We describe and illustrate a new species of pselaphine beetles, Paramaurops zagoricus sp. n., from the Zagori region of Epirus, Greece. A list summarising the distribution of Amauropini known from Greece is also provided.

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We report the publication of 953 DNA barcodes of forest leaf litter beetles from central Taiwan, in total representing 334 species of 36 beetle families. This is the first bulk of data from the Taiwanese Leaf Litter beetles project focused on uncovering the under-explored diversity of leaf litter beetles across Taiwan. Based on these data, we provide the first records of the following taxa for Taiwan: family Sphindidae (genusAspidiphorusZiegler, 1821); tribes Trichonychini, Ctenistini, and Bythinoplectini (all Staphylinidae: Pselaphinae); generaGyrelonHinton, 1942,ThyroderusSharp, 1885,CautomusSharp, 1885 (all Cerylonidae),DermatohomoeusHlisnikovský, 1963 (Leiodidae),ParaploderusHerman, 1970 (Staphylinidae: Oxytelinae),ThinocharisKraatz, 1859 (Staphylinidae: Paederinae),CephennodesReitter, 1884,NapoconnusFranz, 1957 (both Staphylinidae: Scydmaeninae),BicavaBelon, 1884 (Latridiidae),OtibazoMorimoto, 1961,SeleucaPascoe, 1871 andAcallinusMorimoto, 1962 (all Curculionidae); species Oodes (Lachnocrepis) japonicus (Bates, 1873) (Carabidae: Licininae),Drusilla obliqua(Bernhauer, 1916) (Staphylinidae: Aleocharinae) andCoccotrypes advenaBlandford, 1894 (Curculionidae: Scolytinae). The records ofAnapleusHorn, 1873 (Histeridae) andBatraxisReitter, 1882 (Staphylinidae: Pselaphinae) have been confirmed. The male ofSivacrypticus taiwanicusKaszab, 1964 (Archeocrypticidae) is described for the first time.Gyrelon jenpaniHu, Fikáček & Matsumoto,sp. nov.(Cerylonidae) is described, illustrated, and compared with related species. DNA barcodes associated larvae of 42 species with adults, we are concisely illustrating some of these:Oodes japonicus, Perigona cf. nigriceps Dejean, 1831 (both Carabidae),Ptilodactylasp. (Ptilodactylidae),Maltypus ryukyuanusWittmer, 1970 (Cantharidae),Drusilla obliqua,Myrmecocephalus brevisulcus(Pace, 2008),Diochussp.,Mimopinophilussp. (all Staphylinidae),Stelidota multiguttataReitter, 1877,Lasiodites inaequalis(Grouvelle, 1914) (both Nitidulidae),Lagria scutellarisPic, 1910, andAnaedus spinicornisKaszab, 1973 (both Tenebrionidae). We also report the first cases ofRickettsiainfections in Scydmaeninae and Pselaphinae. All data (sequences, metadata, and voucher photos) are made public in BOLD database and in a Zenodo Archive.

New data on the genus Bryaxis Kugelann, 1974 from Croatia are presented. Two new species, Bryaxis bedeki sp. nov. and Bryaxis biokovensis sp. nov. are described and illustrated. Bryaxis issensis (J. Müller, 1909) is redescribed based on six males collected at the type locality, in the cave Špilja kod Vlore on the island of Vis, and the aedeagus of this species is figured for the first time. New distributional data of Bryaxis scapularis (Reitter, 1881), Bryaxis crepsensis crepsensis (J. Müller, 1947), Bryaxis stolzi (Machulka, 1932), and Bryaxis erichsonii erichsonii (Kiesenwetter, 1849) are also provided.

Seven new species of the cavernicolous and anophthalmous genus Thaumastocephalus Poggi, Nonveiller, Colla, Pavićević & T. Rađa, 2001 are described: T. bilandzijae sp. n., T. kirini sp. n., T. marsici sp. n., T. rujnicensis sp. n., T. slavkoi sp. n. and T. troglavi sp. n. from Croatia and T. dahnae sp. n. from Bosnia and Herzegovina. Aedeagi of all species are illustrated. A key to all species is provided. The records of all specimens of the genus treated here are given, and their distributions are discussed and shown on maps. The distribution of all genera of cavernicolous Pselaphinae in the Dinarides is discussed.

The monospecific clavigerite genus Archiclaviger Heller, 1936 (Coleoptera: Staphylinidae: Pselaphinae), previously only known from Java, is reported to occur in China. A new species, A. gaofani sp. nov., was collected in nests of Nylanderia Emery, 1906 ants (Hymenoptera: Formicidae) in Jiangsu Province, and is described here. The new species can be separated from A. overbecki Heller, 1936 by different proportions of the antennomeres, and much sparser setae at the apex of the elytra and base of the abdomen. A revised diagnosis of Archiclaviger is provided, and a lectotype is designated for A. overbecki.