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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With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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Closeup insects by Bnewell from Crazy Beaver Spring in Montana
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