FIG. 166. Life Histories of Insects. 



L, P, and A, larva, pupa, and adult, respectively of water beetle (Dytiscus 

 marginalis) ; /, p, a, larva, pupa, and adult of blue-bottle fly (Hhisca 

 itorin); fl,fl> a 1 , larva, pupa, and adult of Cosstts Hgnipcrda. 



