LEPTOGASTER. Slim Fly. 



I. L. liistrio. y% in.; chest reddish l)iou'n, with three lihick stripes; body brown, with -white bands and 

 yellow legs ; hind legs with brown bands. 



HYBOS. Hunchback Fly. 



I. H. thoracicus. % in. ; brown, with yellow shanks; wing smoky, with brown edge spot. 



Family 18. EMPID/E. Dance Flies. They dance and hunt in swarms on sha<ly brooks, and feed on 

 insects. Their grubs live on decaying vegetable matter. 



RHAMPHOMYIA. Bill Fly. 



1. R. cilipcs. }{ in. ; gray, with four stripes on chest and white hairy hind shanks. 



2. Ji. amcricana. ^ in. ; slate gray, with yellow legs. 



3. R. scolopacea. ^-^ in. ; blackish gray ; chest faintly striped ; body silvery ; legs brown. 



HEMERODROMIA. Catch Fly. 



I. //. superstitiosa. ys in. ; whitish, with liroad black stripe on chest and body. 



TACHYDROMIA. Race Fly. 



I. T. fenestrata. ]•?, in. ; black, with yellow legs and black stripe on shanks. 



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