This wonderful little pattern from fly tyer Mike Mercer is a great all-rounder that was originally designed as a crippled caddis fly, but it can be fished successfully under most hatches and conditions. Pay special attention to the proportions and amount of material, as it can be easily overdressed.
Hook: Mustad R50XAP # 14
Tying thread: Sheer 14/0 Olive
Rib: Single strand of Crystal hair Pearl
Thorax: Peacock dub Olive
Spent wing: Z-Lon
Hackle: Light Dun
Wing: Bleached elk hair