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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington
This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Here's a "water penny" (a Psephenidae beetle larva) crawling around on a real penny.

Artistic view of a Psephenus (Psephenidae) (Water Penny) Beetle Larva from Fall Creek in New York
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Jan 18, 2014January 18th, 2014, 7:59 am EST
I'm pretty sure there are no current flies tied specifically to imitate the Water Penny. I really don't know if they are a significant food source to trout. If I was to tie one I would just use a pair of those round Velcro tabs about 1/2" in diameter and put one tab on the bottom of the hook shank and add some glue and put the other half on top and press them together so the Velcro hook and loops mesh and the glue is distributed well. After the glue dried I could color the top and bottom with various waterproof pens and trim the diameter to match the size of the natural.
Catskill fly fisher for fifty-five years.
Afton, NY

Posts: 25
LowBudget on Jan 20, 2014January 20th, 2014, 6:28 am EST
Like many flies, my musings on a water penny larva fly was more about a fly for the fisherman than perhaps for the fish.

Now that I've had time to think about one, I am thinking about a round tab of brown leather (I have some from an old jacket) over a bit of light brown / white mohair mix.

I could envision a trout downstream of a disturbance of the stream bottom, caused by wading fishermen or a herd of deer, slurping up some random water pennies dislodged from their attachment to gravel and rocks.

Adding a pattern on top made by waterproof pens as Wbranch suggests would be a nice finishing touch.

Low Budget Fly Tying and Fishing author of "Behind the Fly"
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Jan 20, 2014January 20th, 2014, 5:26 pm EST
Well go tie up a couple and post pictures of your creations.
Catskill fly fisher for fifty-five years.

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