F. W. Dry 



105 



T/Lty J>Ai 



Chart 2. Showing for each district the relative density of Brood II of the Swede Midge in 1913. 



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. 



