Not well known here in the States, the Monkey Bum is a highly effective fly. Created by an Australian guide, the Monkey Bum is an easy to tie emerger. I have been using it lately with great success. When I've worked a pool to the point of shutting it down, I switch to this fly and the fish begin to start biting again. My version is slightly different from the original since I those were the materials I had on hand but the original material is listed below in parenthesis. Just dab good glob of floatant on the post only when your ready to fish and good luck.
Hook: TMC2487 (Kamasan B100) size 10-14
Post: Hi-Vis Pink (Neer Hair)
Abdomen: Black floss (Dark Brown Uni-flex)
Tail: 3-4 strands of pheasant tail fibers
Thread: Black thread 6/0