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.
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
The size of the head compared to the body in this larva is surprising, and I think this means it's a fairly early instar of something which is going to get a lot bigger, but I'm not sure.
Litobrancha on May 13, 2007May 13th, 2007, 7:19 am EDT
can't tell how much mesonotum sclerites are emarginated but has the horsehead look of Neophylax. case too. legs are long too. don't know any of the other uenoids.