▁length ▁of ▁. ▁These ▁tiny ▁k iller ▁f lies ▁have ▁a ▁pale ▁brown ish ▁or ▁grey ish ▁body , ▁with ▁big ▁re dd ish ▁eyes . ▁An ten na e ▁and ▁legs ▁are ▁yellow ▁in ▁males . ▁Fem ales ▁have ▁brown ish ▁fr ons , ▁with ▁a ▁golden ▁o cell ar ▁triangle . ▁An ten na e ▁and ▁fem ora ▁are ▁black ▁and ▁the ▁ab d omen ▁shows ▁distinct ▁black ▁bands , ▁that ▁are ▁missing ▁in ▁the ▁males . ▁ ▁Bi ology ▁Co en os ia ▁at ten u ata ▁is ▁a ▁very ▁effective ▁general ist ▁pred ator ▁of ▁insect s , ▁usually ▁small ▁f lies ▁( B em is ia ▁tab aci , ▁Tri ale uro des ▁v apor ari orum , ▁B acter ic era ▁co cker elli , ▁Brad ys ia ▁species , ▁Li ri omy za ▁species , ▁D ros oph ila ▁species ), ▁but ▁also ▁small ▁h ymen optera ▁( Enc ars ia ▁form osa ). ▁Pot ential ▁pre y ▁are ▁caught ▁only ▁in ▁mid - air ▁with ▁its ▁front ▁legs . ▁The ▁preferred ▁pre y ▁in ▁green h ouses ▁is ▁the ▁dark - wing ed ▁fung us ▁g nat ▁( S ci ar idae ) ▁ ▁This ▁species ▁is ▁considered ▁an ▁important ▁bi ological ▁control ▁mechanism ▁against ▁some ▁plant ▁p ests , ▁including ▁fruit ▁f lies ▁and ▁other ▁common ▁green house ▁p ests . ▁It ▁has ▁also ▁shown ▁promise ▁as ▁a ▁bi ological ▁control ▁agent ▁of ▁fung us ▁g nats , ▁shore ▁f lies . ▁ ▁References