208 PRECIS OF REPORTS CONCERNING TSETSE-FLY ANP 



hills and north from Domira Bay, so that at the present time the whole o£ 

 the country below the 2500 £t. level to the Lake shore (with the exceplion 

 of a few miles of plain and timberless country here and there) may be said 

 to be infested. South of the Lintipe, the spread of tsetse has not been so 

 noticeable, as the orioinal belts were not so clearly defined, the country being 

 very broken and not extensively visited by Europeans. The tendency at 

 present is for the tsetse to spread closer to the Lake, whereas a few years ago 

 they were seldom met with within a distance of five miles or so back from 

 the Lake." 



The alleged ^' spread ''^ of the fly is possibly explained by the fact that new 

 fly- areas have now been found, hitherto not discovered. The rest of the 

 district other than that mentioned can be described as free from fly. 



10. Marimba. 



Kota-Kota division. — From the Dwangwa Eiver Boundar}' to the Chirua 

 River Boundary, extending inland to the Hills, tsetse is prevalent. The 

 tendency of the fly is to spread from the Lake level up along the river 

 banks : it has advanced along the River Bua to the foot of the Mdonda Pass ; 

 also along the Kaombe River to the villages of Ngoma and Mbobo, approaching 

 the Ngara boundary, k similar tendency has been observed along the 

 Dwano-wa, Chirua and other rivers. 



Ngara division. — With the exception of the Upper Lingadzi and Mpongala 

 Rivers near the eastern boundary, w^here fly were discovered in 1907, no 

 tsetse exist in this division. It is suspected that the fly is spreading east 

 from the Rukuzizi [? Lukuzi] River in North Eastern Rhodesia. 



11. "West Nyasa. 



The only known flj^-area is a strip along the Lake shore from the Dwangwa 

 River north to Kuwirwe Mountain. This extends from a short distance back 

 from the shore to well on to the foot-hills. Seven years ago a European 

 drove a large herd of cattle up through this area to Kuwdrwe without seeing 

 a fly or losing one head. This may point to the possibility or not of the 

 fly-area being of recent date. On the other hand, fly was found 20 years 

 ago in the Limpasa Valley, and none have been observed recently. The 

 population is small and owns practically no cattle, so the absence or otherwise 

 of fly throughout this district cannot yet be proved. 



12. ]y[oiiil)era. 



No tsetse-fly have yet been found in this district. 



13. North Nyasa. 



G. morsitans is found around the Vwaza Marsh in the south-west corner 

 of the district and along the Hewi River a short way ; and G. fusca at 

 Kaporo, in a belt of forest along the Lake shore and for a short distance 



