Few fly-fishers would be without this pattern evolved by one of the Midland’s most successful and skillful anglers, Arthur Cove. Although designated a nymph it has the outline of a midge pupa. The inventor fished the nymph very slowly indeed, with a floating line and a long leader. It also catches many fish inched slowly along the bottom in still water. It is a splendid fly to use when no fish are showing, and the depth at which it is to be fished can be easily adjusted until contact is made. This fly works equally well in the river, in stillwaters or reservoirs and makes a good point-fly when a team of three are used. It can be weighted or have different thorax materials, like fluorescent orange silk for instance, which act as a trigger point. There are many variants of this fly which has stood the test of time and is still very popular and an essential fly in most fly-boxes.