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.

Stream photos

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Hydropsyche (Spotted Sedge) Caddisfly Larva Hydropsyche (Spotted Sedge) Caddisfly Larva

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington

With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.

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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 Hydropsyche (Spotted Sedge) Caddisfly Adult Pictures

This was identified by Dave Ruiter as Hydropsyche californica or Hydropsyche occidentalis, but the characteristics were not clear enough to tell them apart.

Lateral view of a Male Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho

Dorsal view of a Male Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho

Male Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho

Ventral view of a Male Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho

Every ruler mark is 1/16 inch.

Ruler view of a Male Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho The smallest ruler marks are 1/16".

This caddisfly was collected from the Henry's Fork of the Snake River in Idaho on August 11th, 2018 and added to Troutnut.com by Troutnut on June 12th, 2019.

Discussions of this Adult

Hydropsyche species

2 replies

Posted by Creno on Jun 14, 2019

Last reply on Jun 14, 2019 by Creno

cannot be sure - californica or occidentalis

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