ORDER DIPTERA 



251 



The serpentine leaf -miner (Agromyza pusilla) is the com- 

 monest and possibly the most widely distributed species of 



Fig. 77. The serpentine leaf -miner, Agromyza pusilla. 1, mine on nas- 

 turtium (original); 2, adult (after Webster and Parks); 3, mine on clover, 

 (original). 



this family. It is a general feeder and has a great variety of 

 hosts, mining at least fifty-five species of plants. An excel- 



