in \r. xxi. 



BENEFICl \I. INSI ■' i 5. 



I , I'm i 11, of Aproarema nerteria. The small figure shows the 



natural size, (< (riginal.) 



is tl Ivantageous to the injurious pest. On the whole, 



however, the activities of parasites are decidedly beneficial. 

 Parasites arc found amongst the members ol most oi the 

 Orders of Insects but the parasitic Hymenoptera and Diptera are 

 the most important. Amongst the 1I> menoptera, several very exten- 

 sive families (Ichneumonidae, Chalcididae, Proctotrypidae, etc. ) 

 are entirely parasitic as are also the Tachinidae and Bombylidae 

 amongst the Diptera. Animal parasites (Hippoboscidas, Nycteri- 

 biadae, etc.) are not included here. 



\ / 



IK. Xanthopimpla pedator. , outline 



figure shows the natural inal. » 



• It must again be |><.inwil out thai ii is impossible to give more tl 

 of facts in a book of this character. In the present chapter tl 

 * |i families and groups nuisi necessarily be a 



