The western Canadian and Alaskan species of CorticariaMarsham, 1802 are reviewed. After this review, there are 29 species recognized from western Canada and Alaska. The following are reported for the first time from North America: Corticaria kabakovi Saluk, new continent record; and for the first time from Canada: Corticaria arctophila Fall, Corticaria cavicauda Fall, Corticaria fulva (Comolli), Corticaria inconspicua Wollaston, Corticaria planula Fall, and Corticaria prionodera LeConte, new country records. Twelve new species are described from Canada: Corticaria alta Hammond and Chambers, Corticaria arborea Hammond and Chambers, Corticaria bousqueti Hammond and Chambers, Corticaria cylindracea Hammond and Chambers, Corticaria langori Hammond and Chambers, Corticaria maritima Hammond and Chambers, Corticaria montana Hammond and Chambers, Corticaria pseudofennica Hammond and Chambers, Corticaria pseudoincerta Hammond and Chambers, Corticaria pseudopinetorum Hammond and Chambers, Corticaria pseudovicollis Hammond and Chambers, and Corticaria pseudotsuga Hammond and Chambers. An additional two new species are described from Montana: Corticaria andrewsi Hammond and Chambers and Corticaria aspera Hammond and Chambers. After examination of North American type material the following nomenclatural and taxonomic changes are proposed: Corticaria dentigera LeConte is placed in synonymy with Corticaria rubripes Mannerheim, new synonymy; Corticaria grossa LeConte is taken out of synonymy with Corticaria pubescens (Gyllenhal) and instead is placed in synonymy with Corticaria punctulata Marsham, new synonymy; Corticaria valida Fall is placed in synonymy with Corticaria aphictoides Reitter, new synonymy; Corticaria varicolor Fall is placed in synonymy with Corticaria impressa (Olivier), new synonymy; Corticaria falliHetschko, 1929, should be adopted in lieu of Corticaria cribricollisFall, 1899, as the latter is a junior primary homonym of Corticaria cribricollisFairmaire, 1863; and the following names are declared nomina dubia until type specimens can be located: Corticaria canaliculataMannerheim, 1853; Corticaria columbiaFall, 1899; Corticaria salpingoidesMotschulsky, 1867; and Corticaria spinulosaMannerheim, 1852. A key to the Canadian and Alaskan fauna and discussion of all current North American species is provided.

Recent research has shown that Anthrenus pimpinellae (Fabricius, 1775) is a complex of species numbering at least 21 in the Palearctic region. No work has been published illustrating what A. pimpinellae pimpinellae looks like relative to any other species in the complex, which interferes with accurate recording. Two species are considered here: A. pimpinellae pimpinellae and Anthrenus amandaeHolloway, 2019. Identification of both species is confirmed by examination of the male genitalia. There are consistent differences between the species and relatively little intraspecific variation, offering routes to identification under field conditions. In addition, the validity of A. amandae as a distinct species is clarified.

The utility of the cosmopolitan scuttle fly, Megaselia scalaris (Loew, 1866) (Diptera: Phoridae), as a biological control agent of the litter-dwelling darkling beetle Luprops tristis (Fabricius, 1801) (Coleoptera: Tenebrionidae), a serious home-invading pest of southern India, is reported. In the laboratory, M. scalaris parasitized dormant, aggregated populations of L. tristis. Megaselia scalaris completed its life cycle by feeding on the decaying substrate consisting of dead L. tristis and their excreta. Megaselia scalaris larvae fed on the viscera of parasitized L. tristis within a day and were not deterred by the defensive gland secretion of the host. The scuttle fly preferred L. tristis as a food source even when an alternative organic food source was available, and it parasitized only inactive L. tristis. Our results are contrary to the presently existing conclusion that facultative parasitism by M. scalaris in laboratory cultures of target organisms makes it unsuitable as a biological control agent of L. tristis.

Sinaphaenops (s. str.) lipoin. sp. is described and illustrated from a limestone cave in central Guizhou Province, China. This new species is most similar to S. (s. str.) banshanicus Tian, Chen and Tang, 2017. Both species are members of a peculiar species-group in the nominate subgenus Sinaphaenops (s. str.) Uéno and Wang, 1991, based on the presence of anterior lateromarginal setae on the pronotum and preapical pores on the elytra. In addition, the male genital characteristics of S. (s. str.) orthogenysUéno, 2002 are described for the first time.

Aquatic beetles in the families Dryopidae, Dytiscidae, Elmidae, Gyrinidae, Haliplidae, Helophoridae, Hydraenidae, Hydrochidae, Hydrophilidae, Noteridae, and Scirtidae were collected from the University of Mississippi Field Station (UMFS) in north-central Mississippi during May 2014 through August 2019. Located in the headwaters of the Little Tallahatchie River, UMFS encompasses 318 ha and includes over 200 ponds, springs, wetlands, and streams. We collected from mesocosms, ponds, and streams to survey the aquatic beetles of UMFS. In total, 103,113 beetles representing 132 species in 55 genera and 11 families were collected. We provide new state records for 24 species of Dytiscidae, three of Gyrinidae, three of Haliplidae, two of Hydraenidae, one of Elmidae, one of Helophoridae, one of Hydrophilidae, and one of Noteridae, with comments on the distribution, abundance, habitats, and life history of other species. Singletons represented 9.8% (13) of species collected. These data were used to estimate the total aquatic beetle species richness at UMFS and assess the effectiveness of mesocosm sampling in assessing a site's aquatic beetle richness.

Histerids are predatory beetles that can be found in almost every known environment and are of potential importance for forensic entomology. We compiled 990 records of necrophilous Histeridae in carrion from over 139 published papers, and representing five subfamilies, 42 genera and 235 species. The most representative subfamilies were Saprininae and Histerinae (together representing 92% of all records). Distributional data for all species includes 73 countries in seven geopolitical regions or continents with Europe, North America and South America being the most represented.

The New World genus Aphotaenius Cartwright (Coleoptera: Scarabaeidae: Aphodiinae: Eupariini) is reviewed. Three new species are described: Aphotaenius elegans Skelley and Vaz-de-Mello, Aphotaenius gaucho Skelley and Vaz-de-Mello, and Aphotaenius hamelae Skelley and Vaz-de-Mello. A key with diagnostic images for all included species is provided.

A new species of genus ClysterArrow, 1908, Clyster galatheaensis Gupta, Chandra, Das, and Ghosh, new species (Coleoptera: Scarabaeidae: Dynastinae: Oryctini), from Great Nicobar Biosphere Reserve, Andaman and Nicobar Islands, India, is described, diagnosed, and illustrated. The new species is compared with the likely closely related species Clyster retususArrow, 1908, known from the Andaman and Nicobar Islands (India), Indonesia, and Malaysia. A key to the Indian species of Clyster is provided.

Burying beetles (Coleoptera: Silphidae) utilize the nutrients in vertebrate carrion to reproduce. The beetles utilize the bodies of rodents and birds as a reproductive resource by burying and preparing them with secretions. Although the importance of carrion to forest and savanna soil fertility has been documented, the benefit of burying beetle brooding behavior on soil nutrients has not. Native prairie soils are among the most fertile in the world, resulting in widespread agricultural conversion. Fire suppression, allowing the spread of eastern redcedar (Juniperus virginiana L., Pinales: Cupressaceae), intense grazing, and the introduction of non-native vegetation has reduced numbers of burying beetles and potentially impacted nutrient cycling by these species. A laboratory experiment was conducted using the burying beetle Nicrophorus marginatus F. to test the influence of carcasses, beetles, and their brood on soil nutrients. Soil was placed in a 4.3-L container and treated with rat carcasses, eastern redcedar needles, and pairs of adult burying beetles. Burial success, number and weight of larvae produced, and changes to soil nutrients were recorded. Rat carcasses buried manually increased soil pH, soluble salts, and available nitrate, phosphorus, and potassium content. Beetles and their larvae increased soil nutrients far more than the manually buried rat carcasses alone. Cedar needles did not affect adult survival, brood number, or soil nutrients, although larval dry weights were significantly less in soils with cedar needles. Burying beetles and their brood increase key nutrients for plant health in native soils and are not affected by eastern redcedar needles.

Myrmecoderus veracruzensisnew species, from the tropical deciduous forest of the municipality of Xalapa, Veracruz, Mexico, is described and illustrated. A key to the species of this genus is included. Comments on macroptery in the subfamily Dacoderinae of the New World are given, and a new state record is given for Dacoderus werneri Aalbu, Andrews and Pollock.

Immanus virago Wang, Smith and Cognato, new species, is described from Borneo (Sabah). It is distinguished from the morphologically similar species I. sarawakensis (Eggers) by the absence of large granules on the elytral declivity. This additional species increases the known diversity of Immanus Hulcr and Cognato species to nine. A recent key to species is modified to include the new species.

Belladessus soqtapata, new species, is described from Peru from both male and female specimens. This is the third species described in this Neotropical genus, but the first with known male specimens. This is also the first species in the genus known from Peru, with the other species known from Venezuela and Suriname.

Cyclocephala marquezi Delgado and Mora-Aguilar, new species, from the tropical dry forest of the state of Veracruz, Mexico, is described and illustrated. Cyclocephala monzoni Ratcliffe and Cave is recorded for the first time from Mexico. New Mexican state records are reported for Ancognatha manca LeConte, Cyclocephala alexi Ratcliffe and Delgado, Cyclocephala barrerai Martínez, Cyclocephala berti Delgado, Cyclocephala concolor Burmeister, Cyclocephala discolor (Herbst), Cyclocephala halffteriana Martínez, Dyscinetus laevipunctatus Bates, and Stenocrates laevicollis Kirsch.

The richness of Scolytinae was quantified in Hass variety avocado orchards located at different altitudes in three municipalities in the central part of the avocado-producing belt of the Mexican state of Michoacán. The study was carried out from July 2016 to June 2017. The insects were captured using α-copaene, ethanol and querciverol + ethanol lures, which were placed in bottle traps. A total of 9,444 specimens of 62 species belonging to 29 genera of Scolytinae were collected. The species Corthylus praeustus Schedl is a new record for Mexico, and 24 species are new records for the state of Michoacán. The highest abundance and lowest diversity of Scolytinae were found in Nuevo San Juan Parangaricutiro (27 species), followed by Uruapan (32 species), and the lowest abundance but highest diversity was found in Ziracuaretiro (40 species). The most abundant species of Scolytinae were Microcorthylus invalidus Wood, Araptus schwarzi (Blackman), Corthylus detrimentosus Schedl and Hypothenemus crudiae (Panzer), which together accounted for 72.47% of the specimens collected. The feeding habits of the species collected were xylomycetophagous (41.66%), phloeophagous (31.66%), myelophagous (11.66%), xylophagous (11.66%) and spermatophagous (3.33%).