Bead Head spider type flies are amongst the best flies for fishing fast rivers and streams. They are suggestive little flies and the combination of buggy shape, the peacock herl body, the movement of the soft hackle and the trigger of the hot butt often produce a hit. This mid water fly is suggestive of a drowned beetle. I tie the hot but in both fluoro fire orange and chartreuse as I find they are the best two trigger colours for trout. The orange works best either end of the river season and chartreuse comes into its own during the middle of the season when cased caddis are more prevalent.