The Li ttie Fruit Flies 



around the refuse of cider mills and fermenting vats of grape 

 pomace. Forbes has stated that in 1884 they damaged the grape 

 crop at Moline, 111. They attacked most frequently the grapes 

 which had been mutilated by birds or damaged by rot, but, 

 having once commenced on a cluster, they passed from one berry 

 to another, the flies meanwhile constantly laying eggs. 



A brood of these flies may develop in twenty days. I have 

 recently shown that these flies are attracted to dangerously foul 

 substances, and that they may be responsible for the spread of 

 certain diseases. 



The larva of Scaptomy^a flaveola (Meig.) makes blotch mines 

 in the leaves of radishes 



186 



