The Mahogany, and the better-known Black nymphs were developed by Don Martinez, owner of one of the early shops in West Yellowstone and the man who introduced the Wooly Worm to trout fishing in the Yellowstone area in the 30's (it had been mainly a bass fly). The Mahogany, apparently, never received the attention it's sibling did due to a shortage of brown partridge feathers; pity, it's a cool looking fly.
hook - Mustad 9671 #12
underbody - non-tox wire .025
thread - Danville 6/0 dark brown
tail - partridge
rib - fine oval tinsel gold
abdomen/thorax - rabbit/angora goat mix chocolate brown
wing pad - quill fibers orange original pattern called for raffia (or swiss straw), neither of which I have in orange (or green for the Black)
legs - partridge
Part 1
mash barb, wrap front of shank with non-tox
start thread, wrap underbody, taper front and back
tie in ribbing and wrap back to point above barb
measure a clump of partridge (hook gap past bend) and tie in
dub thread, dub tapered abdomen (take a turn behind the ribbing) to 60% mark
counterwrap rib, tie off at 60% mark