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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.

Dorsal view of a Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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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Updates from August 4, 2004

Updates from August 4, 2004

Closeup insects by Troutnut from Miscellaneous Wisconsin in Wisconsin

Female Stenonema modestum (Heptageniidae) (Cream Cahill) Mayfly Spinner from unknown in Wisconsin
This one was collected in in association with this male. It looks quite different, but that's often the case between spinner genders.
Male Stenonema modestum (Heptageniidae) (Cream Cahill) Mayfly Spinner from unknown in Wisconsin
Here's a goofy picture of a Caenis dun falling off the back of a leaf, never to be seen again.  These mayflies are very tiny and fragile, and very hard to capture and photograph without damaging. This little dun hatched from the nymph in a tub of nymphs while I was picking through for aquatic specimens to photograph... I grabbed the leaf it hatched onto and tried to take some pictures but it got away after about half a picture.

Female Caenis (Caenidae) (Angler's Curse) Mayfly Dun from unknown in Wisconsin

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