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.

Upper Titcomb Lake

From Titcomb Basin in Wyoming

Stream photos

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Setvena wahkeena (Wahkeena Springfly) Stonefly Nymph Setvena wahkeena (Wahkeena Springfly) Stonefly Nymph

Dorsal view of a Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington

As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.

7 Recently Added Photos

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.

Lepidostoma?

Lepidostoma (Little Brown Sedge) Caddisfly Larva

6 Pictures

Case view of a Lepidostoma (Lepidostomatidae) (Little Brown Sedge) Caddisfly Larva from the Delaware River in New York

Collected May 12, 2007 from the Delaware River in New York

Added by Troutnut on May 18, 2007

Collected May 12, 2007 from the Delaware River in New York and added by Troutnut on May 18, 2007

PaulRoberts

Colorado

Posts: 1776

PaulRoberts on Aug 15, 2012August 15th, 2012, 6:08 pm EDT

I believe Lepidostoma has antennae fixed very close and right in front of the eye. I don't see that here. Maybe it's obscured in the image?

Entoman

Northern CA & ID

Posts: 2604

Entoman on Aug 15, 2012August 15th, 2012, 8:45 pm EDT

Yeah, I can't make them out either, but my eyes are pretty blurry this time of night... The antennae are very hard to make out at any time though, usually looking like a tiny pale dot next to the anterior margin of the eye. There's not much to 'em. In a good microscope photo in lateral view, they look like the plunger end of a very tiny retractable ball point pen to me. For me, the best (and easiest way) to identify them is by their having lateral humps on the first abdominal segment while lacking a dorsal hump. Others either have all three or lack them entirely and the cases are different.

"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

PaulRoberts

Colorado

Posts: 1776

PaulRoberts on Aug 16, 2012August 16th, 2012, 7:42 am EDT

I see. Found another web image and the antennae are indeed obscure.