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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.
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Report at a Glance

General RegionWI - SW
Specific LocationTimber Coulee / WB Kickapoo / Big Green River
Dates Fished8/26/06 & 8/27/06

Details and Discussion


Posts: 3
Sasso on Aug 28, 2006August 28th, 2006, 9:07 am EDT
whoops! I was just going to chime in and mention that I've never found a reports website I really like... so I'm going to post here :)

Fished SW WI this weekend... beautiful misty weekend in Coulee Country. Left home w/o stream thermometer... air temps in low-mid 80s. Water a little hazy due to Friday's rains, but cleared by mid-saturday for the most part. No surface activity to speak of... tons of hoppers streamside, but not many making their way *into* the water. Kept slow & low working buggers & nymphs from the tall grass. Had never been on the Big Green before... a nice change of pace. Not as many fish but some nice fat ones. Hope to see more reports soon!
Troutnut's profile picture
Bellevue, WA

Posts: 2758
Troutnut on Aug 28, 2006August 28th, 2006, 10:11 am EDT
Thanks for the report! I've been seeing similar conditions here in upstate NY -- not a lot of bugs. It's typical for this time of year.

I'm going to take off for the Catskills for a few days later this week and hopefully have something really interesting to write about, and some nice new pictures.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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