48 Infectivity of G. morsitans in Nyasaland during 1912-13. 



Table II. — 1913 — continued. 



No. of fly. 



Proboscis. 



Labial cavity. Hypopharynx. 



Intestine. 



Salivary 

 glands. 



Species of 

 trypanosome. 



82 

 83 

 84 

 85 

 86 

 87 

 88 

 89 

 90 

 91 



T. pecorum. 

 T. simice. 



In 1913 no injections of the contents of organs were made into healthy 

 animals. The direct diagnosis of the species of trypanosomes by examination 

 •of the fly took the place of inoculation. 



From the above table it will be seen that in 1060 flies T. brucei vel 

 rhodesiense was found once, T. pecorum six times, T. simice 12 times, and 

 T. caprce 14 times. It must, however, be confessed that the margin of error 

 in this calculation may be large. 



Conclusion. 



In 1912, 6"53 per cent, of the 67. morsitans found in the " Proclaimed " 

 or Sleeping-Sickness Area, Nyasaland, were infected with pathogenic 

 trypanosomes ; in 1913, 8'58 per cent. 



