The genus Phaedis of Sumatra is revised. Thirteen known species are recognised from the island and adjacent islands, in which eleven known species are redescribed or noted with additional description; eighteen new species are described under the following names, and a key to the species of Sumatra is given: P. coeruleovirenssp. nov., P. convexussp. nov., P. eleganssp. nov., P. kanieisp. nov., P. kraatzisp. nov., P. merklisp. nov., P. nanussp. nov., P. notaticollissp. nov., P. notatipennissp. nov., P. obscuripennissp. nov., P. obtusidenssp. nov., P. pubigasterussp. nov., P. purpureostriatussp. nov., P. rubripessp. nov., P. schultheissisp. nov., P. signatussp. nov., P. kaszabisp. nov., and P. yokoiisp. nov. A new species group, Shibatai species group, is proposed.

The flightless Cnodalonini genus MitysChampion, 1885 is revised. Lectotypes are designated for Mitys laevisChampion, 1885 and Mitys inflatusChampion, 1885, and the holotype of Mitys opacusChampion, 1885 is imaged. Mitys opacusChampion, 1885 is synonymized with Mitys politus (Brême, 1842). Three additional species are described herein: M. durangoensissp. nov., M. rileyi, sp. nov., and M. sprouseisp. nov. The genus is currently known only from Mexico, and appears to occur primarily in montane habitats based on existing locality records. Generic affinities between Mitys and other Neotropical Cnodalonini genera are discussed, particularly the relationship between Mitys and OxidatesChampion, 1886. A key to the known Mitys species and distribution maps are provided.

Seven new species of Lagriini are described from the Kingdom of Bhutan (hereafter Bhutan) and other parts of the Himalayas: Bothynogria simillimasp. nov. (Bhutan, India, Nepal), Donaciolagria densicornissp. nov. (Bhutan), Lagria (Ammocera) bhutanicolasp. nov. (Bhutan), Lagria (Ammocera) spinulicornissp. nov. (Bhutan), Lagria (Lagria) wanduensissp. nov. (Bhutan), Sora barapanicasp. nov. (Bhutan, India), Sora marmoreipennissp. nov. (Bhutan, India, Nepal, Vietnam). New locality records of further seven species of Lagriini collected in Bhutan are presented, with Casnonidea nigripennisFairmaire, 1894 and Cerogria quadrimaculata (Hope, 1831) representing new country records. Further new country, Chinese province and Indian state records: Casnonidea nigripennis: India (Sikkim, West Bengal), Nepal; Cerogria basalis (Hope, 1831): Myanmar, Thailand, Laos; Cerogria nepalensis (Hope, 1831): India (Himachal Pradesh, Meghalaya); Cerogria quadrimaculata (Hope, 1831): China (Zhejiang), Laos, Myanmar. A lectotype of Lagria (Ammocera) unicolorBorchmann, 1942 is designated.

The Peruvian genera of Edrotini (Pimeliinae) are revised. A new genus Pachacamacius Flores & Giraldo gen. nov. with two new species, Pachacamacius aguilari Giraldo & Flores sp. nov. (type species) and Pachacamacius koepckeae Flores & Giraldo sp. nov., is described. Two species originally described in the genus ProhylithusKaszab, 1964 are reassigned to two new monotypic genera: Sechuranus Flores and Giraldo gen. nov. (type species Prohylithus barbatusKaszab, 1964) and Koneus Giraldo and Flores, gen. nov. (type species Prohylithus peruanusKaszab, 1981). This article includes diagnoses for five genera and redescriptions or descriptions, distributional data, habitat records and habitus photographs for six species. A dichotomous key for all 11 Peruvian species of Edrotini, drawings of new species' male genitalic features, and distribution maps are also provided. A discussion of the external morphological characters and male genitalia of the new taxa compared to the genera and species previously described and on endemicity and zoogeography of Peruvian Edrotini is presented.

Discopleurus bondezanisp. nov. is described from a small cave within the Cerrado biogeographic province, in the state of Minas Gerais, Southeast Brazil. The new species is unique among Discopleurus in having the abdominal ventrite 2 as long as ventrite 5. Habitus photographs of the new species and a comparison of morphological characteristics with other closely related species are provided. This is the first record of a species of Stenosini from Brazil.

Specimens of Gyriosomus (Tenebrionidae, Nycteliini) are conspicuous darkling beetles of the Chilean Atacama desert. Most species of this genus have restricted ranges and emerge as adults only after extensive rainfall. During the last blooming of the desert in 2017, we collected several specimens in the Monumento Natural Paposo Norte (Antofagasta region), which showed morphological differences, such as elytral pilosity pattern and shape of the pronotum, when compared with the sympatric Gyriosomus angustus and G. curtisi as well as other morphologically similar species (G. chango and G. barriai). We analyzed external morphology, female and male external genitalia, and the COI sequences of these specimens and compared these data with those of other species in that subregion. The results support the description of a new species, Gyriosomus camanchacasp. nov., which is more closely related to G. chango than to the sympatric species of the Monumento Natural Paposo Norte. The evolutionary history of Gyriosomus in the Paposo region and its importance for conservation are discussed.

The genus Diastoleus Solier (Tenebrioninae: Scotobiini) is composed of four species restricted to north-central Chile. Representatives of this genus are adapted to inhabit xeric environments. In this paper the genus is revised using external features, new genitalic characters, and internal morphology. A new species, D. costalenissp. nov., is described from Paposo, Antofagasta, northwestern Chile. Habitat records, distribution map, habitus photographs, drawings of metendosternites and aedeagi are included. A cladistic analysis was conducted to test the monophyly of the genus within the tribe Scotobiini.

Based on a newly available material Cryphaeus camerunusArdoin, 1958 is redescribed. For the first time the male morphology of this species is presented. New distributional records are provided (Cameroon, Guinea and Central African Republic) as well as a checklist of the African species of the genus CryphaeusKlug, 1833.

This study describes the larva and pupa of the monotypic darkling beetle Idiobates castaneus (Knoch) (Coleoptera: Tenebrionidae) in the tribe Tenebrionini, from eastern North America. The species inhabits forested regions where adults and associated larvae have been discovered under dry loose bark of dead standing trees where cavities or pockets of frass have formed, apparently following infestations of other insects and rodents. Identity is confirmed by rearing of adults and pupae and preservation of associated exuvia. Distinctive characters of the larval abdominal apex and the armature of pupal ‘gin-traps’ are illustrated. A key to the larvae of North American genera currently placed in Tenebrionini is included.

A new tenebrionid genus Socotraphanesgen. nov. and two new species S. kralisp. nov. and S. dementorsp. nov. (Tenebrionidae: Helopini) are described from Socotra Island (Yemen). The genus differs from all Old World Helopini by hidden frontoclypeo-labral membrane, which originates under the inner side (not from the anterior edge) of frontoclypeus. The same character is known only within xeromorphic species of American Helops Fabricius, 1775 and NeohelopsDajoz, 2001. Socotraphanesgen. nov. belongs to the subtribe Helopina based on the structure of male genitalia and can be compared with the genus Neohelops (USA, Texas), with which it shares hidden frontoclypeo-labral membrane, not expressed vertical edge at elytral base and very short metaventrite, but it differs from Neohelops by the absence of large teeth on mesocoxae and absence of deep strial fovea. Both species of the new genus have ‘helopioid’ structure of female genital tubes with multiply branched spermatheca, weakly sclerotized apical part of vagina and unusual short accessory gland, which flows to the apical part of vagina through the short and wide one-way valve.

A new Enanea species (E. shuneiisp. nov.) and a new species belonging to a new genus (Taiwanomenimus nakasatoigen. & sp. nov.) of the subtribe Gnathidiina (Tenebrionidae) are described from Taiwan. A key to the genera of Palaearctic Asian Gnathidiina is provided.

A new darkling beetle species, Corticeus turcicus F. Soldati, sp. nov., is described from six localities in Turkey. The only related species in Europe and the whole Mediterranean basin seems to be C. unicolor Piller & Mitterpacher, 1783 from which it differs by the smaller body size, yellowish coloration, different with ratio between pronotum and elytra and aedeagal morphology. An updated identification key to the currently known Corticeus species of Turkey is proposed and all species are illustrated. The types of Corticeus fusciventris Reitter, 1884 and C. rufobasalis (Pic, 1917) were studied and a new synonymy is established: C. fasciatus (Fabricius, 1790) = C. rufobasalis (Pic, 1917), syn. nov.

Relationships of darkling beetles in the subfamily Phrenapatinae (Coleoptera: Tenebrionidae) are poorly known. Meaningful comparative studies are hampered by the fact that morphological structures of adults typically used for assessing relationships within Tenebrionidae cannot be used successfully in this group because they are either absent or extremely reduced. The pupal stage of twelve species in eight genera of Phrenapatinae is presented here. A description (or redescription) is given for each species. An identification key to the known Phrenapatinae pupae of the world is included. The usefulness of pupal characters to test generic and tribal limits within the subfamily is assessed. Preliminary results based on an assessment of pupal structures indicate that the current tribal classification needs to be reassessed.

New data on the little-studied darkling beetle subfamily Phrenapatinae is given for the Afrotropical Region. The following new taxa are described and included into a key to the Phrenapatinae species of southern Africa: Archaeoglenes ruthmuelleraesp. nov. from the Republic of South Africa and the Republic of Mozambique, Endroeditagalusgen. nov.ongoyussp. nov. from the Republic of South Africa and Endroeditagalusgen. nov.ntsubanussp. nov. from the Republic of South Africa. New distributional data is incorporated into a checklist of the Afrotropical Phrenapatinae fauna.