Sz. 12 Green Rock Worm
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Sz. 8 olive/brown knuckle dragger jig.
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Tom, I like your green rock worm. I've been working on some too, as I have found the same in my bug samples this time of year: lots of Hydropsyche and Rhyacophila Larvae.
These one's are more of a Hydropsyche, but I think all you would need to do for the Rhyacophila would be use a lighter (or brighter green) scud back and change the hook style to a longer curved shank, but otherwise same recipe.
A sample from the Yakima River in early March
Hydropsyche
Rhyacophila
I don't have a picture of this little green rock worm fly I was using last year (to imitate those smaller fluorescent green ones), but it is a simple tie. Veevus Iris thread in chartreuse for the body, colored with a bright green sharpie to make it just a little more green, and then coated with UV resin for durability and to make it colorfast. And then just some sparse, spiky blackish dubbing and a black tungsten bead. This one has become a go to for me for early spring through early summer on the Yak.