F. W. Dry 



107 



F/L.EY JflV 



Chart 4. Showing for each district the relative density of Brood II of the Swede Midge in 1914. 



Roman numeral = number of district. 

 Arabic numeral = index (Brood II). 

 A rectangle of unbroken lines round the index figure indicates that the Brood II index exceeds the 

 Brood I index. 



A rectangle of dotted lines round the index figure indicates that the Brood II index does not exceed the 

 Brood I index. 



