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.
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This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
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PaulRoberts on Aug 23, 2010August 23rd, 2010, 4:33 am EDT
Wow, I don't remember them being so small! I believe I tied mine on a #18. They have long wings and look bigger on the wing I believe. On E Branch Owego they were in fishable numbers.