70 INSECT TRANSFORMATIONS. 



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

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

 winged fly (Tephrilis Serratulce? ) 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 Serratula ?) 6, 

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

 pf Senecio clegans, d <Z, mined leaf of Cineraria entente. 



