ID based on it being a small mayfly-like thing. That's all I got.
Olive body, grey wings, 2 tails.
Dark reddish brown body, large eyes, grey wings, 3 tails. This male is slightly smaller, darker body than the females.
Fairly large (10 mm or so), 3 tails, reddish-yellow body, grey wings, 3 tails. Small eyes. Female.
I wonder if this is Epeorus pleuralis. Seems a bit dark, but I did see what appeared to be several E. pleuralis spinners in mating flight a few hundred yards away. 2 tails, greyish, somewhat opaque wings (dun, or sub imago), large eyes (male).
Not sure of the ID. About a size 12 or 14, brownish body, clear wings (imago, or spinner). 2 tails. Large eyes (male).
Mayflies or shadflies are insects belonging to the order Ephemeroptera (from the Greek εφήμερος, ephemeros = "short-lived" (literally "lasting a day" "daily" or "day-long"), and πτερόν, pteron = "wing", referring to the brief lifespan of adults). They have been placed into an ancient group of insects termed the Palaeoptera, which also contains dragonflies and damselflies. They are aquatic insects whose immature stage (called "naiad" or, colloquially, "nymph") usually lasts one year in fresh water. The adults...