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.
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.
I spent a couple hours in the evening fishing the Yakima upstream of the Cle Elum river, where flows were around 265 CFS at the Easton gage. These were pretty good conditions for wading a stretch that looked promising, but there was no sign of decent fish. Most were just salmon parr hitting midges on the surface, and I caught a single small cutthroat.