18 



LEAF-MINING INSECTS 



larva cuts the swath across the end of the blotch mine, 

 doing all its cutting in one direction, scythe-like, across the 

 field, and at the end of its reach swings back idly to the 



Fig. 9. Diagrams of the mines and mining operations of a Dipterous 

 leaf -miner on Anemone. A, a leaf with three mines; B, a portion of a mine 

 enlarged; C, a smaller portion of the same, more enlarged;/), the "swing" 

 of the larva as it cuts successive "swaths." 



starting point, hitches up closer, and makes another cut. 

 And when the swath has reached the edge of the vein- 

 bordered field that is being harvested, the larva rolls over 



