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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Dorsal view of a Grammotaulius betteni (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This is a striking caddis larva with an interesting color pattern on the head. Here are some characteristics I was able to see under the microscope, but could not easily expose for a picture:
- The prosternal horn is present.
- The mandible is clearly toothed, not formed into a uniform scraper blade.
- The seems to be only 2 major setae on the ventral edge of the hind femur.
- Chloride epithelia seem to be absent from the dorsal side of any abdominal segments.
Based on these characteristics and the ones more easily visible from the pictures, this seems to be Grammotaulius. The key's description of the case is spot-on: "Case cylindrical, made of longitudinally arranged sedge or similar leaves," as is the description of the markings on the head, "Dorsum of head light brownish yellow with numerous discrete, small, dark spots." The spot pattern on the head is a very good match to figure 19.312 of Merritt R.W., Cummins, K.W., and Berg, M.B. (2019). The species ID is based on Grammotaulius betteni being the only species of this genus known in Washington state.
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.

Male Limnephilus externus (Summer Flier Sedge) Caddisfly Adult Pictures

Lateral view of a Male Limnephilus externus (Limnephilidae) (Summer Flier Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
Ventral view of a Male Limnephilus externus (Limnephilidae) (Summer Flier Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
Male Limnephilus externus (Limnephilidae) (Summer Flier Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
Male Limnephilus externus (Limnephilidae) (Summer Flier Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho
Each measurement mark is 1/16".

Ruler view of a Male Limnephilus externus (Limnephilidae) (Summer Flier 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

Limnephilus externus
Posted by Creno on Jun 14, 2019
Last reply on Jun 14, 2019 by Creno
male

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References

Male Limnephilus externus (Summer Flier Sedge) Caddisfly Adult Pictures

Collection details
Location: Henry's Fork of the Snake River, Idaho
Date: August 11th, 2018
Added to site: June 12th, 2019
Author: Troutnut
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