DROSOPHILA. Apple Fly. 



i. D. ampelopliila. ft in. Pomace or Wine Fly. Yellowish. Found about wine or cider vats, 

 and live on decaying fruit. 



PHORID^E. Hump-backed Flies. 

 Phora, Minute flies, found sometimes on windows, sometimes flying and dancing in swarms. 



Family 30. GESTRID/E. Gad or Bot Flies. Large bee-like flies with very small mouths ; parasitic on 

 animals. 



(ESTRUS. Bot Fly. 



1. CE. ovis. Sheep Bot Fly. y 2 in.; brown, smooth ; body checkered. Lays its eggs in the 



nostrils of sheep; from there the maggots, when hatched, creep up the passages of the 

 nose and fasten themselves in the chambers of the forehead. 



2. (. phobifcr. ^4 in.; black; chest and tail-end reddish ; wing black banded. 



QASTROPHILUS. Horse Bot Fly. 



1. G. equi. y? in.; pale yellow, spotted with red : chest banded with black ; wing 



spotted. It lays its eggs on the knees of horses : the hatched maggots irritate 

 the horse, which licks the infested spot and gets the maggots into his mouth, 

 and from there they crawl into his stomach where they fasten themselves and 

 stay until full grown, passing out with the excreta. 



2. G. hamorrhoidalis. % in. ; red tail. Lays its eggs on the lips of the horse. 



3. G. vcfcrinus. The Farrier Bot Fly. ^ in. ; brown. Lays its eggs under the throat of the horse. 





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