30 Sir D. Bruce and others. G. brevipalpis as a 



(c) Result of the Dissection of the Infected Flies. 



Table X. 



Expt. 



2190 

 2190 

 2190 

 2190 

 2190 

 2190 



Time, days. 



Proboscis. 



Labial cavity. 



23 

 23 

 36 

 36 

 36 

 36 



Hypopbarynx. 



+ + 



+ + 



+ + 



+ + 



Alimentary 

 tract. 



Salivary 

 glands. 



In Experiment 2190 six infected flies were found. In four of these the 

 hypopharynx was blocked with small " blood forms " of T. pecorum. Taking 

 into consideration the time which elapsed between the feeding on the 

 infected goat and the appearance of an infective fly in the cage — 23 days — 

 and, further, the number of flies found infected with T. pecorum — 4 in 33 — 

 it must be admitted that a development of T. pecorum has taken place in 

 G. brevipalpis. 



Conclusion. 



G. brevipalpis is capable of acting as a carrier of T. pecorum. 



4. The Development of T. caprae in G. brevipalpis. 



(a) Feeding wild G. brevipalpis, first on Animals infected with T. caprae, and 

 then on Healthy Animals, to ascertain if this Species of Trypanosomc parses 

 through a Cycle of Development in this Species of Tsetse Fly. 



Three experiments were carried out with wild flies. One was negative and 

 two positive. On examining the positive experiments, they were found to 

 be T. pecorum infections, and not T. caprw. The animals were probably 

 infected by naturally-infected G. brevipalpis. No infection by T. caprce took 

 place, but one of the flies, on dissection, was shown to have an undoubted 

 development of T. caprce in the labial cavity and hypopharynx. 



Table XL 



Date. 



Expt. 



No. of 

 flies 

 used. 



Expt. positive 

 or negative. 



No. of flies 

 dissected. 



No. of 

 infected flies 

 found. 



No. of days 

 before flies became 

 infective. 







1912. 

 April 11 ... 

 May 30 ... 

 July 17 ... 



2071 

 2199 

 2277 



11 



60 

 50 



+ 

 + 



3 

 25 

 



1 

 1 







20 

 24 



