hang just below the meniscus, like a comparadun or a
parachute pattern,

there is a great and simple pattern that works for any mayfly in this stage.

It's a CDC emerger. Uses a trailing shuck of brown zlon, sparse and about the
hook shank length tied on a light wire scud hook. Dub a slim body to match, tie
in a clump of CDC. The secret to the CDC is to strip it off the stem, say about
4 or 5 CDC feathers for a size 16-18. Lay the stripped feathers in a pile and
role them like you would be rolling them up in a cigarette paper (sans paper of
course), tie in the the clump in the middle about 2 eye lengths back from the
eye (in other words, normal position for a mayfly), then pull up and tie post
style. Dub around the the CDC up to the eye.

Then pull the clump toward the hook bend and trim (this gets the approximate
length).

Floats like a cork, can be fished as a dry upstream, or down, then let sink
below the surface and fished like an emerger.

killer pattern. No need for any floatant ever. When the CDC gets wet, a few
false casts clears the water and your good to go.

-- Rob