REVIEW. 



223 



these young hop-lice, and, on being furnished with a supply in hopcoues, 

 on the 26th August, I found that the frontal tubercles and amount of 

 gibbous form of the root-joint of the horns was more developed ; in fact, 

 now (that is, in the summer form) they precisely resembled the typical 

 figure of the head of the hamuli larva given by Mr. Buclcton (B^ig. III., 1), 

 which I copy for comparison with my own drawing (Fig. III., 2, from a 

 summer specimen)." 



^"^^^g^^-f^^ 



3 4 



Fig. I. — Larv^. Winged Females. 



1, 2, Hop Aphis; 3, i, Damson Hop Aphis. 



3 4 



Fig. II.— Advanced Stage (? PuPffi). Wingless Females. 

 1, 2, Hop Aphis; 3, 4, Damson Hop Aphis. 



1 2. 



Fig. III. — Larv^ of Hop Aphis. 



Evidence is then adduced from entomologists of repute in 

 favour of the theory of the hop aphis migrating from the sloe. 

 The opinion held by a large number of hop-growers that the fly 



