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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 Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington
This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
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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Sweltsa onkos (Sallfly) Stonefly Adult Pictures

Ruler view of a Sweltsa onkos (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #62 in New York The smallest ruler marks are 1 mm.
Lateral view of a Sweltsa onkos (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #62 in New York
Sweltsa onkos (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #62 in New York
Sweltsa onkos (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #62 in New York
Sweltsa onkos (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #62 in New York
Sweltsa onkos (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #62 in New York
Dorsal view of a Sweltsa onkos (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #62 in New York
Ventral view of a Sweltsa onkos (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #62 in New York

This stonefly was collected from Mystery Creek #62 in New York on May 15th, 2007 and added to Troutnut.com by Troutnut on May 18th, 2007.

Discussions of this Adult

Ontario Sallfly
Posted by GONZO on Sep 9, 2008
Last reply on Sep 9, 2008 by GONZO
I believe this is probably Sweltsa onkos. There are three Sweltsa species commonly listed for most of the Northeast (onkos, naica, and lateralis), and their individual pronotum/head markings seem rather distinctive.

Start a Discussion of Adult

Sweltsa onkos (Sallfly) Stonefly Adult Pictures

Collection details
Location: Mystery Creek #62, New York
Date: May 15th, 2007
Added to site: May 18th, 2007
Author: Troutnut
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