We present an annotated catalogue for the tribe Incini (Coleoptera: Scarabaeidae: Cetoniinae) including references to all taxonomic and nomenclatural acts, clarifying the spelling of names, providing type depositories and occurrence records for the species. The spelling of Golinca davisii (Waterhouse, 1877) is fixed, and the incorrect subsequent spelling Pantodinus klugi Burmeister, 1847 is preserved. A comprehensive list of all valid names in Incini is provided. Furthermore, we describe the third species in the genus Archedinus Moron & Krikken, 1990, and first one known from outside of Mexico, A. antoshkai Seidel & Arriaga-Varela sp. nov. from Cerro las Minas, the highest mountain in Honduras. We provide an updated determination key for the species of Archedinus. The new species is compared with Archedinus howdeni Moron & Vaz-de-Mello, 2007, the most similar species in terms of genital and habitus morphology. An updated key to identification of males of Archedinus is provided.

A new genus and species of the family Endomychidae (Coleoptera: Coccinelloidea): Cretostenotarsus striatus Tomaszewska, Szawaryn and Arriaga-Varela gen. et sp. nov. are described, diagnosed and illustrated from the mid-Cretaceous amber from northern Myanmar. To test the systematic placement of the new extinct genus and species within the family, a phylogenetic analysis was conducted. A dataset of 38 morphological characters scored for 29 species (including the new fossil taxon), members of Endomychidae sensu stricto and representatives of Coccinelloidea as outgroups were analyzed using maximum parsimony. The results of the analysis indicate unequivocally that Cretostenotarsus striatus is a member of the Stenotarsus clade within a monophyletic ‘endomychine complex’ sensu Robertson et al. (2015), which corresponds to ‘Higher Endomychidae’ sensu Tomaszewska (2005). The present discovery confirms at least the Jurassic origin of Coccinelloidea and indicates a much older origin of Endomychidae than previously hypothesized.

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.

The representatives of the genusCercyonLeach occurring in the Greater Antilles are reviewed. Ten species are recorded, of which five are described here as new:C. gimmelisp. n.(Dominican Republic),C. armatipenissp. n.(Dominican Republic),C. tainosp. n.(Dominican Republic),C. sklodowskaesp. n.(Jamaica) andC. spiniventrissp. n.(Dominican Republic). Diagnoses and detailed distributional data are also provided forC. floridanusHorn, 1890 (distributed in southeastern United States of America and Cayman Islands),C. insularisChevrolat, 1863 (endemic to the Antilles)C. praetextatus(Say, 1825) (widely distributed in the New World incl. Greater Antilles),C. quisquilius(Linnaeus, 1761) (an adventive species of Paleartic origin) andC. nigriceps(Marshall, 1802) (an adventive species probably of Oriental origin).Cercyon armatipenis, C. gimmeli, C. tainoform a group of closely related species only distinguishable by male genitalia and DNA sequences. A key to the Great AntilleanCercyonis provided and important diagnostic characters are illustrated. The larvae ofC. insularisandC. tainowere associated with adults using COI barcode sequences, illustrated and diagnosed. Full occurrence data, additional images and COI barcode sequences were submitted to open access on-line depositories in an effort to provide access to complete data.

Water scavenger beetles (Coleoptera: Hydrophilidae) are a broadly distributed group with high extant diversity. However, reliable records from Baltic amber (Eocene) are scarce and limited to two undescribed species previously reported in the literature. Here we study these two specimens plus four additional ones. All specimens were sub-optimal in terms of preservation and visibility of their morphology using traditional light microscopy. Opaque bubbles, cracks in the amber pieces and contracted appendages obscured most of the crucial characters, preventing their formal description and making them prone to misidentification. Here we used X-ray micro-computed tomography (μCT) to reconstruct the morphology of the embedded specimens and described three new species: Anacaena morla sp. nov., Crenitis profechuyi sp. nov. and Helochares fog sp. nov. Micro-CT reconstructions allowed us to visualise the morphology of the specimens to an extent where it was possible to hypothesise possible phylogenetic relations of the new taxa as well as the biogeographic implications of these relationships.

The state of knowledge of Mexican Endomychidae is summarized. A checklist for all described species recorded from México is presented, including comments on taxonomy, biology and distribution. 56 species are recorded (including two subspecies); Stenotarsus marginalis Arrow is recorded for the first time from México. These species belong to 18 genera; Lycoperdinella Champion is recorded based on an undescribed species. 7 subfamilies are present in the Mexican fauna: Anamorphinae, Merophysiinae, Lycoperdininae, Stenotarsinae, Epipocinae, Eupsilobiinae and Pleganophorinae. Epipocus is the most diverse genus with 20 species, followed by Stenotarsus with 13. The highest diversity is known from Veracruz, where 30 (32?) species are known, followed by Chiapas with 12 (13?) species.