SIGNIFICANCE OF STEGOMYIA FASCIATA IN WEST AFRICA. 253 



tliroiigli the town, nevertheless T found a vast number o£ breeding places. 

 I examined 80 houses. In these I found 404 receptacles of all kinds con- 

 taining water ; earthenware pots were most abundant. Of the 80 houses, 

 ]arv?e were found in 61 ; the number of infested receptacles being 138. 

 I hatched out many of the larvse, and Dr. Graham confirmed my diagnosis 

 of Stegomyiii fasciata. In addition to finding very large quantities of empty 

 tin cans, it was noted that there was an excess of bush all over the town, 

 which might effectively conceal other such tins and prevent the water in 

 them from evaporating. 



Cape Coast Castle, July 1910. 



The report of the Medical Officer states that "out of 15 European 

 bungalows examined larvae were found in 13. . . . Larvae were found in all 

 native houses without exception." 



In a hurried examination which I made with the Medical Officer on the 

 6th July, I found a very bad state of affairs. In 30 houses, or their yards, 

 tliere were 32 earthen pots, 18 barrels and 3 wells, and larvae were found in 

 17 of the 30 houses (index 57 per cent.). The Stegomyia was the prevailing- 

 species. 



Axim. 

 The Medical Officer reported that he had personally inspected 63 houses 

 and found larv?e in 6, in every instance they were those of the Stegomyia ; 

 index 9 percent. Another report stated that 1,136 houses had been inspected 

 and in 50 larvse were found ; index 4 per cent. 



Elmina. 

 The report of the Medical Officer gave the Stegomyia index as 33 per cent. 



Saltpond. 

 The report of the Medical Officer stated that 275 houses had been examined 

 and larvae found in 78; index 2% per cent. 



Kitta. 

 The Medical Officer reported the Stegomyia present in all houses; index 

 100 per cent. 



Adaa. 

 The Medical Officer estimated the percentage of Stegomyia. as 6 per cent. 

 In an examination of houses which he made he was unable to detect the 

 Stegomyia amongst the larvae. 



• Tarhv^a. 



The Medical Officer re])orted the index as 10 per cent. He also stated 

 that of 136 rooms inspected, in 14 the larvae or the imagines of the Stegomyia 

 were found. On the 24th June I visited the town, and in an examination of 

 40 houses in the miners' village I found Stegomyia larvae in 23. In my 

 opinion the prevailing mosquito in Tarkwa is Stegomyia fasciata. 



