Apparently, the genus Ameroseius is the most decent amongst 12 genera distinguished lately by Mašán (2017) in his revision of the family Ameroseiidae. In Europe solely the family covers 13 species with descriptions of all females but not males. This paper adds the first description and figures of Ameroseius georgei male along with the key to males of European species within the genus.

New species of CrateronemaSiddiqi, 1969 and ChrysonemaThorne, 1929 are described and illustrated from the tropical rain forest soils in India. Crateronema tropicumsp. nov. is characterized by its long body (0.65–0.85 mm); cuticle with distinct transverse striations; lateral chords about one-third of the corresponding body diameter; lip region offset by constriction; pharyngeal expansion 42–53% of total neck length; vulva post-equatorial pore-like; tail elongate conoid, ventrally curved. Chrysonema minorsp. nov. is characterized by long body (0.67–0.85 mm); cuticle with fine transverse striations; lateral chords about one-third to two-fifths of the corresponding body diameter; lips amalgamated, lip region slightly offset by constriction; odontostyle about 0.6–1.0 times lip region diameter long; pharyngeal expansion 41–53% of total neck length; vulva equatorial pore-like; tail elongate conoid, ventrally curved. Males with 14–15 µm long dorylaimoid arcuate spicules, lateral guiding pieces and three ventromedian supplements. Crateronema aestivumSiddiqi, 1969 is redescribed and the photomicrographs are provided for this species for the first time. Diagnostic compendium and keys to valid species of Crateronema and Chrysonema is provided.

An overview of previously described fossil nitidulids is given with details on deposits with confirmed nitidulid representation. Notes on estimated ages and potential placement of fossils described to the species level is also given. A new genus and species of cillaeine sap beetle, Palaeopeplus cascus Powell & Cline is described from Dominican amber. A diagnosis and images are provided to distinguish this genus from all other New World Cillaeinae.

This catalogue includes all valid genus and species-group names of Hypophlaeini (Coleoptera: Tenebrionidae), their available synonyms, and misspellings. Type depository, distribution, and basic morphological data are given for every treated species-group name. The introductory part of this publication contains a summary of the current knowledge on larval and adult morphology within the tribe. The following new synonymies are proposed: Cheilopoma castaneumMurray, 1867 =Cheilopoma kraatziGrouvelle, 1914syn. nov.; Corticeus maehleri (Kulzer, 1957) =Hypophloeus mayumiaeMasumoto, 1983syn. nov. The lectotypes of Hypophloeus rufipesFabricius, 1801 and Hypophloeus constrictusGebien, 1921 are designated. Corticeus africanus uhligiBremer, 1995 is recognized as an independent species: Corticeus uhligiBremer, 1995stat. nov. Subgeneric classification of Corticeus is adjusted. According to the results Hypophlaeini is composed of 261 species classified in the following six genera: CheilopomaMurray, 1867 (monotypic), CorticeusPiller & Mitterpacher, 1783 (255 species and subspecies), IschnarthronGebien, 1921 (monotypic), Myonophloeus Bremer & Lillig, 2017 (monotypic), PogonoxenusWasmann, 1899 (monotypic), and TyphlophloeusJeannel & Paulian, 1945 (two species).

The species of Trictenotoma Grey, 1832 from the Philippine Archipelago are critically assessed, description of T. boudanti Drumont et Telnov sp. nov. from Balabac and Palawan, and a redescription of T. cindarellaKriesche, 1921 from Mindanao are provided. A key to the Philippine Trictenotomidae Blanchard, 1845 is presented for the first time.

An account of the Anthicidae (ant-like flower beetles) and associated incertae sedis groups of Chile is presented. Forty seven species and subspecies are confirmed for the country (Anthicinae, Copobaeninae, Eurygeniinae, Lagrioidinae, Lemodinae, Tomoderinae), including 11 new to science: Ischyropalpus aberratus, I. quadrimaculatus, I. similis, Sapintus costae, Tomoderus cavithorax, T. differens, T. melanocephalus, T. nahuelbuta, Trichananca inexpectata, T. neotropica, T. poggiispp. nov.ProtoanthicusMoore et Vidal, 2005 is found to be congeneric with Trichananca Blackburn, 1891, a new synonym and three new combinations are proposed: Trichananca marziae (Moore et Vidal, 2005) comb. nov., T. poqui (Guerrero et Diéguez, 2018) comb. nov., T. valenciai (Moore et Vidal, 2005) comb. nov. (all from Protoanthicus). Lectotypes are designated for Ischyropalpus maculosus (Fairmaire et Germain, 1860) and I. testaceoguttatus testaceoguttatus (Fairmaire et Germain, 1863). Hirticomus quadriguttatus (Rossi, 1792) appears to have been recently introduced to New World by human activity. Heterolobus R. A. Philippi in Philippi et Philippi, 1864, which has been originally described as Anthicidae, is moved to Salpinginae (Salpingidae). As a result of the present study, the confirmed endemism rate in Chilean Anthicidae sensu lato is about 82%.

Fireflies (Coleoptera: Lampyridae) spend most of their lives as larvae. Nevertheless, immature stages of over 99% of species remain unknown, which gives an incomplete picture of the species' biology. Moreover, fireflies are most diverse in Central and South America, where most species remain known from the centuries-old taxonomic descriptions based on male morphology. Here, we redescribe the spotted tortoise firefly, Aspisoma stictucum Gemminger, 1870 based on immature and adult stages, provide illustration of diagnostic features and an updated distribution map. A definitive diagnosis of adult A. sticticum among congeneric species remains elusive due to lack of comparative studies, but the following combination of traits allow for discrimination of co-occurring species: size large (2–4 cm); pronotum and elytron testaceous with variable developed black spots, pronotum subtriangular; elytron widest at basal third. A. sticticum larvae is unique among fireflies in having paired pronotal lantern spots, in addition to the typical abdominal lantern spots. In fact, these sets of larval lanterns have independent control, as observed in the field and in the lab. Noteworthy, the pronotal lanterns cannot be seen in dead specimens, which stresses the need for field studies towards a deeper and more comprehensive understanding of fireflies.

This paper is the second in a series of studies on the genus Habroloma Thomson (1864) from China. The present paper introduces some additional diagnostic characters with important significance. Nine species from China are newly described and illustrated: Habroloma contractumsp nov., H. zongyangensissp nov., H. songisp nov., H. pulchrumsp nov., H. caudiacrumsp nov., H. grotesqumsp nov., H. purpuratussp nov., H. quadratiformissp nov., and Habroloma longipennissp nov.

A new genus (Saeculumgen. nov.) of South African endemic Asidini is described to accommodate two newly described species (Saeculum zoologicumsp. nov. – type species, and Saeculum merklisp. nov.) and Saeculum tuberosum (Wilke, 1925) comb. nov. (previously treated as incertae sedis within Asidini). A key to the species is provided.

A new monotypic genus of ricaniid planthoppers (Hemiptera: Fulgoromorpha: Ricaniidae) from Namibia, Sensoricagen. nov., is described for S. namibiensissp. nov. (type species). Habitus, female, external and internal genital structures of the new species are described and illustrated.