168 



J, W. SCOTT MACFIE AND A. INGRAM. 



Chart I. 



The rainfall and mean temperatures and humidity at Accra from December 1914 to 



December 1915 ; Ma., maximum shade temperature ; Mi., minimum 



shade temperature ; H., relative humidity ; R., rainfall. 



The Distribution of the Larvae in the various Divisions of Accra and Christiansborg. 



Accra is divided into seventeen blocks, and Christiansborg into seven. These areas 

 are of different sizes and very diiTerent characters, some being crowded with small 

 native compounds, others being almost rural. It seemed important therefore to 

 determine whether there were any numerical or specific differences in the distribution 

 of mosquitos in them. It would have been more instructive if the distribution could 

 have been follovved house by house, but this was found to be impracticable, owing to 

 the alterations constantly taking place in the town. 



The majority of samples containing larvae that were examined were labelled with 

 the number of the block of the town in which they had been found. In the year 1915 

 it was possible to ascertain the exact block in which four out of the five samples 

 containing Anopheline larvae were found, 328 out of the 339 in which Stegomyia 

 larvae were found, and 65 out of the 76 in which other Culicine larvae were found. 



