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

Dinking around catching bugs in obscure Idaho waters

Dinking around catching bugs in obscure Idaho waters

By Troutnut on August 3rd, 2020
Continuing my exploration of some remote parts of central Idaho, I hiked into a little alpine lake called Green Lake above the Copper Basin and caught a 5-inch rainbow. There seems to be a naturally reproducing population of tiny rainbows there (I saw fry), but I saw no sign of big ones. Back at the trailhead, I collected some interesting bugs at the lake outlet.

Then I drove north quite a ways, touring some very remote roads. I collected some bugs from tiny creeks along the way, without stopping to fish.

Photos by Troutnut from Green Lake Outlet, Green Lake, and Squaw Creek in Idaho

Green Lake Outlet in Idaho
Green Lake Outlet in Idaho
Green Lake Outlet in Idaho
Green Lake in Idaho
Green Lake in Idaho
Green Lake in Idaho
Green Lake in Idaho
Green Lake in Idaho
Squaw Creek in Idaho

Closeup insects by Troutnut from Trealtor Creek and Green Lake Outlet in Idaho

Ameletus (Brown Dun) Mayfly Nymph
Dorsal view of a Ameletus (Ameletidae) (Brown Dun) Mayfly Nymph from Green Lake Outlet in Idaho
Baetis bicaudatus (BWO) Mayfly Nymph
The J-shaped light mark on the first femur and L-shaped marks on the next two are telltale signs of Baetis bicaudatus according to the original species description.

Dorsal view of a Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Green Lake Outlet in Idaho

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