The Life of the Fly 



serves. Next comes the pupa, armed for the 

 exit even as the primary larva was equipped 

 for entering. When the deliverance Is ac- 

 complished, the perfect Insect appears, busy 

 with Its laying. The Anthrax cycle Is thus 

 divided Into four periods, each of which cor- 

 responds with special forms and functions. 

 The primary larva enters the casket contain- 

 ing provisions; the secondary larva consumes 

 these provisions ; the pupa brings the insect to 

 light by boring through the enclosing wall; 

 the perfect insect strews its eggs; and the 

 cycle starts afresh. 



no 



