A remarkable new species of Rhagio Fabricius, 1775 from the Iberian Peninsula (Diptera: Rhagionidae)

A new species of Rhagio Fabricius, 1775 is described from the Iberian Peninsula. It has been found at higher altitudes in the mountains of Spain and Portugal. The wing venation of the new species is remarkably variable. The new species is compared with other similar species. Rhagio niger (Wiedemann, 1820) and Rhagio funebris (Meigen, 1820) are redescribed. A lectotype is designated for Rh. niger. A key for all European species of Rhagio with darkened wings and abdomen is provided.