Isidro on Mar 11, 2008March 11th, 2008, 10:50 pm EDT
In this case, I'm completely sure about the genus. In Iberian Peninsula are cited three Epeorus species: E. alpicola, E. sylvicola and E. torrentium. Which one can be this insect?
Flying in small groups above a road, in high mountain, Benasque, Aragon, Spain, in the Pyrenees mountains, at 1400 meters high, in a zone with quick river of clean and cool water, with rocks and stones. All surrounded by pine (Pinus sylvestris) forest. Wingspan: about 25-30 mm.