172 APHIDES, SCALE INSECTS, PLANT-BUGS, ETC. 



sel-shell on the bark, to the Cuckoo Froghopper, 

 springing in its headlong leaps, with its long legs 

 trailing far behind it; and an idea of their appearance 

 will be given much more clearly by figures than de- 

 scriptions. Some, also, are so much alike in their first 

 stages, that it is of use to observe that, as in the order 

 •■of Beetles, the chief sections are classed by the number 

 of joints of the feet. 



The Froghoppers or Cuckoo Flies, some of which 

 ■are very hurtful to Hops, are amongst the first section, 

 with three-jointed feet. Trimera. 



The Aphides or Plant-lice; the Psijllidce, sometimes 

 known as Jumping Plant-lice ; and the small Snowy 

 Flies (Aleyrodes), which do a good deal of harm to 

 Cabbage ; — belong to the second section, with two- 

 jointed feet. Dimera. 



The Scale Insects {Coccidce) are the third section ; 

 these have feet with only one joint. Monomera. 



In the first section (the Trimera) the insects which 

 concern us the most are the Froghoppers. These live 

 in all their stages, as far as their history is known, by 

 driving their beak into the attacked plant, and sucking 

 -out the juices. One well-known kind is the Cuckoo- 

 spit, as it is called, which is to be found, in its two 

 first stages, on many plants, in a mass of froth which 

 it has caused. It is said sometimes to do a great deal 

 of harm ; but I have found that merely giving the 

 attacked plant a hard watering, from overhead, easily 

 cleared off both the froth and insect ; and if this attack 

 should occur, the mere application of a good quantity 

 of water by means of large garden-engines, such as are 

 used in Hop grounds, would probably get rid of it at 

 once. 



Another kind of Froghopper, known as Jumper or 

 Cuckoo Fly, does a great deal of harm in some years 

 to Hops. This is of a yellow colour, beautifully 

 marked with brown ; but to get a hold on it we need 

 to know where the eggs are laid from which it hatches. 

 A nearly-allied kind is stated to lay its eggs in autumn, 



