60 Vict. 



Provincial Board of Horticulture. 



11 



Hop Aphis (Phorodon humuli). 



(Fig. a.) 



Winter egg of %iie hop.plant louse, and the shrivelled skin of 

 the sexual female which laid them. (Enlarged.) 



(Fig. B.) 



The hop plant louse, third generation on plum — the generation which flies 

 to the hop plant. Head below at right. (Both enlarged.) 



(Pig. C.) 



The hop plant louse, true sexual 

 female. (Enlarged.) 



