Abstract
Hydroporus novacula sp. n. is described on a single male accidentally found when collecting Staphylinidae (Coleoptera) in south-western Georgia (Caucasus) by sifting more or less dry material quite far from any water. The species belongs to the longulus-group of the genus (former subgenus Sternoporus). However, the shape of the median lobe, the club-like pro- and mesotibiae and the evenly curved protarsal claws separate it from all other species of the group. Additionally, no natatory setae could be detected on any leg of the single male studied. Together with the collecting circumstances, it appears not unlikely that the new species is the first terrestrial Hydroporus known to science. The species is described in detail and important features are illustrated.
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