Ray, My nymph patterns for stoneflies: woolly buggers and woolly worms. Match the colors, but if in doubt black or olive work well. Also, match the length. I think the Hare & Herl Buggers I tie work the part for the generally smaller stoneflies in the northeast. You have the recipe, right?
Peter
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Peter F
www.fishingwithflies.com
pfrailey@hotmail.com