The Two-winged Flies 



349 



At cider-making and fruit-gathering time, and in vine-growing districts 

 at wine-making time, hosts of tiny yellowish-bodied flies, the pomace-flies or 

 fermenting fruit-flies, Drosophilidae, may be seen busily lapping up their 

 favorite food, the juices of fermenting fruits. 

 The most abundant and wide-spread species 

 is Drosophila ampelophila, the vine-loving 

 pomace-fly. It is a small, clear- winged, 

 red-eyed, brownish-yellow, chubby fly 

 which lays its eggs on gathered fruits, 

 and especially decaying fruit and pomace, 

 and also on grapes still hanging on the 

 vines if they have been broken somewhat 

 by birds The larvae or maggots hatch in 



FIG. 497. Trypeta longipennis. (Two 

 and one-half times natural size.) 



from three to five days, live in the fruit four days, and lie in the pupal 

 stage three to five days, so that a whole life-cycle is gone through in less 



FIG. 498 Larva of cherry-fruit fly, Rhagoletis cingulata, dorsal and lateral views. 

 (After Slingerland; natural size and much enlarged.) 



