A good Callibeatis imitation; seems like every time I try to fish Hebgen or any of the Blackfeet lakes when these bugs are around I'm fighting wind with green water coming over the bow. Not a lot of materials and pretty simple and quick to tie. Tied this one unweighted; lead-free wraps in the thorax or a beadhead if you're looking for something a bit heavier. hook - Mustad 9671 #12 thread - Uni 8/0 camel tail/shellback - pheasant tail fibers abdomen - ostrich herl (actually came from a feather duster) rib - copper wire x-small thorax -ostrich herl wingcase/legs -pheasant tail fibers mash barb and attach thread and wire at 60% mark; keep tag end of wire on far side of hook bend wrap wire back to point above hook barb tie in a few ostrich herls and return thread to 60% position (normally I'd tie in the tail first but twisting the ostrich generates a bit of torque and I've had trouble keeping the tail in line; doing it afterwards alleviates any twisting and doesn't take any longer) twist herl together and wrap forward measure some pheasant tail fibers (extend abdomen length behind the butt) and tie in ahead of abdomen trim pheasant butts, hold fibers against the body and start wire rib forward continue rib through abdomen, tie off and helicopter the end measure another clump (8-10) of pheasant tail fibers (abdomen distance) and tie in 1 hook eye width back from eye; from this point, the tying steps are pretty much like the Turkey Tail nymph wrap back to end of abdomen tie in some more ostrich herl twist herl and wrap forward 1 hook eye width back from eye divide protruding fibers pull pheasant butts forward to form wingcase; tie off and trim fold near side legs back and tie down repeat on far side whip finish, SHHAN and you're done Regards, Scott