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.

The "Fountain Flats" stretch of the Firehole was fishable in the morning after an uncharacteristically cold August night.

From the Firehole River in Wyoming

Stream photos

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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

This seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.

7 Recently Added Photos

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.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Hesperophylax (Silver Striped Sedge) Caddisfly Larva Pictures

Based on both range maps and key characteristics, this larva is either Hesperophylax designatus, Hesperophylax alaskensis, or Hesperophylax occidentalis. However, the species key in Parker & Wiggins (1985) cannot separate these species as larvae.

Hesperophylax (Limnephilidae) (Silver Striped Sedge) Caddisfly Larva from the South Fork Snoqualmie River in Washington

Case view of a Hesperophylax (Limnephilidae) (Silver Striped Sedge) Caddisfly Larva from the South Fork Snoqualmie River in Washington

Ruler view of a Hesperophylax (Limnephilidae) (Silver Striped Sedge) Caddisfly Larva from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.

Dorsal view of a Hesperophylax (Limnephilidae) (Silver Striped Sedge) Caddisfly Larva from the South Fork Snoqualmie River in Washington

Ventral view of a Hesperophylax (Limnephilidae) (Silver Striped Sedge) Caddisfly Larva from the South Fork Snoqualmie River in Washington

This caddisfly was collected from the South Fork Snoqualmie River in Washington on June 13th, 2019 and added to Troutnut.com by Troutnut on June 15th, 2019.

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References

Parker, C. R., Wiggins, G. B. 1985. The Nearctic Caddisfly Genus Hesperophylax Banks (trichoptera: Limnephilidae). Canadian Journal of Zoology 63(10): 2443-2472.