^^III] TRYPANOSOMA SIMIM 353 



tube was filled \\dth small trypanosomes of the congolense type 

 without any free flagellum, whilst the parasites that swarmed 

 m the labrum were of the Leptomonas type. 



REFERENCES. 



Broden, A. (1904). Bull. Soc. d'Etndes Coloniales, Brnxelles, February 



1904. 

 Eaveran and Mesnil (1912). Trypanosomes et Trypanosomiases. 

 Montgomery and Kinghorn (1909). Ann. Trop. Med. and Parasii. 



vol. III. p. 349. 

 Rodhain, van den Brandon, Pons and Bequaert (191 2). Bull. Soc. 



Path. Exot. vol. V. p. 281. 

 Roubaud (1909). These de doct. es set. nat. Parish pp. 153 and 161. 



Trypanosoma simiae Bruce, Harvey, Hamerton, Davey and 

 Lady Bruce, 1912. 



Synonym. T. ignotum Kinghorn and Yorke, 1912. 



General account. This species of trypanosome has been 

 recorded from Nyasaland, Central Angoniland, and North- 

 Eastern Rhodesia, where a large percentage of Glossina mor- 

 sita)is are naturally infected with the parasite. Its pathogenic 

 properties are very remarkable, since it only affects such widely 

 different animals as monkeys and goats. Oxen, baboons, dogs, 

 guinea-pigs, and white rats, seem to be immune. 



In goats T. simia; sets up a chronic disease, but in monkeys 

 the infection is rapidly fatal, for in a series of 19 the average 

 duration of life after the trypanosomes were first seen in the 

 blood was only 2-9 days. 



Morphology. When living the parasite shews active pro- 

 gressive movements, some individuals passing completely 

 across the field of the microscope. The dimensions of the 

 trypanosomes as found in the monkey and the goat, are 

 found to vary from 14 to 24 microns in length, by i to 275 

 microns in breadth, the mean being 18 microns in length by 

 175 in breadth. The parasites are monomorphic and, as a 

 rule, fairly uniform in shape. The authors give the following 

 summary of its characters : 



" Elongated, narrow, undulating body ; posterior extremity 

 bluntly pointed or rounded ; anterior extremity pointed ; 



H. B. F. 23 



