Cherry picking thru Bruce Staples' Flies for the Greater Yellowstone Area, this one's Kelly Glissmeyer's whitefish slayer (should work for trout, too). Kelly has come out with many effective, easy to tie flies; here's his SBS.

hook - Dai Riki 135 #14
thread - Danville 6/0 brown
rib - brassie wire chartreuse
tail/shellback/wingcase - pheasant tail
abdomen - Ice Dub pearl
thorax - Ice Dub brown/olive
legs - partridge dyed olive
bead - 7/64 copper

Regards,
Scott