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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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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Jcatt72 has attached these 3 pictures to aid in identification. The message is below.
Jcatt72
Centre County, Pennsylvania

Posts: 1
Jcatt72 on Jun 22, 2012June 22nd, 2012, 2:46 pm EDT
Have a few pics of some bugs that were coming off the stream here in June.
PaulRoberts
PaulRoberts's profile picture
Colorado

Posts: 1776
PaulRoberts on Jun 23, 2012June 23rd, 2012, 5:24 am EDT
E varia on top. And a male Baetid below.
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Jun 23, 2012June 23rd, 2012, 9:44 am EDT
E varia on top. And a male Baetid below.

I agree. The eyes look to be turbinate on the latter, which would preclude the ephemerellids. As to the former, definitely Ephemera. As to species, I'd be interested in Gonzo's take as there are several similar ones in that region.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Jun 23, 2012June 23rd, 2012, 11:06 am EDT
As to the former, definitely Ephemera. As to species, I'd be interested in Gonzo's take as there are several similar ones in that region.

Looks like E. varia to me.

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