PLECOPTERA. 



91 



meridae (May-flies) and Thysanura on one side, while 

 the adults resemble the Platyptera. Orders 11. -IV. 

 all have aquatic larvae possessing curious adaptive char- 



Fig- 45- 



acters, especially in their breathing-organs, while the 

 adults live in the air, being as a rule good fliers. 



