New and little-known pseudoscorpions of the genus Roncus L. Koch (Neobisiidae, Pseudoscorpiones) from Serbia, Yugoslavia

Two new species of Roncus L. Koch, 1873 (R. svarozici n. sp. and R. svanteviti n. sp.), collected in eastern and southeastern Serbia, Yugoslavia, are described and their distribution is given. A supplementary description of R. pljakici Ćurčić, 1973, is provided as well. The taxonomic diversity of the western and southern European “Roncus lubricus” species complex is discussed in view of the importance of some diagnostic characters. The possible role of R. svarozici n. sp. and R. parablothroides Hadži, 1937 in colonizing caves is considered as well as the divergent differentiation of some Balkan subterranean pseudoscorpions.