FROGHOPPER. US 



either on the surface of the ground amongst Grass, or 

 amongst roots just below the surface. Another kind 

 is stated to lay its eggs, by means of its ovipositor, in 

 soft shoots. 



This is an example of how thoroughly we need to 

 know the whole history of an insect to be able to keep 

 it in check by reliable measures at a paying rate. 



Meanwhile, in this case much is done, when it 

 appears, by taking advantage of such of its habits as 



Fig. 133. — Hop Frog Fly and laiva ; magnified, with nat. size. 



are plainly to be seen. Trays about six feet long^ 

 made of iron, are provided, well smeared with tar, and 

 one placed on each side of the Hop hill. The bines 

 are shaken, and the Cuckoo Flies either fall or take 

 their leaps for safety, and light on the tar, which 

 promptly kills them. 



The green Frog Fly of the Potato is another ex- 

 ample of the same kind of insects, and I repeat the 

 figure to show the partly developed wings in the state 

 that answers to the pupa in this section of the 'Tri- 

 mera (see Fig. 134, on next page). 



The section of the Dimcra (those which have two- 

 jointed tarsi) comprises the PsyUiche, ApJtidce, and, 

 Aleyrodidce. 



