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.
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This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
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This is the first Rhyacophila larva I've seen with this striking black banded appearance. I caught several larvae of this species in a fast riffle in a mid-sized trout stream.
GONZO on Apr 3, 2007April 3rd, 2007, 7:08 am EDT
Pretty sure that the dark bands and the proleg configuration indicate mainensis.
Litobrancha on Jun 12, 2007June 12th, 2007, 8:14 am EDT
what a beautiful specimen. never seen that one, thanks!