Found this on Troutnut; looks like a combination Last Chance Emerger and Hairwing Dun. Change color/size to suit your needs.
hook - Dai Riki 280 #10
thread - UTC 140 tan
tail - woodduck
shuck - Congo Hair beige
rib - Uni-Stretch brown
abdomen - dubbing tan
thorax - dubbing pale yellow
hackle - grizzly
wing - deer hair
Part 1
mash barb, start thread at 2/3 mark; wrap to point above barb
measure (gap width past bend) some woodduck fibers; tie in/trim
tie in some CH on top of tail; trim
tie in rib
dub thread/dub tapered abdomen to 2/3 mark
counterwrap rib; tie off/trim
tie in hackle (did it by the tip just to see how it'd look; I was pretty happy with the swept-back effect so I'll probably keep it this way for the next batch)