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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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Leskorcala has attached these 3 pictures to aid in identification. The message is below.
Posts: 16
Leskorcala on Jun 17, 2020June 17th, 2020, 6:46 am EDT
i collected yesterday from Montana's Bitterrroot river drake may fly I believe is green drake Ephemerella grandis , many confused with Gray Drake but in June we do have Green drakes here first and than Gray later towards August. Problem is that you dont see much green tones on the body , more like dark gray in my opinion, Wanted to pick few brains if that is in fact Green drake ?
Healdsburg, CA

Posts: 344
Millcreek on Jun 17, 2020June 17th, 2020, 8:37 am EDT
It isn't Ephemerella grandis now known as Drunella grandis because it has two tails rather than three. It's probably a Siphlonurus species otherwise known as a Gray Drake.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
Partsman's profile picture
bancroft michigan

Posts: 321
Partsman on Jun 17, 2020June 17th, 2020, 10:41 am EDT
Thanks Millceek for the identification on that bug, I witnessed a hatch last night that brought up some nice fish. I could not identify the bugs, but the fish liked them. They were very similar to the above bug, but on the water at 9:30 pm who nows
Jmd123's profile picture
Oscoda, MI

Posts: 2474
Jmd123 on Jun 17, 2020June 17th, 2020, 10:47 am EDT
So Mike, just how good did you do?

No matter how big the one you just caught is, there's always a bigger one out there somewhere...
Posts: 16
Leskorcala on Jun 17, 2020June 17th, 2020, 2:29 pm EDT
thanks for quick replay , appreciate your expertise. I wanted point out that this Gray drake has less bulkier or say more robust body as Green Drake I have seen on Henry's Fork over the years.Green drakes i have seen are quite larger than of Gray drake

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