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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 Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington
This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
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 vitreus (Sulphur) Mayfly Spinner Pictures

Lateral view of a Male Epeorus vitreus (Heptageniidae) (Sulphur) Mayfly Spinner from Penn's Creek in Pennsylvania
Male Epeorus vitreus (Heptageniidae) (Sulphur) Mayfly Spinner from Penn's Creek in Pennsylvania
Dorsal view of a Male Epeorus vitreus (Heptageniidae) (Sulphur) Mayfly Spinner from Penn's Creek in Pennsylvania
Ruler view of a Male Epeorus vitreus (Heptageniidae) (Sulphur) Mayfly Spinner from Penn's Creek in Pennsylvania The smallest ruler marks are 1 mm.

This mayfly was collected from Penn's Creek in Pennsylvania on May 26th, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.

Discussions of this Spinner

Probably another E. vitreus
Posted by GONZO on Oct 28, 2008
Last reply on Oct 28, 2008 by GONZO
This looks like a male vitreus spinner. Although blurry, the terminalia look about right. The dark humeral vein and the little dark marks on the middle rear of segments 3-5 and 7-9 also seem to fit.

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References

Male Epeorus vitreus (Sulphur) Mayfly Spinner Pictures

Collection details
Location: Penn's Creek, Pennsylvania
Date: May 26th, 2007
Added to site: June 4th, 2007
Author: Troutnut
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