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 



