The Green McKenzie Caddis should be hatching in the next week or so. This large green caddis adult tends to flop around on the surface and the CDC hackle on this imitation kicks off a lot of action and the fish love it. You want to get the CDC fibers splaying off the stem — the more CDC the better. You gotta see how this looks underwater — this post on McKenzie Green Caddis on WestFly has a great shot.
CDC Green McKenzie Caddis pattern:
Hook: TMC 100 or Gamakatsu F10 size 8-12
Thread: Uni 6/0 olive or green
Body: 2mm thin foam, green
Rib: Thread or Mono
Hackle: CDC fibers, dun
Wing: Natural Deer or Yearling Elk