Another great fly by Dick Brown, I call this one the “Sparkplug”, because that’s what it sounds like when it lands. Plus, it’s pretty dang bright underwater. It’s a HUGE pain to tie (for a primitive saltwater fly tier) but bones sure do love it. Check out tying instructions here.
I fish this pattern in the deep “white holes” during flood tides when the bones are cruising for crabs and sandfleas and the water is a little milky. I like to cast it a good bit ahead of the fish and wait till it gets close to strip. Usually this one works well with the classic strip-pause-strip retrieve. Feel for the take in that deeper water.