CONTROLLING INSECT PESTS 



409 



and leaf-feeding larvae take the eggs into their alimentary canal 

 where they hatch. The parasites then bore their way into the 



FIG. IQI. A preda- 

 ceous g r o u n d-b e e 1 1 e, 

 C a lo s o m a sycophanta. 

 (Natural size.) 



FIG. 192. A tachina-fly, 

 Blcp/iaripcza adusta, the larva 

 of which is an internal para- 

 site. (About twice natural 



size.) 



body tissues of the host. The parasitic Hymenoptera, which 

 include some of the best known and most important of the 

 parasites and which comprise hundreds of different kinds, 



FIG. 193. Braconid cocoons on a caterpillar that has been killed by the 

 parasites. (About natural size.) 



each attacking its own particular single or few host kinds, 

 have been discussed in Chapter XVII. 



