Hends BL599 sizes 16/18/20 hooks. Uni-thread 8/0 dark brown. Toho 15/0 silver lined crystal clear glass seed bead. 2 fibres (1 for size 20) of pheasant tail for the body ribbed with fine dark copper wire. Thorax of dubbed blue under fur of a rabbit. Wing case of pheasant tail fibres. [Note – this nymph is based on a small Cove nymph with a silver lined crystal clear seed bead to imitate the air bubble of a midge pupa rising to the surface – similar to the ‘Mercury’ series of flies created by Pat Dorsey, a guide & author based in Colorado, USA.]