Hop. — HOP APHIS. 



119 



HOP. 



Hop Aphis. Aphis (Fhorodon) hiimuU, Sclirank. 



Apliis Innnuli : winged and wingless viviparous females, magnitied. * 



The Hop-i^Iant Las many insect-foes. Chief amongst these 

 is the Green Fly, or Aphis, which in some seasons causes the 

 almost total destruction of the crop of Hops. 



Hop Aphis: base of antenna3 and frontal tubercle of — 1, young form; 2, 

 wingless female, magnitied. 



The general appearance of these pale green Aphides is too 

 well known to require description, but it may be observed that 

 the genus Phorodon, to which they belong, is distinguishable 

 from others of the Aphidime by the horns being hardly longer 

 than the body, together with the lowest joint being toothed or 

 gibbous, and the tubercles on the forehead each having a 

 strong tooth. The legs are short, and the honey-tubes long. 



The larva (or louse as it is commonly called in its earliest 

 stage) is very pale ; later on, in the pupa state, the head and 

 fore part of the body are broad and squarish and the colour 

 green. 



The wingless viviparous female is pale green, with from one 

 to three green stripes down the back (see figure for general 



* The above figures are acknowledged, with thanks, as reduced copies of figs. 

 1 and 4, Plate xxx., vol. 1 of ' Mon. of British Aphides,' by G. B. Buckton, F.E.S. 



