108 



Swede Midge in parts of Yorkshire 



l8j v f/tEY 



Chart 5. Showing for each district the relative density of Brood III of the Swede Midge in 1914. 



Roman numeral = number of district. 

 Arabic numeral = index (Brood III). 

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

 Brood II index. 



A rectangle of dotted lines round the index figure indicates that the Brood 111 index does not exceed the 

 Brood II index. 



