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 seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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Troutboomer on Mar 23, 2010March 23rd, 2010, 2:19 am EDT
There are grannoms aplenty in the Bald Eagle, however by May 20th there are no grannoms on any of our central Pa streams. More likely Ryacophila (green rock worms)size 14/12, which can emerge throughout late April and May, or Hydropsyche,size 16/18 with a tan wing and a cinnamon body. The trout behavior you describe is common on the Little Juniata. In either case, fishing a pupa in the film is the way to go, especially for Hydropsyche. They spend hours struggling in the film before emerging.
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