Glass Bead Midge Black. The Glass Bead Black Midge Nymph is a superb midge imitation that can create truly fabulous results in both the early and late trout season. The Glassbead Midge Black has brilliant capabilities in all conditions of water especially those small quiet stretches where the hungry trout likes to lunch. The Black Midge is a fly coveted by trout fisherman across North America. Black Midge. The Glass-Bead Black Midge is a fly of deadly capabilities in the right hands. A complicated fly to fish as it requires one to be delicate and deliberate. The Glass Bead Black Midge is a superb fly for those smooth stretches of water, or quiet back streams. A necessity for every trout fisherman's tackle box. Although small in size the Glass Bead Black Midge can produce trophy fish time after time.