Diseases of Domestic Animals in Nyasaland. 35 



Table III. 



Expt. 



Day of 

 expt. 



Procedure. 



Remarks. 



1732 



1-2 

 3 



4-39 



60 flies fed on T. pecorum- 



infected dog. 

 Starved. 



Fed on clean Dog- 1736. 

 (Experiment stopped.) 



Dog 1736 never showed trypanosomes. 

 25 flies remained alive ; used for another 

 experiment. Only 12 flies dissected; all 

 negative. 



2115 



1-4 



5-6 

 7-8 



40 flies fed on T. peeorum- 



infected rat. 

 Starved. 



Fed on clean Monkey 2066. 

 (Experiment stopped.) 



Monkey 2066 never showed trypanosomes. 

 All flies dissected ; 4 found infected. 

 Experiment stopped on account of death 

 of most of the flies. 



Eesult of the Dissection of the Infected Flies. 



The following Table gives the result of the dissection of the infected Hies 

 found in the positive experiments. The second column gives the number of 

 days between the first infected feed of the fly and its death and dissection : — 



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



Expt. 



Time, 

 days. 



Proboscis. 



Proventri- 

 culus. 



Crop. 



Fore- 

 gut. 



Mid- 

 gut. 



Hind- 

 gut. 



Salivary 

 glands. 



546 



30 









• 



+ 



+ 



+ 



_ 



546 



64 











+ + 



+ + 



+ + 





546 



84 











+ + 



+ + 



+ + 





546 



84 



+ 



+ 



+ + 



+ + 



+ + 



+ + 



+ + 





524 



27 













+ + 



+ + 





524 



55 



+ 



+ 





+ + 



+ + 



+ + 









Labial 



Hypo- 



















cavity. 



pharynx. 















1737 



27 



+ + 



+ + 



+ + 



+ + 



+ + 



+ + 



+ + 





1737 



28 



+ 





+ 





+ + 



+ + 



+ 





1737 



30 



+ + 



+ + 



+ + 





+ + 



+ + 



+ + 





1853 



17 



+ + 



+ + 







+ + 



+ + 



+ + 





1853 



22 











+ 



+ + 



+ 





1853 



23 



+ 





+ 





+ + 



+ + 



+ + 





1853 



25 



+ + 



+ + 



+ 





+ + 



+ + 



+ + 





1853 



26 



+ + 



+ + 



+ 





+ + 



+ + 



+ + 





1950 



17 







+ 





+ '+ 



+ + 



+ + 





1950 



19 



+ + 



+~+ 







+ + ' 



+ + 







1950 



24 













+ 



+_+ 





1950 



26 



+ + 



+ + 



+ 







+ + 



+ + 





1950 



31 



+ + 



+ + 



+ 





+ + 



+ + 



+ + 





1950 



31 



+ + 



+ + 



+ + 





+ + 



+ + 



+ + 





In Experiments 546 and 524 there was no special examination of the 

 hypopharynx ; it is included in the general term " Proboscis." It was only 



D 2 



