SIGNIFICANCE OF STEGOMYIA FASCIATA IN WEST AFRICA. 251 



Kroobay, Freetown, in canoe, 31.viii.l0 : — 



1 Cide.c sp. ?, badly damaged. 

 Deborah Street, Freetown, in cask, G.ix.lO : — 



1 Stegomyia fasciata^ Fab. 

 Soldier Street, Freetown, in old pot, 15.ix.lO :— 



1 Stegomyia fasciata. 

 Adelaide Street, Freetown, in lily pot, o.ix.lO : — 



1 ^ Stegomyia sugens, 1 badly damaged Culeoc- sp. ? 



Vals Showrooms, Water Street, Freetown, in old tank, 29.viii.10 : — 



2 Stegomyia fasciata, 2 Stegomyia sugens. 

 Benjamin Lane, Freetown, in cask, 9.ix.lO : — 



6 Stegomyia fasciata. 



The above data sufficiently indicate that Stegomyia fasciata is by far the 

 most prevalent mosquito found in artificial collections o£ stagnant water. 

 The reports show that in the course of a few weeks the percentage of houses 

 infested has been reduced from 44 per cent, to 7 per cent., and that it is 

 possible without any large expenditure of money to reduce it still further. 



Sierra Leone Protectorate. 



I was enabled to examine both Bo and Kenema, which are towns in the 

 interior on the railroad. At Bo, in the native town, I found the common 

 mosquito to be Stegomyia fasciata ; it was breeding in barrels and in all 

 collections of stagnant water retained in cans, bottles, or odds and ends. 



In Kenema, which is a wonderfully clean native town, there is a pipe 

 supply of water, and there are few barrels or odds and ends. I found 

 Stegomyia however in a large rot-hole in a tree and in a barrel used by 

 builders. 



Bullom Country. 



After making a sanitary tour of inspection of this part of Sierra Leone in 

 February 1909, the Medical Officer in charge reported : — 



" Stegomyia fasciata swarms in the grass fields and is also common in the 

 coast towns ; this being so, if yellow fever once got a hold of the country, it 

 would spread rapidly right up to Port Lokko, if not further.^' 



There can be no doubt that the common mosquito breeding in artificial 

 water-containers in Freetown is Stegomyia fasciata. This finding is in 

 conformity with what we know of yellow fever in the Colony, and supports 

 the view that the disease is endemic. 



2. The Stegomyia in the Gold Coast Colony. 



On my arrival in June 1910 in the Gold Coast Colony, I immediately set to 

 work to obtain an estimate of the prevalence and numbers of Stegomyia in 



X 2 



