Family 15. THEREVID/E. Stiletto FlieS. Live near the grouiul ancl prey on other insects. Their 

 hirviv live in fnngi or mould. 



THEREVA. Stiletto Fly. 



1. T. frontalis. '4 in. ; black; chest with two yellow stripes; bodv with vellow bands. 



2. T. nigra. j\ In. ; black ; body with white edges. 



Family 16. MIDAID/E. .Midas Flies. They prey on other insects, and are easily known among flies by 

 the unusually long feeler, with a knob on the end. Their larva' live in rotten stumps. 



MIDAS. 



1. .1/ tibia/is. i 's in.; black, with vellow shanks and feet; wing 



brown. 



2. M. clavatus {Jilalus). ^ to i "^ in. ; black; second ring of body 



yellow ; wing smoky black. 



3. .1/. iopterzts. Js in. ; Idack ; sides and two spots on body yellowish ; 



wing steel blue. 



4. .1/ fiilvifro>is. J^ in. ; black ; middle of body orange. 



Family 17. A5IL1D/E. Flics of Prey. Robber Flies. They live on various insects and caterpillars, 

 and even a bumblebee or dragon-fly has to succumb to their strength. Grabbing their prey with their strong 

 legs, they suck out its juice, and leave but the shrivelled skin. Their larva; live underground in roots or rotten 

 wood, where they feed on other grubs. 



DIOCTRIA. Hawk Fly. 



I. /y. octofunclata. '{ in. ; black ; chest with yellow stripes ; body with four white spots on each side ; legs 

 vellow. 



(30) 



