Fic. 185.—Life histories of Insects. 
L., P., and A., larva, pupa, and adult respectively of water-beetle (Dytiscus 
marginalis); 1, p., @., larva,‘pupa, and adult of blue-bottle fly (Musca 
vomitoria); 1.1, 2.1, 4.1, larva, pupa, and adult of Cossus ligniperda, 
23 
