 24 ... 



41 













+ 







„ 24 ... 



42 





_ 









+ 







„ 30 ... 



43 



+ 











+ 







„ 30 ... 



44 













+ 







III. The Infectivity of the Wild G-. brevipalpis. 



A few experiments were made to test the natural infectivity of G. brevipalpis 

 by feeding them on healthy animals. 



When the flies were brought up from the Lake-shore they were fed on a 



