Keys to adults of all 27 genera and larvae of 19 species in 10 genera of Gymnetini that occur in the New World are presented. Supplementing the key to adults is a checklist of all species, their synonyms, and all literature citations associated with the nomenclatural epithets. Two new genera, Gymnephoria Ratcliffe and Madiana Ratcliffe and Romé, with one new species each, are described from Mexico and Martinique, respectively.

The flight wing shapes of 4,046 specimens representing 62 genera of Elmidae and 21 genera of Dryopidae were examined. Within Elmidae, non-macropterous wings were found only in the subfamily Elminae, while the subfamily Larainae had only macropterous wings. Within Dryopidae, only macropterous wings were present in almost all aquatic or semiaquatic genera, while only non-macropterous wings occurred in almost all terrestrial genera. Thus, flight wing shapes are generally a good indicator of both habitat and phylogenetic relations.

This treatise involves the genus Lasiodera Gray. The species composition of Lasiodera involves Lasiodera kirbyi (Gray), Lasiodera ruficollis (Gorham), Lasiodera rufipes (Klug), and Lasiodera trifasciata (Laporte). Lectotypes are designated for L. ruficollis, L. rufipes, and L. trifasciata. Lasiodera mulleri Pic and Enoplium ornatum Klug are synonymized with L. ruficollis, and Pelonium zonatum Thomson is synonymized with L. rufipes. Morphological structures suggest that these beetles have a carnivorous life style. It is postulated that the ancestor of this monophyletic assemblage diversified in the highlands of southeastern Brazil. It is also postulated that L. kirbyi is a mimic of the velvet ant Haplomutilla spinosa (Swederus) (Mutillidae). Included in this work are an identification key to the adults of Lasiodera species, a discussion of natural history, hypotheses of evolution, two phylogenetic trees, 26 illustrations, eight SEM micrographs, four genitalic photographs, seven habitus photographs, and one distributional map.

Microparnus Shepard, new genus, is described and Microparnus pusillus (Hinton), new combination, is proposed for Helichus pusillus Hinton, 1939. A revised key to the Neotropical genera of aquatic and semiaquatic Dryopidae is presented.

Four new species of PachybrachisChevrolat, 1836 in the eastern USA are described: Pachybrachis cubs Barney, new species; Pachybrachis ekstromorum Barney, new species; Pachybrachis troosevelti Barney, new species; and Pachybrachis zellersorum Barney, new species. Pachybrachis zellersorum belongs to the Pachybrachis viduatus species-group, and the other three new species belong to the Pachybrachis atomarius species-group. A description, figure, and range map are presented for each new species. Couplets in published keys are modified to accommodate the new species.

Six species of Leiodidae mentioned by Andrew Matthews in the Biologia Centrali-Americana are treated. Five species are redescribed and/or renamed, and one species is discussed. They are: Aglyptinus horni (Matthews) (redescription and designation of lectotype male); Aglyptinus minor (Matthews) (specimen in poor condition, discussed and considered a nomen dubium); Anogdus championi Peck and Cook, new species, misidentified as Cyrtusa blandissima (Zimmerman) by Matthews; Colenis punctulata Matthews (redescription and designation of lectotype); Colenis crassicornis Matthews (redescription and designation of lectotype); Colon hondurensisPeck, 1999, misidentified as Colon clavatum Mannerheim by Matthews. A new species from Guatemala, Colon (Myloechus) matthewsi Peck and Cook, new species, is described.

A key to the males of all 64 species of Pachybrachis Chevrolat, 1836 (Coleoptera: Chrysomelidae: Cryptocephalinae) currently known from the eastern USA is presented. Type, figure, and map citations from the literature are given for each species. Pachybrachis newmani Jacobson is reported as a replacement name for Pachybrachis limbatus Newman, which was a homonym, thus making Pachybrachis discoideus Bowditch a synonym (new status).

Photuris walldoxeyi Faust, new species, is described as a member of the Photuris versicolor species-group. It can be distinguished by its complex, unique flash-train + glow (FT+G) male courtship flash pattern, one of the most easily recognizable displays in North America. The primary FT+G male courtship pattern consists of a flash-train of 4–9 bright, quick, rhythmic pulses given every 0.4 seconds followed by a prolonged diffuse glow (ca. 1 second) of medium intensity at 17° C while the male hovers flashing near the tips of the branches of bald cypress and swamp vegetation growing in water. The primary FT+G is often followed immediately by a 2-pulsed secondary FT+G that effectively increases the male's visibility. Photuris walldoxeyi has thus far been confirmed in cypress and tupelo-cypress swamps of Mississippi, west Tennessee, and Indiana. During its month-long flight from May to mid-June, peak numbers are present ca. 900–1200 modified growing degree days.

The Asian lady beetle Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) is one of the most invasive insects worldwide. It has been introduced into several continents for classical biological control and by accident. The current study is the first report of this species from Iran (new country record). All developmental stages and adults of two morphs, succinea and spectabilis, were collected from fruit trees and ornamental gardens in the city of Rasht in the northern Iranian province Guilan in 2016. We collected 249 adults of the color morph succinea and 31 individuals (11%) of the melanic color morph spectabilis. Only 36% of individuals were males. Larvae and pupae were found from April to September, adults from April to October.

Type status (holotype or lectotype), current scientific name, author, and a label “designated by Zamorano/Erwin 2017” are given for species in the following Lachnophorini genera: Amphithasus Bates, 1871; Anchonoderus Reiche, 1843; Aporesthus Bates, 1871; Calybe Laporte de Castelnau, 1834; Eucaerus LeConte, 1853; Euphorticus G. Horn, 1881; Lachnophorus Dejean, 1831; Peruphorticus Erwin and Zamorano, 2014; and Pseudophorticus Erwin, 2004. Fourteen new combinations and one new status are presented across these genera.

A neotype for Tomarus bidentulus (Fairmaire, 1892) is designated, and five new species of the genus Tomarus Erichson are described and illustrated: Tomarus laticaudus López-García and Deloya, new species (Panama); T. maracaiboensis López-García and Deloya, new species (Venezuela); T. moroni López-García and Deloya, new species (Brazil); T. paranaensis López-García and Deloya, new species (Brazil); and T. pilcopataensis López-García and Deloya, new species (Peru). An illustrated key to the 35 currently known species of the genus is included.

Over the last two decades, Thailand has been surveyed extensively for its fauna of aquatic insects. During this work, we collected the first specimens of the larvae of Eulichadidae and Ptilodactylidae reported from Thailand. We provide new locality data for these families and discuss their general natural history. The larva of ?Pseudocladotoma Pic (Ptilodactylidae: Cladotominae) is described and illustrated. New country records include Eulichas birmanica Hájek and ?Pseudocladotoma Pic.

The adult scarab beetle fauna of the canopy in a lowland tropical rainforest in southern Venezuela was observed and collected by means of a 42-m-tall tower crane for a complete year. This first census of an entire Amazonian canopy scarab community was embedded within the interdisciplinary research project “Towards an understanding of the structure and function of a Neotropical rainforest ecosystem with special reference to its canopy” organized by the Austrian Academy of Science. The Scarabaeidae represented one of the most species-rich beetle families in the canopy of the crane plot and were therefore selected for a detailed analysis of host-use patterns. Thirty-three species of Scarabaeidae with 399 individuals were recorded, including two species represented by singletons. Subfamilies abundant in the canopy were the Rutelinae, Dynastinae, and Melolonthinae. Species were diurnal or nocturnal flower visitors restricted in their occurrence to their host trees during the flowering season. The scarab beetles remained commonly on one host tree species throughout the entire flowering period and switched to another host tree species only after depletion of food resources. Some species fed on extrafloral nectar but feeding on fruits and leaves was uncommon in the observed species. Most species showed a broad host range, often with abundant species recorded on several host trees. Seven species were found exclusively on one tree species. The co-occurrence of up to five congeneric species sharing the same host trees and diet was conspicuous. With this study, it could be shown how species of Scarabaeidae track available food resources within the canopy of a tropical rainforest.

Herein are reported literature records of Asilidae preying upon Buprestidae, 40 where both predator and prey were identified at least to genus, plus 12 where the prey was identified only to family. Thirty-four new predator-prey records are given. All are included in a table that includes at least 25 genera and at least 60 species of Buprestidae as prey of at least 27 genera and at least 53 species of Asilidae. We determined that nine of the published records refer to larval predation. Details of six published records and all the new records are presented. Overall, approximately 20 collections were examined. The new records come from 14 museum, university, and private collections in Australia, Switzerland, South Africa, and the USA. The listing of Chrysobothris octocola LeConte as prey in Nuevo León (Mexico) represents a new state record for the species.

The type of Crioceris aulica Fabricius, 1781 in the collection of Sir Joseph Banks at the Natural History Museum, London was examined. It turned out that this species is in fact not a member of Atelechira Lacordaire (Chrysomelidae: Clytrini), but rather a member of Hadrocnemus (Malachiidae) as Hadrocnemus aulicus (Fabricius, 1781), new combination. Hadrocnemus hilarus (Evers, 1987) may be synonymous with H. aulicus, but it is here provisionally maintained as a valid taxon pending availability of further material. Atelechira elegans (Thunberg, 1821) is restored as the valid name for the species previously referred to as A. aulica (auct., not Fabricius). A lectotype is designated for C. aulica. All examined types are illustrated, and comments on their distinguishing characters and distribution are added.

Phaedon uinta Clark and Gilbert, new species, is described from Utah and Colorado, USA, and placed in the subgenus Phaedon Megerle von Mühlfeld, 1823. The adult host is Lepidium eastwoodiae Wooten (Brassicaceae). Illustrations are provided for P. uinta and for the similar species Phaedon purpureus (Linell, 1897). A diagnostic key is provided to facilitate identification of the Phaedon species north of Mexico.

We analyzed the influence of humidity, temperature, and temporal and elevational distribution on the composition, abundance, and richness of rove beetle assemblages captured with carrion traps in a Quercus L. forest, Cerro de García, Jalisco, Mexico. Four sites with elevations ranging 2,100–2,700 m were surveyed. Beetles were captured monthly from September 2013 to August 2014. Three carrion traps were set at each sampling site, separated by 100 m distance. At each site, a data-logger was used to record temperature and humidity. In total, 18,054 rove beetles were captured, belonging to nine subfamilies, 11 tribes, 33 genera, and 75 species. The rove beetle assemblage showed the highest diversity during the rainy season (q = 0, 1 and 2) and the lowest during the dry season. The composition of the assemblage at 2,700 m elevation was mainly influenced by humidity and at 2,100 m by temperature. Beta diversity in the Quercus forest at different elevations and collecting periods was best explained by species replacements (shifts), and the interaction of humidity and temperature.

The weevil Sciaphilus asperatus (Bonsdorff, 1785) is newly recorded for the fauna of Turkey, where it occurs in the Black Sea region. Information on its morphology and distribution and an image of the adult are provided.

The third instar and pupa of Canthon bispinus Germar are described and illustrated. The larvae were reared from eggs laid by adults under laboratory conditions. Morphology of the two stages is analyzed based on characters at the generic level and compared to that of other species of Canthon Hoffmansegg. The third instar of C. bispinus can be distinguished by unique combination of chaetotaxy on the head, epipharynx, and mandibles and the number of stridulatory teeth on the maxilla. The setose pedium of the epipharynx is the main characteristic that differentiates the larva of C. bispinus from others in the genus. The morphology of both the larva and the pupa of C. bispinus conform with those characters diagnostic for the genus.

An extensive survey of lady beetles (Coccinellidae) predatory on Melanaphis sacchari (Zehntner) (Hemiptera: Aphididae) was conducted in cultivated sorghum in seven states in Mexico. In total, 495 specimens belonging to 12 species, 10 genera, six tribes, and three subfamilies were collected: Brachiacantha decora Casey, Coccinella septempunctata (Linnaeus), Coleomegilla maculata lengi Timberlake, Cycloneda sanguinea sanguinea (Linnaeus), Diomus roseicollis (Mulsant), Diomus terminatus (Say), Exochomus childreni guexi LeConte, Harmonia axyridis (Pallas), Hippodamia convergens Guérin-Méneville, Olla v-nigrum (Mulsant), Scymnus (Pullus) dozieri Gordon, and Scymnus (Pullus) loewii Mulsant. The subspecies E. childreni guexi is recorded for the first time as a predator of M. sacchari. A brief diagnosis and photographs are provided for all 12 species. COI sequences were submitted to BOLD and GenBank for nine species.