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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Tricos
This common name refers to only one family. Click its scientific name to learn more.
Mayfly Family Leptohyphidae
These are often called Tricos.
Read about the Tricorythodes genus for details. It is very important to trout anglers and it's the only significant trout stream genus in this family.
Most of the other genera are found only in warm waters in Mexico and the Southwest.
Most of the other genera are found only in warm waters in Mexico and the Southwest.
This female Trico was collected with an associated male and many others.
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