The winged stages ofRhithrogena diaphanaNavâs, 1917 are redescribed and drawn on the basis of fresh material collected not far from the type‐locality. The winged stages, the eggs and nymphs of three new species of thediaphana‐group are also described and illustrated:R. beskidensissp.n.,R. marcosisp.n. andR. savoiensissp.n. General remarks on the distribution and the biology are presented and the features distinguishing male adults and nymphs of these species from the other known species of thediaphana‐group are keyed.