4 J. W. SCOTT MACFIE — THE DISTRIBUTION OF GLOSSINA 



was 75, and the rainfall, 65.18 inches, was one of the highest recorded in Northern 

 Nigeria. The province of Ilorin, as might be expected from its geographical 

 position, differs in climate to a marked extent from the more northerly regions. 

 For example, in the greater part of Northern Nigeria the rainfall and temperature 

 curves show only one annual maximum and minimum. In Ilorin, however, the 

 temperature curve tends to show a double crest, and the rainfall, which is 

 conspicuously heavy, rises gradually to a maximum in June, then falls off, only 



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Fig. 1. — Curves showing the rainfall in Ilorin Province ; the black line represents the 

 average rainfall for the seven years, 1905 to 1911 ; the dotted line shows the 

 rainfall for 1912. 



to bound up again to its highest point in September. The rainfall is peculiar 

 also inasmuch as normally no month is absolutely rainless, although but little is 

 recorded during December, January and February. The curve reproduced 

 above shows in a graphic manner the average rainfall for the last seven years 

 (1905-1911). The rainfall for the present year (1912) is also shown, as it 

 has been exceptional, a drought occurring from May to August, and it may 

 therefore have had a bearing on the distribution of the tsetse-flies. 



