70 



[NSECT TRANSFORMATIONS. 



was transformed within the leaf, in a few days, into 

 a pupa, and being put under a belt-glass, a small two- 

 winged fly (Tephritis SerratulcB?) 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 (^Senecio elegans), the 

 leaves of which were crowded with 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). 



Leaf-mining maggots, a, the fly {Tephritis Scrratulrv ?). 

 b, mined leaf of sow-thistle (^Sonchus oleraceus'). i\ mined leaf 

 of Senecio elegans. d d. mined leaf of Cineraria cruanta. 



