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 specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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Backswimmer Genus Notonecta
No information for Notonecta is online yet, so it's not included in the main link structure of the site.Backswimmer Genus Notonecta
Taxonomy
17 species (Notonecta borealis, Notonecta hoffmani, Notonecta indica, Notonecta insulata, Notonecta irrorata, Notonecta kirbyi, Notonecta lobata, Notonecta lunata, Notonecta montezuma, Notonecta petrunkevitchi, Notonecta raleighi, Notonecta repanda, Notonecta shooterii, Notonecta spinosa, Notonecta uhleri, Notonecta undulata, and Notonecta unifasciata) aren't included.