The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
This video re-confirms my thinking for how the emerger pattern should look...
Have you bug nuts seen the Ralph Cutter's DVD Bugs of the Underworld?
As the dun emerges further the nymph body lifts up against the underside of the film. When the dun is almost escaped (usually with one or both wings out) the nymphal husk is trailing behind horizontaly - sometimes just under, sometimes in the film.
That is exactly the transition state I am trying to imitate.
Guys, some anglers may think we are nitpicking these various stages of emergence, but it does make a difference. Since both stages of the transition are usually only measured in seconds, you wouldn't think the trout would care. But they do - and often enough that it's worth carrying both styles.
Henry's Fork? So you've spent a lot of time there? I thought you're profile photo looked like a pretty wide expanse of water for WI...:)