Black beetle.
Still on the Water of Leith, same stretch in fact, this is a killing fly. This is one of the originals tied 13 years ago - I'm not sure I've caught a fish on one since, but it's still in my box because it's going to happen again.
Tying instructions:
size 10, black thread, black seal body, palmered black hen front 1/3, black Raffene back.