26 Bulletin 172. 



jects a minute, light-brown, fan-shaped organ, which is the cephalic 

 opening of the breeding tubes ; tlie caudal openings of these tubes 

 or trachea form two peculiar, light-brown, slightly elevated, slit-like 

 openings on the caudal end of the body. The mouth-parts consist 

 of two black, minute, sharp, rasping jaws which usually project 

 slightly from the pointed head. 



We have as yet found no characteristics by which we can distin- 

 guish these cherry maggots from that common pest of the apple — 

 the apple maggot. And we are not yet sure that this new cherry 

 p.5st is not the apple maggot in a new role. 



These maggots, which spend practically their whole life in the 

 flesh of the cherry, are the only stage of the insect with which the 

 consumers and most of the growers of the fruit will become familiar. 



The maggots hatch from eggs laid by a pretty little fly, resem- 

 bling in shape, but somewhat smaller than the common house-fly. 

 We cannot know with absohite certahity just what kind of a fly is 

 the parent of the cherry maggot until some of the maggots now in 

 our breeding cages transform into the fly, and this will not take 

 place until next spring. But for reasons to be given later on in dis- 

 cussing the identity of this new pest, we think that the adult form 

 of it is the fly, shown natural size and enlarged, in figure 12. The 

 body of this fly is black, and its head and legs are of a light yellow- 

 ish-brown color ; the lateral borders of the thorax are light yellow ; 

 the caudal borders of the segments of the abdomen are whitish ; the 

 wings and the scutellum are crossed by four blackish bands and 

 have a blackish spot at their tip ; this spot is sometimes confluent 

 with the nearest band, as shown in the enlarged figure of a wing in 

 the lower part of figure 12. The peculiar arrangement of these 

 markings on its wings serves to easily distinguish this fly from any 

 of its near known relatives. 



One cherry grower tells us that he saw many of these flies on his 

 trees when the fruit was being picked. He stated that the flies 

 were then somewhat sluggish in their movements, often alighting 

 on the picker's hand. Tlieir black-banded wings render these flies 

 quite conspicuous objects as they flit about from cherry to cherry, 

 60 that cherry growers should be able to familiarize themselves with 

 the adult or fly stage of this new enemy. 



