298 ENTOMOLOGICAL NEWS. [Oct., 'o6 



of the abdomen of a female. It was, I judge, rather more than 

 2.0 mm. long and of a light dirty yellow color. I have sent 

 to Esupua to procure if possible some living flies and also some 

 in alcohol so as to be able to send Mr. Austen a series of larvae. 

 The pupa I have not seen." 



THE NEW FLY AND TRYPANOSOMIASIS. 



I have lately seen three cases of human trypanosomiasis, all 

 of whom had been frequently in the "fly belt" at Esupua. 

 About 500 blood examinations were made, so that about three 



V 



C 



Fig. i.— Tr. f gambiense Dutton. 



out of every 500 natives living in the districts adjacent to the 

 Esupua "fly belt" harbor trypanosomes in their blood. The try- 

 panosome found seems to be morphologically identical with Tr. 

 gambiense Dutton. The shape of the posterior end, the ar- 

 rangement of the controsome, nucleus and flagellum, as well 

 as the "set" of the organism on the slide, correspond with the 

 same points in Tr. gambiense. The protoplasm stains some- 

 what irregularly with Romanowsky, taking on a basophilic 

 reaction. The centrosome stains a dark purple, and the flagel- 

 lum, which stains pink, seems to rise from or near it. The 

 nucleus lies near the middle of the body and often occupies more 

 than two-thirds the width of the parasite. It is oval in shape 

 and stains red like other chromatin material. Following are 

 measurements of a stained specimen of the parasite : 



Length (about) 24 



Greatest width 3.5 



Distance of centrosome from posterior end 3 



Length of free flagellum. (about) 9 



Largest diameter of nucleus 4 



