EXPANSION OF PEUFECT INSECTS. 



337 



A, the dragon-fly, beginning to escape from the pupa; a, the flv; 4,ihe 

 pupa case. B, the process lunher advanced; r. the flv; d. the pupa 

 case. C, the fly nearly free, an.l forming an arch; ., the flv;/, the 

 pupa case. D, the fly bending back its bodv.so as not to obstruct the 

 expansion of the wings. 



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