Four new species of Leuctra Stephens, 1836 from the Balkans (Plecoptera, Leuctridae)

Four, presumably microendemic new <i>Leuctra</i> species are described on the basis of morphology of the adult males and females. Each species was collected only in a single mountain range of the western Balkans: <i>Leuctraenigma</i> Kovács & Murányi, <b>sp. nov.</b> (Albania, Çermenikë), <i>L.golija</i> <b>sp. nov.</b> (Serbia, Golija), <i>L.puskasi</i> <b>sp. nov.</b> (Bosnia & Herzegovina, Kozara), <i>L.visitor</i> <b>sp. nov.</b> (Montenegro, Visitor). Their morphological affinities and ecology are discussed, phylogenetic relations will be described in the framework of ongoing molecular studies of Balkan <i>Leuctra</i> species. The occurrences of the new species are depicted on a map. A list of Balkan endemic <i>Leuctra</i> species is given. <i>Leuctradalmoni</i> Vinçon & Murányi, 2007 is new for Albania and Montenegro, <i>Nemourauncinata</i> Despax, 1934, <i>N.marginata</i> Pictet, 1836 and <i>Isoperlaburesi</i> Raušer, 1962 are new for Albania, <i>Nemourasciurus</i> Aubert, 1949 is new for Bosnia & Herzegovina, while Capnias. l.viduarilensis Raušer, 1962 and <i>L.metsovonica</i> Aubert, 1956 are new for Montenegro.