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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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Male Epeorus (Little Maryatt) Mayfly Dun Pictures

This Epeorus dun managed to emerge successfully even though it had apparently long several legs at some point and only partially grown them back.

Ruler view of a Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York The smallest ruler marks are 1 mm.
Lateral view of a Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York
Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York
Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York
Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York
Dorsal view of a Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York
Ventral view of a Male Epeorus (Heptageniidae) (Little Maryatt) Mayfly Dun from the West Branch of the Delaware River in New York

This mayfly was collected from the West Branch of the Delaware River in New York on May 15th, 2007 and added to Troutnut.com by Troutnut on May 18th, 2007.


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Male Epeorus (Little Maryatt) Mayfly Dun Pictures

Collection details
Location: West Branch of the Delaware River, New York
Date: May 15th, 2007
Added to site: May 18th, 2007
Author: Troutnut
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