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Caddisfly bait. Frontpiece plate of artificial flies from Bowlker's Art of Angling Key to flies No Red Fly Blue Dun March Brown Cowdung Fly Stone Fly Granam or Green Tail Spider Fly Black Gnat Black Caterpillar Little Iron Blue Yellow Sally Canon or Down Hill Fly Shorn Fly or Maiiow Buzz Yellow May Fly or Cadow Grey