Subgenus Caverneleodes of the genus Eleodes is diagnosed and revised. Six new species from the United States: California (E. microps); Utah and Northern Arizona (E. wynnei), Central Arizona (E. wheeleri), Southern New Mexico (E. guadalupensis), and Mexico (E. thomasi and E. grutus) are described. The biogeography of the subgenus is discussed. Diagnoses and a key are provided to known species of Caverneleodes. Relationships with other Eleodes are discussed. Cave associated Amphidorini are surveyed.

Mariepskopia albomaculata gen. et sp. nov. from South Africa is described. The genus is placed into the tenebrionid tribe Cnodalonini and has no closer relative in Africa, but probably in the Oriental Region with the genus Asbolodes. The species has a small distribution area in Mpumalanga and KwaZulu-Natal and has probably an arboreal mode of life in the montane forest in 1300–1600 m altitude.

A new species of the genus Probaticus Seidlitz, 1896, P. (Pelorinus) peslieri sp. nov., is described from some localities of the island of Lesvos, Eastern Aegean Greece. It is compared to all its Greek relatives.

The catalogue of all known species of the melanocratoid lineage of the subtribe Platynotina Koch, 1953 is presented. Eight genera containing 30 species are listed. The data of primary and secondary types is provided. Distribution of the species is listed and illustrated on 9 maps. New distributional data is published for: Melanocratus fairmairei Iwan, 1996, M. validipes Fairmaire, 1895, Sebastianus madagascariensis Iwan, 1999, S. magnus Iwan, 1996, S. ovoideus (Fairmaire, 1902), S. projectus Iwan, 1996, Styphacus girardi Iwan, 2004 and S. phreneticus Iwan, 1996. The relationship between species richness and Malagasy ecoregions is analysed and discussed. MaxEnt software was used to model the hypothetical range of chosen species and indicate the most important abiotic factors responsible for observed distribution. Results of MaxEnt analysis suggest that the precipitation has the major limiting impact from all of analysed factors.

A new bark-gnawing beetle genus Sinopeltis gen. nov., with two species (S. jurrasica sp. nov. (type species) and Sinopeltis amoena sp. nov.), is described based on two well-preserved impression fossils. Specimens were collected from the Middle Jurassic Jiulongshan Formation in Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China from a lacustrine paleoenvironment, making it the oldest fossil of the family. Sinopeltis is placed into Peltinae incertae sedis.

Anthrenus (Florilinus) nepalensis sp. nov. is described from Nepal. The habitus, antennae, scales, and galea with lacinia are illustrated and compared to related species. Key to Anthrenus species from Nepal and North India is presented. Revised checklist of Anthrenus species from Nepal and North India is also given.

The Himalayan species of the genus Selasia are reviewed. Selasia atriventris Pic, 1914 from Darjeeling is redescribed and two new species are described: Selasia boruckae sp. nov. from Nepal and Selasia merkli sp. nov. from Pakistan. Selasia maindroni Bourgeois, 1903 from India is transferred from Drilini to Lampyridae: Ototretinae incertae sedis. Diagnostic characters of all Himalayan Selasia species are illustrated and the identification key to males is provided.

A new species Picomicrolycus ireneae sp. nov. from Brazil is described and Calleros pilosus Pic, 1934 is transferred to Picomicrolycus, recording this genus for the first time from South America. Diagnostic characters are illustrated and a key to known Picomicrolycus species is given.

The Palaearctic genus Shadelphax Ding, 2006 (Hemiptera: Fulgoromorpha: Delphacidae: Delphacinae: Delphacini) is taxonomically reviewed to include two species: S. eforiae (Dlabola, 1961) (China: Neimenggu, Ningxia, Gansu, Qinghai and Xinjiang; Mongolia; Kazakhstan; Ukraine; Middle Asia) and S. kashiensis sp. nov. (China: Xinjiang). The genus Shadelphax is redefined. The main morphological characters including the male genitalia of the two species are described or redescribed and illustrated.

A first rearing record of the small-headed fly Ogcodes fumatus (Erichson, 1846) from the running crab spider Philodromus cespitum (Walckenaer, 1802) is reported. Aberrant web spinning activity of the host spider is documented. Molecular work comprises DNA barcoding (COI) for the host and parasitoid as well as PCR assays (16S rRNA, wsp) detecting the presence of at least two strains of Wolbachia bacteria in O. fumatus. A Neighbour-joining search of the 16S rRNA clusters these strains within supergroup A of Wolbachia.

The Spanish species of the genus Adelphenaldis Fischer is reviewed. The description of a new species, A. maxfischeri sp. nov., and redescriptions of the recorded for Spain for the first time A. globipes (Fischer 1962) (comb. nov.) and A. spiritalis (Tobias 1992) (comb. nov.) are proposed. Synaldis georgica Fischer 1993 is synonymised with S. globipes Fischer 1962 (syn. nov.). The following new combinations are suggested: Adelphenaldis acutidentata (Fischer), comb. nov., A. cultrata (Belokobylskij), comb. nov., A. moniliata (Belokobylskij), comb. nov., A. pacifica (Belokobylskij), comb. nov., A. paraclypealis (Fischer), comb. nov., A. parvicornis (Thomson), comb. nov., A. ryukyuensis (Belokobylskij), comb. nov., A. spasskensis (Belokobylskij), comb. nov. A key to the world species of the genus Adelphenaldis is given.

Two new species of New World halictine bees (Halictidae: Halictinae) are described and figured with extreme forms of female macrocephalism. Lasioglossum (Evylaeus) xitle sp. nov. (Halictini: Gastrohalictina) from Cráter del Xitle in Mexico City, Mexico and Augochlora (Oxystoglossella) empusa sp. nov. (Augochlorini: Augochlorina) from Madre de Dios, Peru are remarkable for not only their greatly enlarged heads and monstrously developed mandibles, but also for their pronotal modifications (both species), propodeal lamellae (A. empusa), and genal (L. xitle) and hypostomal (A. empusa) protrusions.

Misinterpreted artefacts and morphological variations are two possible sources of taxonomic synonymies. We have recognized these two in the case of the geophilomorph Schendyla furcidens Kaczmarek, 1962, described from Poland and subsequently reported from Germany, the Czech Republic and Slovakia. The species was described based on some differences in the structure of the labrum, maxilla, mandible and last legs as compared to Schendyla nemorensis (C. L. Koch, 1837). While studying Hungarian and Polish Schendyla specimens we found that the furcate shape of the labral teeth, putatively diagnostic for S. furcidens, was an artefact visible under light microscope caused by the forward-turned position of the labrum. Similarly, differential characters in mandibles and maxillae were found to be artefacts emerging during slide preparation, while characters of the legs can be considered as intraspecific variability. Thus, we can conclude that S. furcidens is a junior subjected synonym of S. nemorensis (syn. nov.). Line drawings and SEM micrographs are given to illustrate all the main taxonomic characters and their alterations.

Eutobrilus obesus sp. nov. and E. brzeskii sp. nov. are described and illustrated based on the material collected from Lake Baikal, Siberia, Russia.

Ektaphelenchoides sylvestris sp. nov. is described and illustrated. The new species was recovered from the galleries of bark beetles from a dead Pinus sylvestris L. tree and characterized by females with 644–843 µm long body, lip region 7.5–9.0 µm wide, separated from the rest body with a shallow constriction, stylet 18–23 µm long, excretory pore 72–85 µm far from anterior end, postuterine sac short, 5–11 µm long and male absence. By having a short postuterine sac, the new species comes close to four known species of genus namely E. attenuata, E. musae, E. pini and E. wintert.

A new species of the subgenus Pseudacrobeles is described from apple orchard in Tehran province (Iran). Pseudacrobeles (Pseudacrobeles) iranicus sp. nov. is characterized by its body length (0.47–0.56 mm in females and 0.45 mm in male) and lateral field that includes three incisures fading out anterior to the phasmid in females and reaching almost to the tail terminus in males. It is further characterized by the lip region with six separate lips, and by labial probolae that are present as low ridges connecting the tips of adjacent lips and continued towards oral opening in a hexaradiate disc-shape, but by the absence of cephalic probolae; the pharyngeal corpus is cylindrical and 2.2–3.4 times longer than the isthmus, the excretory pore at the level of the isthmus; the spermatheca is 20–39 µm long, the postuterine sac is 0.9–1.6 times the corresponding body diameter long; the female tail is conical-elongate (64–75 µm, c=7.3–8.0, c'=5.0–5.6), with phasmids at 36–38% of its length, and the male tail conical-elongate having long mucro (55 µm, c=8.3, c'=3.4). In addition, P. (P.) macrocystis is described for the first time from Iran. Descriptions, measurements and illustrations, including SEM photographs, are provided for the two species.

The morphology of juvenile stages and ontogeny of Heterozetes palustris (Willmann, 1917) and Zetomimus furcatus (Pearce & Warburton, 1906) are redescribed and illustrated. The juveniles of the former species have most prodorsal and gastronotal setae long, and smooth integument with microtuberculate cerotegument, while those of the latter species have most prodorsal and gastronotal setae short, with three pairs of longer and thicker setae in the posterior part of gastronotum, tuberculate integument, and two darker stripes, transverse and longitudinal, in the shape of letter T, with microtuberculate cerotegument. Most of nymphs of Z. furcatus bear one scalp, and rarely 2–3 scalps of previous instars that adhere to the gastronotum, which is observed here for the first time. The adults of both species have several morphological characters of Ceratozetoidea, while their juveniles lack a humeral organ and distinct sclerites, which occur in most Ceratozetoidea.

The diagnosis of Bionychiurus Pomorski, 1996 is updated and a identification key to the world species of the genus is given. A new species, B. changbaiensis sp. nov., as the first Chinese species of the genus, is described from Northeast China. The new species is diagnosed by pso formulae as 32/133/33343 dorsally and 11/000/01120 ventrally, psx present on subcoxa 1 of legs I, II and III as 1, 1 and 1 respectively, PAO composed with 22–26 granulated vesicles, Th. I with 9–10 9–10 chaetae dorsally, chaetae on subcoxa 1 of legs I–III as 5/6/6, unguiculus 0.8 times as long as inner edge of unguis and anal spines as long as inner edge of hind unguis.