Hook Standard emerger/nymph hook (Dai-Riki 125 or TMC 2487), 16-24
Thread Light olive UTC 70
Materials
Tail Dyed mallard flank fibers (BWO/wood duck) (1 small bunch)
Abdomen Working thread (light olive) (wrapped)
Wingcase Dyed mallard flank fibers (reserved from tail)
Thorax Olive dry-fly dubbing (Baetis/BWO) (pinch)
How to tie it
Start thread and tie in a small bunch of dyed mallard flank fibers at the bend; the butts are left long and folded forward later as the wingcase.
Split a few fibers as a short tail (about one-third shank), then wrap the thread forward to build a slim, segmented olive abdomen up to the front third.
Reposition the reserved mallard flank butts pointing rearward over the thorax area to form the wingcase.
Dub a small olive thorax just behind the eye.
Pull the mallard flank wingcase forward over the thorax and tie down behind the eye, leaving a few fiber tips as a stubby emerging-wing bud.