Insects, etc., Injurioiis to the Damson. 253 



Table Showing Life-History of Hop Aphis. 



A. DAMSON, Etc. 

 Winter. Ova 



B. HOPS. 



"Wingless Females (rare) Vivip. 



Spring. 1st Vivip. Wingless Females 



/ I \ 



3 generations of same 



May 



and 



June. 



Pupse 



Winged Vivip. Females 



Best of Summer.! None present 



Autumn. 



Winged A^ivip. Females 



Ovigerous Females 



and Winged Males 



Wingless Females Vivip. 



I I 



Wingless Females Vivip. 



Wingless Females Vivip. 



Wingless Females Vivip. 



Winged Vivip. and Wingless Vivip. Females 



Wingless Vivip. Females (lice). 



Wingless Vivip. Females 



Pup£e. 



Winged Vivip. Females 



INN Mill IN 



female migrants 



Winter. 



Ova. 



Few Wingless Females 



