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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.

Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington
This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
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.

Siphlonurus autumnalis (Gray Drake) Mayfly Nymph Pictures

This mayfly was collected from Crazy Beaver Spring in Montana on August 31st, 2007 and added to Troutnut.com by Bnewell on June 28th, 2011.

Discussions of this Nymph

Mix-up
2 replies
Posted by GONZO on Jul 2, 2011
Last reply on Jul 2, 2011 by Troutnut
I've really been enjoying looking at Dr. Newell's additions to the "Aquatic Insect Encyclopedia," but there seems to have been some sort of mix-up here. The 2nd photograph is an female ephemerellid dun, possibly something like Ephemerella tibialis.

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Siphlonurus autumnalis (Gray Drake) Mayfly Nymph Pictures

Collection details
Location: Crazy Beaver Spring, Montana
Date: August 31st, 2007
Added to site: June 28th, 2011
Author: Bnewell
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