EXPANSION OF PERFECT INSECTS. 



A, the dragon-fly, beginning to escape from tlie pupa ; a, the fly ; 

 b, tne pupa case. B, the process further advanced ; c, the fly ; d, 

 the pupa case. C, the fly nearly free, and rormiu;,'.inarc]i ; J, the 

 fly ; /, the pupa case. 1), the fly bending bavk its body, so as not 

 to obstruct the expansion of the winys. 



