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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.

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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Millcreek has attached these 4 pictures to aid in identification. The message is below.
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on Jul 18, 2016July 18th, 2016, 7:31 pm EDT
This is a diving beetle larvae of the Dytiscidae family. I don't know the genus or species. Got it in an area of slackwater in the Russian River. Collected on April 1, 2016. The length is approximately 25 mm.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
Martinlf
Martinlf's profile picture
Moderator
Palmyra PA

Posts: 3047
Martinlf on Jul 18, 2016July 18th, 2016, 7:56 pm EDT
Cool critter. Love your photos! Thanks for posting.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on Jul 19, 2016July 19th, 2016, 8:34 am EDT
Louis - Thanks. Also, I think I've got the genus figured out. It's probably an Agabus.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

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