70 



[NSECT TRANSFORMATIONS. 



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

 a pupa, and bein^ put under a bell-glass, a small two- 

 winged fly {Tephrilis Serratukp/^ ) 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 clegans), the 

 leaves of which were crowded with miners, whose 

 paths, however, were so very difterent 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. «, the fly {Tephritis Se7^-ntnla ?) b, 

 mined leaf of sow-tliistle (Sonchus ohraccus). c c, minetl leaf 

 of Senecio dcgans. d d, mined leaf of Cinerariu crtienta. 



