Fig. 40. One of the Greatest Friends of the Forest 



Upper figure, ichneumon fly : d, as an adult fly ; a, b, as a grub. Lower figure, 

 destruction of caterpillar l)y ichneunion : «, caterpillar with eggs of ichneumon 

 (white on dark area) ; b, egg (enlarged) ; c, dark area with eggs (enlarged) ; 

 d, larvjE of ichneumon feeding on pupa; e, pupa of oatei'pillar destroyed, 

 larvae of ichneumon in pupa state 



127 



