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Mayfly 2 - Ephemerella dorothea

Mayfly 2 - Ephemerella dorothea
Leslie Groves Park, Benton County, Washington, USA
June 28, 2014
I think this is a Mayfly. It looks somewhat immature, so maybe it is a subimago. It has a three pronged tail rather than two which I think is more common. Any help is appreciated.

Moved from Mayflies.

Ephemerella dorothea infrequens
Hi Alex-

I believe this male imago to be Ephemerella dorothea infrequens. One can recognize it as being an imago based the transparent wings, and as being a male imago based on the greatly extended length of the fore legs as compared to the length of the middle and hind legs.

Thanks Roger
That information is very useful. Now at least I can distinguish between male and female.

Moved from ID Request.

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