254 SIK RUBERT BOYCE — THE PREVALENCE, DISTRIBUTION AND 



Obuassi. 

 I inspected 100 houses in this district and found 191 receptacles. Larvse 

 of the Stegomyia were found in 55 of the houses ; index 55 per cent. 



Kiimasi. 

 The Medical Officer reported that in an examination of 520 houses larvae 

 were found in 48 ; index 9 per cent. On the 2nd July I myself made an 

 examination of the 48 houses and found the larvae of the Stegomyia breeding 

 in 8. 



3. The Stegomyia in Senegal, Ivory Coast and Dahomey. 



Bouffard pointed out the prevalence of the Stegomyia in the Upper Senegal, 

 and French Niger territory in 1906. Ribot and Le Moal also drew 

 attention to the widespread distribution of this species in Senegal, and 

 describe the various anti-Stegomyia measures. From the history of yellow 

 fever in that country, it is evident that this must be the prevailing mosquito 

 of the towns, and that it is widely distributed, reaching as far as Dioubeba 

 in the Sudan. In a more recent paper Bouffard draws attention to the 

 essentially endemic character of yellow fever throughout Senegal. He has 

 investigated the trade routes, both by road, rail and water_, between Koulikaro 

 and Timbuktu, Bamako and Sikasso, Segu and San, and between Segu and 

 Kutiala, and finds the Stegomyia in all centres of population. This observer 

 insists on the essentially domestic character of the mosquito, and that it is 

 not as a rule found beyond a radius of 100 metres from the dwelling houses. 

 Le Moal gives the distance as 250 metres. He concludes that the mosquito 

 is abundantly distributed throughout all the towns and villages, and that it 

 breeds in the various receptacles which I have already described, and also in 

 all puddles near houses after rain. For the safety of the white man, he 

 insists upon segregation and anti-larval measures. Le Moal describes the 

 Stegomyia as abundant throughout Senegal, especially at St. Louis and 

 Goree Island, also in Konakry, and at Grand Bassam on the Ivory Coast. 



4. The Stegomyia in German African Colonies. 



According to Otto and Neumann, the mosquito is present in Togoland, 

 Cameroon s, and in German and British East Africa (OUwig). It is still 

 doubtful whether it is present in German South- West Africa. 



The German authorities are fully alive to its significance, and have 

 introduced strict anti-stagnant water ordinances for Togo, in 1910. Miich 

 more accurate information is still wanted as regards its distribution and 

 prevalence in the West and East African Colonies, and it is to be hoped 

 that definite information will soon be forthcoming. 



