Thailand has been extensively surveyed for aquatic insects in the last two decades. However, other than descriptions of adults, the family Psephenidae have gone unexamined. Previously, 13 genera and 26 species of adult psephenids were known from Thailand. In our survey for larval psephenids, we found all genera of Eubrianacinae previously known from Thailand plus Mubrianax Lee, Satô, and Yang, a new country record, and one undescribed larva. In Eubriinae, we found larvae of three of the five genera known from Thailand, plus Homoeogenus Waterhouse, a new country record. In Psepheninae, we collected larvae of Mataeopsephus Waterhouse, a new country record. In Psephenoidinae, we were able to identify only Sinopsephenoides Yang, although we have numerous records of unidentified larvae in the subfamily. New locality information is provided plus a key to the subfamilies and genera for all known psephenid larvae from Thailand.

Dryophthorinae includes some of the most economically important weevil pests. Feeding damage on host plant occurs primarily during the endophytic larval stages. The immature stages of only approximately 5% of dryophthorine genera are currently known. Traditional Ecological Knowledge of the Dawu People of the island of Lanyu led to the discovery of the immature stages and host plant of the dryophthorine weevil genus Poteriophorus Schoenherr. The larva, pupa, and biology of Poteriophorus uhlemanni (Schultze, 1922) are described for the first time. The newly discovered larva is compared to closely related taxa, including two of the most economically important and commonly encountered genera in Sphenophorina: Metamasius Horn, 1873 and Sphenophorus Schoenherr, 1838. Discovery of the associated larval and pupal stages of P. uhlemanni provides suites of characters for morphologically based phylogenetic studies, insights into the larva's functional morphology of feeding, tunneling, and cocoon-making behavior, and the ability to accurately identify the species at all stages.Knowledge of host preference will inform management strategies for poorly studied endemic species in the area.

AmphicrossusErichson, 1843 is a moderately large genus within the monogeneric subfamily Amphicrossinae. Two species of Amphicrossus have been recorded from Northeast India. The present study describes three new species from the region: Amphicrossus kabitae Dasgupta and Pal, Amphicrossus brunneus Dasgupta and Pal, and Amphicrossus adustipennis Dasgupta and Pal. The genus and all species known from Northeast India are (re)described.

Nomenclatural changes in Caryedes Hummel (Chrysomelidae: Bruchinae) are proposed within the context of a full taxonomic revision and phylogenetic study. Three new synonymies are proposed: Bruchus godmaniSharp, 1885 = Caryedes cristatus (Fåhaeus, 1839); Bruchus gounelleiPic, 1923 = Caryedes juno (Sharp, 1885); Bruchus diversipesPic, 1927=Caryedes longifrons (Sharp, 1885). Two synonymies are confirmed: Pseudopachymerus multinotatus paulonotatusPic, 1930 = Caryedes clitoriae (Gyllenhal, 1839); Pseudopachymerus cristatus velutinotatusPic, 1936 = Caryedes cristatus (Fåhaeus, 1839). Lectotypes for six species are designated: Bruchus cristatus Fåhraeus, 1839; Bruchus (Pachymeri) clitoriaeGyllenhal, 1839; Pseudopachymerus multinotatus paulonotatusPic, 1930; Pseudopachymerus cristatus velutinotatusPic, 1930; Pseudopachymerus (Falsobruchus) gounelleiPic, 1923; Bruchus diversipesPic 1927. Caryedes is now represented by 40 valid species.

The genera CorinthiscusFairmaire and Germain, 1861, Morulaptoma Opitz, new genus, and Petorca Opitz, new genus, are redescribed/described, and revised. The species composition of these genera involves: Corinthiscus insignicornisFairmaire and Germain, 1861, Morulaptoma canuta Opitz, new species, Morulaptoma nigra (Chevrolat, 1876), new combination, and Petorca denticolla (Spinola, 1849), new combination. Corinthiscus nigra (Chevrolat) is now the type species of Morulaptoma. Lectotypes are designated for Corinthiscus insignicornisFairmaire and Germain, 1861, Pelonium nigrumaChevrolat, 1876, and Clerus denticollisSpinola, 1849. Biogeographical evidence suggests that these checkered beetle genera evolved in significantly different forest communities, and morphological observations indicate that they are carnivorous. It is hypothesized that the ancestor of this monophyletic assemblage diversified in a region involving Chile and Argentina, with radiation into the forested biomes of southeastern Brazil.

Triariodes Clark and Anderson, new genus, is described, and Triarius vittipennis (Horn, 1893), new combination, is transferred to this genus. Triariodes admiratio Clark and Anderson, new species, Triariodes segonku Clark and Anderson, new species, and Triarius novoleonis Clark and Anderson, new species, are described from Mexico. Triarius texanus Clark and Anderson, new species, is described from Texas. All known species in Triariodes and Triarius are diagnosed, illustrated, and included in keys to species. Diabrotica neotropica Clark and Anderson is proposed as a replacement name for Triarius tropicusWeise, 1921.

Road mortality has a negative impact on numerous animals with conservation importance, including invertebrates. Some weevils are considered pest insects, thus there is little concern when they fall victim to road traffic. Nevertheless, information offered by road-killed weevils can be of conservation, biological, or zoogeographic value. To understand this information, during 2015 and 2016 we collected 186 road-killed weevils belonging to 23 species from secondary roads with low traffic in eight regions of Romania. As for other animal groups, weevil road mortality is influenced by the habitat surrounding the road and the time of year. The highest number of road-killed weevil species was recorded on roads surrounded by sandy areas. In areas surrounded by forests, the number of road-killed species was low, but the Shannon-Wiever diversity index was high, and some species were present only in these regions. The highest numbers of weevils were killed by cars in the spring. Some road-killed species are first records for the region they were identified in, others are rare in Romania. The mountain species Donus oxalis (Herbst, 1795) was encountered at just 80 m altitude in the Danube Gorge.

The solitary predatory wasp Cerceris fumipennis Say provisions its nests with beetles from the family Buprestidae. State and federal officials in New England, USA collected Buprestidae prey from C. fumipennis starting in 2009. At least 220 colonies of C. fumipennis were monitored as part of the cooperative survey. A total of 6,044 individual Buprestidae from 12 genera and 69 species were collected during surveys conducted during 2009–2011. In total, 56 new state records for 40 species are documented in New England through July 2018. Rarefaction analysis of data pooled by state suggested that more species potentially collected by C. fumipennis exist but were not sampled.

Xyleborine ambrosia beetles bore galleries into wood to cultivate symbiotic fungi for larval and adult food. This habit and their haplodiploid mating system have contributed to their diversification in forest habitats throughout the world. There are ∼1,200 species divided in 37 genera that have been recently revised in a phylogenetic framework. To continue to equate genera with monophyletic groups, we investigated the validity of Heteroborips Reitter, 1913, a genus first erected for the Palearctic species Xyleborus cryptographus (Ratzeburg, 1837). Based on a phylogeny inferred fromDNAsequence data, X. cryptographus and Xyleborus seriatus (Blandford, 1894) are monophyletic. These species are unrelated to Xyleborus Eichhoff, 1864 and belong to a larger clade of species of Coptodryas Hopkins, 1915, Cryptoxyleborus Schedl, 1937, and Microperus Wood, 1980. Xyleborus cryptographus and X. seriatus differ from these and other Xyleborini genera by excavating brood galleries under bark and by characteristics of the antennae, pronotum, and elytra. Given monophyly and morphological diagnostic characters, Heteroborips is validated as genus bona and includes the type species, Heteroborips cryptographus, combination reinstated, and Heteroborips seriatus, new combination.

The two North American species currently placed in Dolichosoma Stephens, namely D. foveicolle (Kirby, 1837) (widespread in North America) and D. tenuiforme Horn, 1880 (“Texas”), were critically examined. After investigation of type specimens and comparison with Palearctic members of Dolichosoma and Psilothrix Küster, D. foveicolle is transferred to the latter genus as Psilothrix foveicollis (Kirby, 1837), new combination, and D. tenuiforme is considered to be based on a mislabeled specimen of D. lineare (Rossi, 1794) and becomes a new junior synonym of that species. Consequently, the genus Dolichosoma is not represented in the North American fauna, and Psilothrix is recognized as the only truly Holarctic genus of Dasytinae.

Páramo is a fragmented alpine ecosystem above the tree line in the Tropical Andes that is characterized by high species endemism. The genetic diversity of beetle populations present in páramo is poorly understood. I evaluated the effects of potential geographical barriers, genetic structure, and diversification rates on the genetic diversity of Pelmatellus columbianus (Reiche), a widely distributed ground beetle species, and examined if populations show any signs of becoming more restricted to higher elevations due to climate warming. To understand the distribution of genetic variation in P. columbianus, one nuclear and one mitochondrial gene from 87 individuals from eight páramo sites in the Ecuadorian Andes were analyzed using phylogenetics, population genetics, and ecological niche modeling (past and present). These analyses show weak genetic differentiation among populations of P. columbianus that have a high level of genetic connectivity across sites, with dominant haplotypes recorded across the species range. Results suggest that the ability of this species to disperse has limited its genetic differentiation in specialized páramo environments, consistent with records that indicate that P. columbianus is not restricted to páramo, but its distribution extends into inter-Andean valleys.

A new species of the staphylinid genus Philothalpus Kraatz, 1857 from Colombia is described and illustrated. This is the first known species from the Colombian Andes and is found in the coffee region (Quindío and Risaralda departments) associated with secondary premontane forests, Guadua forests, and coffee plantations. The new species is compared with Philothalpus chloropennis Chatzimanolis and Ashe from Panama.

Adults of eight species of beetles in the subfamily Elaphrinae (Coleoptera: Carabidae: Elaphrinae) were collected in the Far North of Ontario and on Akimiski Island, Nunavut, Canada. We found first records for Nunavut (territory) of seven species: Blethisa julii LeConte, 1863; Blethisa quadricollis Haldeman, 1847; Diacheila arctica (Gyllenhal, 1810); Elaphrus americanus Dejean, 1831; Elaphrus lecontei Crotch, 1876; Elaphrus clairvillei Kirby, 1837; and Elaphrus fuliginosus Say, 1830. Our record of one species, Elaphrus californicus Mannerheim, 1843, is a new range record for the province of Ontario.

Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae) has a great capacity to destroy stored grain worldwide. We report on the sensilla on the antennal funiculus of S. zeamais, using classical anatomical methods and scanning electron microscopy to obtain a detailed database of the antennal sensilla for each sex. The antenna is composed of eight antennomeres. Average antennal length is 781.58±20.64 µm for males and 808.91±11.80 µmfor females. Six types and subtypes of sensilla were identified on the funiculus: squamiform, basiconic (2 subtypes), chaetic (2 subtypes), and coeloconic. Sensilla squamiformia are distributed evenly but in few numbers on male and female antennomeres. Sensilla basiconica can be divided into subtypes, SB1 and SB2, according to the shape of the cone. Both subtypes occur on the last antennomere of the flagellum and there are fewer SB2 than SB1. Sensilla chaetica appear in the same position as sensilla basiconica and have two subtypes, SC1 and SC2. Significant differences were not found in the types of sensilla on the antennae of the two sexes, but a difference was found in the number of sensilla.

Leaping somersaults and their associated behaviors are documented in four distantly related genera of tiger beetles and are therefore likely a primitive ability. When prodded or pinched on their abdomen, simulating the sting of a methochine thynnid wasp, larvae of the tiger beetles Omus dejeani Reiche, Tetracha carolina (Linnaeus), Cicindela duodecimguttata Dejean, Cicindela lengi Horn, and Cicindela tranquebarica Herbst rapidly flex and arch their bodies, which often rolls them forward for short distances or even launches them into aerial somersaults. These behaviors are similar to, if less dramatic than, those previously reported for Habroscelimorpha dorsalis (Say) and appear to be exaptations for wheel locomotion.

Miridiba (Pledina) lamellata Gao and Fang, new species (Coleoptera: Scarabaeidae: Melolonthinae), from Yunnan province in southwestern China is described and illustrated. A key to the species of the genus Miridiba Reitter known to occur in China is provided.

Two new species of Styphlomerus Chaudoir, 1875 (Styphlomerus devagiriensis Akhil and Thomas and Styphlomerus striatus Akhil and Thomas) are described from southern India. A key to the Indomalayan and Palearctic species of Styphlomerus is provided.