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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 Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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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Troutnut.com User BrettB (Brett Billings)

Troutnut.com User BrettB (Brett Billings)

Real Name
Brett Billings
Location
Martinsburg, West Virginia
Biography & Thoughts
Originally from western Kentucky, started tying flies at age 11 in the middle of bass and catfish country. Was considered a bit odd. Eventually studied salmon flies under Ken Sylvia in Fairbanks, AK...Kim Rassmussen of Denmark and a few others. Worked for Kentucky Fish and Wildlife 1993-2004 as producer of TV show Kentucky Afield. Did master's of biology research on "An Aquatic Insect Bioassessment of the Cumberland River Tailwater in Southcentral Kentucky," completed in 2004 (Eastern Kentucky University). Working on Cumberland Tailwater fishing guide in spare time. Currently employed with US Fish and Wildlife in Shepherdstown, West Virginia doing National Wildlife Refuge Visitor Center Videos. Enjoy fishing the Potomac for smallmouth, trips to Alaska for salmon and Halibut with my wife, Shelly.
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Brett Billings
long-time tyer and amateur entomologist

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