CABBAGE BUTTERFLY 



139 



cabbage larva that is parasitized by the ichneumon fly usually 

 dies before it transforms into a chrysalis. The adult ichneumon 

 fly emerges from its cocoon in a week or ten days. It is not 



FIG. 75. Imported parasite of the cabbage butterfly 

 Apanteles glomeratus 



Open cocoon, adult insect, and mass of cocoons near parasitized larva. 

 Highly magnified 



known how long it lives or how many generations occur in a 

 year. The fact that it is holding the butterfly in check in some 

 localities would lead to the belief that it multiplies more 

 rapidly than its host. 



