308 



GARDEN FOES. 



gradually widening at the tail. As soon as they are fully 

 fed they attach themselves to a leaf, enter into the pupal 

 stage, and finally emerge as perfect files in a very few 

 days. 



Ichneumon Fly (Pimpla instigator).— There are 

 several kinds of Ichneumon flies, but all are alike in their 



[IMuito: J. G. BlaUey. 



HOVKUING FLIES AM) LARVM-:. 



Several specios of Hov<^rin<j or Hawk Flies feed upon a.pliidcs. In the 

 ?entre the larva and inipa arc <sho\vn. 



general habits. They vary in size from an inch long to 

 that of a midge. All have more or less slender bodies, 

 furnished with an ovipositor similar to the sting in the 

 wasp. These insects alight on the bodies of caterpillars, 

 pierce them with their ovipositor, and then deposit an egg, 

 which in due course hatches and produces a grub, that 



