ENTOMOLOGY 277 



bush clearing would probably be sufficient to eradicate fly. This 

 was demonstrated also by Nash in Tanganyika, by exposing pupae 

 in the bush at different depths in the soil. 



The Nigerian forestry department has also for some years been 

 studying the relation of forest protection to tsetse control and has 

 urged that scattered villages in tsetse fly areas should be concen- 

 trated and the remaining forest land proclaimed Forest (Tsetse) 

 Reserves, in which experiments in protection by densification of 

 vegetation and grass-burning should be undertaken. 



The fact that tsetse flies have received more attention in Tan- 

 ganyika, Southern Rhodesia, and Nigeria gives the impression 

 that the actual problem is more important in these territories than 

 elsewhere. This is probably not the case, however, though govern- 

 ments in other territories have not yet come to regard the problem 

 as one for immediate attack, for various reasons. Thus in Northern 

 Rhodesia, Captain Pitman (1934) concluded from his faunal survey 

 that the tsetse problem looms just as large as in the neighbouring 

 territory of Tanganyika. It seems that no intensive survey of the 

 position in Northern Rhodesia has been carried out, but it is 

 generally assumed that fly has made encroachments in two areas 

 with heavy loss of cattle. 



Work in East Africa is referred to and summarized in the pro- 

 ceedings of the conference on the co-ordination of tsetse and try- 

 panosomiasis research, published by the Conference of East African 

 Governors (1936). In Nyasaland the medical entomologist, Mr. 

 W. A. Lamborn, centred at Fort Johnson, works on fly and sleeping 

 sickness from many points of view. Among other studies he has 

 proved, in collaboration with Professor J. G. Thomson of the 

 London School of Hygiene and Tropical Medicine, that trypano- 

 somes can be transferred accidentally by flies which do not suck 

 blood (1934). In Kenya several experiments on measures of 

 control are in progress, involving co-operation between the 

 division of animal industry, the medical department and the 

 tsetse fly department of Tanganyika, and the medical entomo- 

 logist, Mr. C. B. Symes (1935), has summarized the work on G. 

 palpalis in Kenya. An experiment on the use of traps against 

 G. palpalis is taking place on an island in Lake Victoria near 

 Kisumu. The area of the Lamb we River in North Kavirondo, 



