Hex Mayflies
Hexagenia limbata
The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
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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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Definition of 'hind wing'
Definition of 'hind wing'
Hind wing: The rear pair of wings of an insect, which are attached to the metothorax, the same thoracic segment that bears the hind legs. In mayflies, the hind wings are much smaller than forewings, and in rare cases absent. In caddisflies, they are the inner wings, covered by the fore wings, when the wings lay at rest over the body. In stoneflies, they are the bottom wings, covered by the fore wings, when the wings are laid flat over the body. Midges and other true flies do not have true hind wings.
These other words reference the same concept: hind wings, hindwing, hindwings.
These other words reference the same concept: hind wings, hindwing, hindwings.