70 



INSECT TRANSFORMATIONS 



was transformed within the leaf, in a (ew days, into 

 a pupa, and beinjr put under a bell-glass, a small two- 

 winged fly {Tephi-itis Scrraliilcel ) made its appear- 

 ance in about a fortnight. In some garden-pots, in 

 another room of the same house, were exotic plants 

 of the American groundsel [Scnrcio elegans), the 

 leaves of which were crowded witli miners, whose 

 paths, however, were so very different as to indicate 

 a different species; but upon their transformation 

 into perfect insects, they turned out exactly the same. 

 They proved, indeed, to be the same with the leaf 

 miners of the swine-thistle {Sonchus oleraceus). 



^M 



W \ 



w*f 



Leaf-minins niajgofs. a, the fly (Tephritis Serratula ?) J, 

 mined leaf of sow-thistle (Sonchus olcractus). c c, mined leaf 

 otSenecio clcgans. d d, mined leaf of Cineraria crucnla. 



