Herniosina Rohacek: revised concept, two new species, new key and atlas of male and female terminalia (Diptera, Sphaeroceridae)

The taxonomic concept of Herniosina Rohacek, 1983 (Diptera: Sphaeroceridae) is revised on the basis of five W. Palaearctic species, thus excluding the E. Nearctic Herniosina volumincsa Marshall, 1987 whose inclusion caused the paraphyly of the genus. Two new species, H. erymantha sp. n. (male only, Greece: Peloponnese) and H. haorata sp. n. (both sexes, Cyprus), are described and illustrated, and the other three species, H. bequaerti (Villeneuve, 1917), H. horrida (Rohacek, 1978) and H. pollex Rohacek, 1993, are diagnosed With an atlas of their male and female terminalia. The relationships of the redefined genus and of all its species are discussed, and their biology and distribution are reviewed. A new illustrated key to Herniosina species is given.