The Bibio Hopper Size 12 is a highly effective, buoyant terrestrial dry fly with the black-and-red colours associated with Bibio and heather flies. Its leggy profile suggests a land-bred insect blown onto the water rather than an aquatic hatch.
Fish it along stillwater wind lanes, near banks and below overhanging vegetation. Let it sit naturally, adding an occasional twitch. It is especially useful when heather flies or hawthorn flies are present. Placed accurately, it gives you every chance of seeing a trout commit at the surface.