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 one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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Troutnut.com User JerryC
Troutnut.com User JerryC
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Philadelphia, PA
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I've been fly fishing and tying for over 20 years. I fish for whatever will take my flies.
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"All things considered, I'd rather be in Philadelphia."