Oct., 'o6] ENTOMOLOGICAL NEWS. 299 



I have described and figured this parasite in another com- 

 munication to which I refer the reader.* While sleeping sick- 

 ness does not seem to be endemic as yet in the districts adja- 

 cent to the Esupua "fly belt,"t yet it is endemic in many situa- 

 tions in Angola from the north bank of the Coanza River clear 

 to the Congo. As the country is being opened up it is inevi- 

 table that cases will from time to time be brought from the 

 northern sleeping sickness centers to districts in the south, 

 since many firms have trading posts and the Government has 

 forts in both districts between which native soldiers and 

 laborers are constantly being transferred. More forts are con- 

 stantly being planted and trading posts established. The 

 Umbundo-speaking Bantus, who number about 200,000, live to 

 the east of the belt infested by the fly, and most of the males of 

 these tribes are porters and rubber traders and constantly pass 

 through the Esupua "fly belt," through which such occasional 

 cases of trypanosomiasis J from Malange, Cazengo, Ambaca, 

 Dondo and other points in the sleeping sickness districts north 

 of the Coanza, to which I have above referred, are carried by 

 the activities just mentioned. Thus, the flies have and will 

 have more and more favorable opportunities to become infected 

 and to infect the Umbundos among whom I have recently 

 demonstrated the occasional presence of trypanosomiasis. I 

 believe for several reasons that this presence of trypanosomiasis 

 among the natives of south Angola is a recent development. 

 Some of these reasons are : 



(1) Two years ago I examined a series of nearly 400 of 

 these natives with a negative result. f 



(2) Recently about 500 examined by me revealed three 

 infected individuals in practically the same district. 



(3) No cases of sleeping sickness originating in the dis- 

 trict have yet been seen. 



♦Interim Report on Trypanosomiasis in Portuguese Southwest Africa. 



^Vide Wellman, Notes from Angola (Note X, Jour. Trop. Med., 

 November 15, 1905, p. 327.. 



$As sleeping sickness cases are occasionally transported, those in 

 the earlier stages of trypanosomiasis are undoubtedly also brought south. 



iVide Jour. Trop. Med., February 15, 1904, p. 53. 



