Key to Rhithrogena spp. Couplet 23. Wings more or less suffused with pale golden-brown in basal half; outer apical angles of penis-lobes acute (fig 41). Wing expanse 18-24 mm.
4. Wings indistinctly shaded with brownish at base; outer apical angles of penis-lobes rounded (fig 42). Wing expanse 29-38 mm.
