The Neotropical genus Marmarina Kirby, 1827 (Coleoptera: Scarabaeidae: Cetoniinae: Gymnetini) is reviewed. Marmarina parvula Ratcliffe, new species, is described from Argentina. Redescriptions, diagnoses, distributions, and illustrations of the five species are provided.

Aristobia reticulator (F., 1781), originally described from an unknown location in “British India”, is redescribed and illustrated based on specimens from northeastern India. This is the first detailed account of the external morphology of both sexes of the species, which includes external sexually dimorphic characters. A new food plant, Microcos paniculata L. (Malvaceae), for adults is reported.

A new species of exotic ambrosia beetle, Ambrosiophilus peregrinus Smith and Cognato, likely native to Asia, is described after its establishment in the United States. This species was first detected in Cherokee County, Georgia in June 2013. Since its initial discovery, the species has been found in two neighboring counties in northern Georgia. A key is presented to the species of Ambrosiophilus Hulcr and Cognato occurring in North America.

Recent collections from New Mexico and western Texas yielded striking specimens of the genus Brachys Dejean with largely blue elytra and subapical coppery patches with coppery setae. Two superficially similar species are also known from single specimens collected in Mexico. This study describes the three as Brachys rileyi Hespenheide, new species, Brachys barri Hespenheide, new species, and Brachys consimilis Hespenheide new species.

Onthophagus halffteri Zunino was originally described based on a single specimen (a hypertelic male), the only one known at that time. The capture of several series with an abundance of individuals allows us to now describe hypertelic (major), eutelic (medium), and hypotelic (minor) males and females. Additionally, the assignment of O. halffteri to the hippopotamus line within the chevrolati group of American species of Onthophagus Latreille is confirmed, with Onthophagus hippopotamus Harold the species that is most closely related to O. halffteri. The association of O. halffteri with nests of Geomyidae (Rodentia) is established, and the conditions that separate the distribution of O. halffteri from that of O. hippopotamus are given. Onthophagus halffteri and O. hippopotamus are two species that, while practically adjacent, never overlap in a given nest. Biogeographically, O. halffteri represents the largest eastward expansion of the hippopotamus line, which is distributed along the mountains of Mexico, particularly the Trans-Mexican Volcanic Belt.

A review of Dorynota Chevrolat s. str. is presented in which 18 species are included in the subgenus. Three new species are described: Dorynota (s. str.) monneorum Simões and Sekerka, new species and Dorynota (s. str.) borowieci Simões and Sekerka, new species from Brazil, and Dorynota (s. str.) wappesi Sekerka and Simões, new species from Bolivia. Two new synonyms are proposed: Dorynota (s. str.) aculeata (Boheman, 1854) = Dorynota (s. str.) pubescens (Blake, 1939), new synonymy, and Dorynota (s. str.) cornigera Boheman, 1854 = Dorynota (s. str.) bellicosa Boheman, 1854, new synonymy. Dorynota (s. str.) pugnax Boheman, 1854, restored status, is resurrected from synonymy with Dorynota (s. str.) nodosa (Boheman, 1854). Thirty-five new country and region records are reported for 10 species. A key to species and color photographs of all species are provided.

The life history and morphology of the third instar and pupa are described for Onthophagus landolti Harold, 1880 (Coleoptera: Scarabaeidae). Instar developmental time was determined by analyzing cephalic width data using generalized linear models. Morphological descriptions were done of the third instar and pupa, comparing taxonomically relevant characters to other species of Onthophagus Latreille, 1802 species. Developmental time took 30 days from egg to teneral imago. The egg period lasted 2–3 days, the larval period 20–22 days, and the pupa 6–8 days. Cephalic width ranged 0.750–0.850 mm for the first instar, 0.925–1.075 mm for the second instar, and 1.125–1.300 mm for the third instar. Duration of the first instar was 2–3 days, the second instar lasted 3 days, and the third instar 10–13 days. Onthophagus landolti larvae exhibit morphological characters common to other American Onthophagus. The principal interspecific variation in chaetotaxy was observed on the labium-hypopharynx.

Burying beetles in the genus Nicrophorus F. are necrophagous insects with many mechanisms to reduce the negative impact of competitors. The most notable mechanism is parental care provided by males and females, but equally important are burying beetles' preferences for habitat and carcass size, as well as seasonal activity. In this research, in close-to-natural conditions, we analyzed changes in activity for three burying beetle species typical to Poland (Nicrophorus vespillo L., Nicrophorus vespilloides Herbst, and Nicrophorus humator Gleditsch) at the beginning of seasonal activity on both small (Mus musculus L.) and large (Rattus norvegicus Berkenhout) carcasses. Observations during two seasons from the second week of April to the first week of June were conducted with cages placed in meadow, forest, and forest edge. Shifts among activity peaks of the burying beetle species were observed. The major differences among species which prefer different types of habitats are reported. These results suggest that the activity of burying beetles in the early phase of each season probably did not depend on the presence of other burying beetle species but on other factors such as post-winter habitat dynamics, including mean temperature. We observed few cases of a significant correlation between temperature and numbers of burying beetles. In addition, we observed changes in spatial distribution of burying beetles during the first week of activity. Differences among species were also visible in the number of individuals attracted by carcasses of different size and in the day of carcass colonization.

Rhagodera costaefragmenta Krinsky, new species, from San Clemente Island, California is described. It is only the second insular species of Rhagodera Dejean known. It resembles Rhagodera tuberculata Mannerheim but is distinguished from that species by its interrupted elytral costae. A revised key to the species of Rhagodera found north of Mexico is provided.

Neoclypeodytes moroni Arce-Pérez and Novelo-Gutiérrez, new species, is described and illustrated. Neoclypeodytes moroni is characterized by a total body length of 2.5 mm; frontal region of the head with two rows of fine punctures; clypeus elongate, trapezoidal, and fissured, its margins raised and apex slightly rounded and smooth; metacoxal length/ width ratio 3.55–3.87; elytra without sutural stria; and male genitalia with the median lobe strongly convergent in the apical third, ending in a rounded tip. By the shape of the clypeus and the large metacoxal ratio, N. moroni is considered closely related to Neoclypeodytes anasinus Miller. Both species share the characteristic in which the clypeus is projected and trapezoidal, which is unlike all other species of Neoclypeodytes Young known to date. Neoclypeodytes haroldi Miller is reported from Veracruz, Mexico for the first time.

The three species of termitophilous Scaphidiinae from Sulawesi, Indonesia are reviewed. Vituratella termitophila (Champion, 1927), hitherto known only from continental part of the Oriental region, is newly recorded from Sulawesi. A key to the Sulawesian termitophilous scaphidiines is provided.

Hydrophone recordings from three aquatic beetle species within the family Hydrophilidae, Berosus pantherinus (LeConte), Tropisternus blatchleyi (d'Orchymont), and Tropisternus collaris (F.), were used to create an automated identification program. The identification program was designed using digital signal processing techniques and is capable of identifying which species is present from hydrophone recordings alone. Using features based on the frequency content of each beetle call and background sounds in reference recordings, half-second segments of audio recordings were classified as a specific beetle species call, a general beetle distress call, or as noise. Classification accuracy ranged from 87.5% for reference recordings. Training calls had accuracies of 98% and above between beetle species and noise. The majority of beetle recordings in a mesocosm environment were classified correctly. Often, T. blatchleyi was false-positively identified in recordings with non-beetle background noises, such as frogs or traffic, suggesting similar active frequencies in the T. blatchelyi features and these noises. The use of digital signal processing to identify aquatic invertebrates by sound is a new technique that has potential uses in taxonomy, surveys, and long-term biomonitoring of aquatic systems by providing a hands-free method of detection, and eventually identification, in the field.

Two metallic green species of Pandeleteius Schönherr, 1834, Pandeleteius anneae Anderson and Ivie, new species (type locality: US Virgin Islands, St. Thomas) and Pandeleteius metallicus Anderson and Ivie, new species (type locality: Dominican Republic, Puerto Plata), are described. The two new species are easily distinguishable from other West Indian species in the genus by the metallic green scales, a deeper and more v-shaped epistomal ridge, and less strongly deflexed scrobes. The species are very similar and separable with confidence only on the basis of distribution, body size, and structure of female genitalia (male not known for P. anneae).

The Oriental genus Burumoseria Csiki, 1939 is redescribed. Burumoseria yuae Lee and Konstantinov, new species from Taiwan is described and illustrated. A key to Burumoseria species is provided. The Oriental and Australian genus Licyllus Jacoby, 1885 is synonymized with Thrasychroma Jacoby, 1885.

The lady beetle Cryptolaemus montrouzieri Mulsant has been observed in association with several mealybug species. However, only a subset of these species is considered essential food for C. montrouzieri, capable of supporting the beetle's growth and reproduction. This study evaluated the suitability of the striped mealybug, Ferrisia dasylirii (Cockerell), as prey for C. montrouzieri by determining the beetle's developmental time and predation capacity. The reproductive fitness of C. montrouzieri on a diet of mealybugs supplemented with pollen or honey was also investigated. Cryptolaemus montrouzieri completed development in about 25 days) and high larva-adult viability (98%) when fed F. dasylirii. The average number of F. dasylirii adults consumed by C. montrouzieri adults increased as a function of the number of prey provided, reaching a maximum of 1.3 prey/day. Survival of C. montrouzieri females that ate only pollen was higher than that of females deprived of food, but lower than for females preying on F. dasylirii ad libitum, with honey, or with pollen. Females deprived of food or fed only pollen did not produce eggs. Females fed F. dasylirii ad libitum or F. dasylirii honey were more fecund than females fed F. dasylirii pollen. In addition, females fed F. dasylirii ad libitum were more fertile than females fed other diets. Our results established that C. montrouzieri can successfully develop and reproduce when fed exclusively with F. dasylirii, which could easily support mass rearing of C. montrouzieri in the laboratory.