The Oriental species of the genus Pseudonortonia Giordani Soika (Hymenoptera: Vespidae: Eumeninae).

The species of the genus Pseudonortonia Giordani Soika, 1936 occurring in the Oriental region are revised. Three new species, namely Pseudonortonia camarinensis sp. nov.

A new species of from Vietnam and an updated key to species of the genus (Hymenoptera, Apidae).

The rare bee genus Lieftinck, 1974 is recorded for the first time from Vietnam. The genus is represented by a new species, Tran, Engel & Nguyen, , from Cao Bang Province and can be most easily confused with Wu from China. The species is most easily differentiated by the unique form of the male terminalia but can also be distinguished by differences in integumental and setal coloration.

Biology of the southern giant hornet, : nest architecture, morphological differences among castes, and the genetic structure of colonies.

Giant hornets in the genus are apex predators that are known throughout Asia for their exceptional size and devastating group attacks on social insect colonies. The giant hornets include , a well-studied and widespread temperate species, and , a poorly known sister species that is limited to subtropical and tropical regions of Southeast Asia. Both species have been recently documented on the west coast of North America, raising urgent questions about their potential impact in novel ecosystems.

The solitary wasp genus from Vietnam, with descriptions of two new species (Hymenoptera, Vespidae, Eumeninae).

New data are presented for the potter wasp genus van der Vecht (Eumeninae, Odynerini) occurring in Vietnam. Two species are described as new to science: and van der Vecht is synonymized with (de Saussure); the male genitalia of this species are described for the first time. An updated key is presented to all species of the genus.

Discovery of the male of Okinawepipona yty Nguyen, 2018 (Hymenoptera: Vespidae: Eumeninae) from Vietnam.

The male of Okinawepipona yty Nguyen, 2018 is described and illustrated for the first time, together with its genitalia, based on specimens from Y Ty, Lao Cai, Vietnam. In addition, the male genitalia of O. curcipunctura Nguyen & Xu, 2014 is also described for the first time.

The potter wasp genus from Vietnam, with descriptions of three new species and a new country record (Hymenoptera, Vespidae, Eumeninae).

Species of the potter wasp genus van der Vecht (Eumeninae: Odynerini) occurring in Vietnam are presented. Seven species have been recorded from Vietnam. Of them, three species are described as new to science: Nguyen, Tran & MT Nguyen, , Nguyen & AD Nguyen, , and Nguyen & Engel, , and one species, (Fabricius, 1804), is recorded from Vietnam for the first time.

A new species of from a Vietnamese cave, with remarkable secondary sexual characters in males (Callipodida, Paracortinidae).

A new millipede species, , is described from a cave in Cao Bang Province, northern Vietnam. The new species is diagnosed by having an extraordinarily long projection on the head of males, reduced eyes, a gonocoxite with two processes, a long and slender gonotelopodite with two long, clavate prefemoroidal processes densely covered with long macrosetae apically, and with a distal, reverse, short spine on mesal side, and a rather sinuous distal part of the telopodite. This is the third species of the genus that is known from Vietnam.

The bee genus in Vietnam: descriptions of five new species and the first male of (Hymenoptera, Megachilidae).

The Vietnamese fauna of bees in the Cockerell (Megachilinae, Anthidiini) is reviewed. Seven species are recognized, representing two subgenera. Five new species are described and figured as: Anthidiellum (Clypanthidium) nahang Tran, Engel & Nguyen, , A.

Two new species of Trichrysis Lichtenstein (Hymenoptera: Chrysididae) from Vietnam and China, with taxonomic notes on other species from the Oriental region.

Two new species of the genus Trichrysis Lichtenstein, belonging to the cyanea species group, are described from northeastern Vietnam (Cao Bang Province) and China (Yunnan Province) as new for science: T. sinica Rosa, Nguyen & Wiśniowski, sp. nov.

First occurrence of the little-known genus (Hymenoptera, Megachilidae) from Vietnam: discovery of a new species and a key to the Southeast Asian fauna.

The little-known megachiline genus Cockerell, 1931 is recorded from Vietnam for the first time. A new species, Tran, Engel & Nguyen is described and figured based on a series of females collected from the provinces of the northern and central highlands of Vietnam. The genus is briefly discussed and a new subtribe is established, Noteriadina Engel, Tran & Nguyen of Megachilini.

Carriage of Plasmid-Mediated Colistin Resistance-1-Positive Escherichia coli in Humans, Animals, and Environment on Farms in Vietnam.

Plasmid-Mediated Colistin Resistance 1 (mcr-1) was first reported in 2015 and is a great concern to human health. In this study, we investigated the prevalence of mcr-1 and mcr-1-positive Escherichia coli (MCRPEC) and the association in infection status among various reservoirs connected to livestock. The study was conducted in 70 poultry and swine farms in a commune in Ha Nam province, northern Vietnam.

A new genus of minute stingless bees from Southeast Asia (Hymenoptera, Apidae).

A new genus of minute stingless bees (Meliponini: Hypotrigonina) is described from Southeast Asia. Engel & Nguyen, , is based on the type species Engel, recorded from Vietnam, Thailand, Laos, Cambodia, and southern China. The species was previously considered an enigmatic member of Moure, but is removed to a new genus based on its unique male terminalia that differs considerably from that of and instead shares resemblances with Moure, and the presence of yellow maculation (also similar to that of ).

Contribution to the genus Pararrhynchium de Saussure (Hymenoptera: Vespidae: Eumeninae), with description of two new species from Vietnam.

Two new species of the genus Pararrhynchium de Saussure are described as new to science: P. simsanum Nguyen and Tran, sp. nov.

Linking the Morphology of Sternal Glands to Rubbing Behavior by (Hymenoptera: Vespidae) Workers During Recruitment for Group Predation.

The activities of social insect colonies are supported by exocrine glands and the tremendous functional diversity of the compounds that they secrete. Many social wasps in the subfamilies Vespinae and Polistinae have two sternal glands-the van der Vecht and Richards' glands-that vary in their features and function across the species in which they are found. Field observations suggest that giant hornets use secretions from the van der Vecht gland to chemically mark targeted nests when workers initiate group attacks on social insect prey.

Comparison of the External Morphology of the Sternal Glands for Hornets in the Genus .

Many social wasps in the speciose subfamilies Polistinae and Vespinae have two sternal glands-the van der Vecht gland and the Richards gland-that are not found in other insects. The presence of these glands has been confirmed in only 6 of 22 hornet species (genus ) and images of their fine structure have not been produced. Here; we characterize the external morphology associated with both glands for workers of nine species using scanning electron microscopy.

Giant hornet () attacks trigger frenetic antipredator signalling in honeybee () colonies.

Asian honeybees use an impressive array of strategies to protect nests from hornet attacks, although little is understood about how antipredator signals coordinate defences. We compared vibroacoustic signalling and defensive responses of colonies that were attacked by either the group-hunting giant hornet or the smaller, solitary-hunting hornet . colonies produced hisses, brief stop signals and longer pipes under hornet-free conditions.

Bright green fluorescence of Asian paper wasp nests.

An exceptionally bright fluorescent biomatter was discovered when exploring, with UV-A light, the nests of several oriental paper wasp species of the genus , a genus of diurnal social insects. Fluorescence spectra of the cocoon cap membranes revealed narrow emission bands in the green range of the visible spectrum. Large Stokes shifts of around 160 nm and high fluorescence quantum yields of up to 35% were measured.

New findings on the taxonomy of the genus Coeleumenes van der Vecht (Hymenoptera: Vespidae: Eumeninae) from Vietnam, with description of a new species.

A new species of the genus Coeleumenes van der Vecht is described from Tay Nguyen highland in southern Vietnam: Coeleumenes chumomray Mai and Nguyen, sp. nov. A key to all known species in the Oriental Region is provided.

Review of Holophris Mocsáry/ (Hymenoptera: Chrysididae) from Vietnam, with description of a new species.

The genus Holophris Mocsáry, 1890 of the tribe Elampini (Chrysidinae) is reviewed in Vietnam for the first time. A new species, H. melinh Nguyen Wiśniowski, sp.

Honey bees (Apis cerana) use animal feces as a tool to defend colonies against group attack by giant hornets (Vespa soror).

Honey bees (genus Apis) are well known for the impressive suite of nest defenses they have evolved to protect their abundant stockpiles of food and the large colonies they sustain. In Asia, honey bees have evolved under tremendous predatory pressure from social wasps in the genus Vespa, the most formidable of which are the giant hornets that attack colonies in groups, kill adult defenders, and prey on brood. We document for the first time an extraordinary collective defense used by Apis cerana against the giant hornet Vespa soror.

Taxonomic study on the genus Pseudozumia de Saussure (Hymenoptera: Vespidae: Eumeninae) from Vietnam, with description of a new species.

A taxonomic study on the genus Pseudozumia de Saussure from Vietnam is presented. One species previously identified as Pseudozumia indica indica (de Saussure, 1855) is described as new, namely P. cucphuongensis Nguyen, sp.

Taxonomic notes on the genus Vespa Linnaeus, 1758 (Hymenoptera: Vespidae: Vespinae) from Vietnam, with a new record of a species and an updated key to species.

A taxonomic study on the genus Vespa from Vietnam is presented. One species, Vespa fumida van der Vecht, 1959 is recorded as new for the Vietnamese fauna. The complete queen nest of Vespa mocsaryana du Buysson, 1905 is described, together with the queen.

Additional knowledge respecting taxonomy of the social wasp genus Ropalidia (Hymenoptera: Vespidae: Polistinae) from Vietnam, with new records of three species and an updated key to species.

Species composition of social wasps of the genus Ropalidia from Vietnam is reported, with 24 species having been recorded. Of those, three species are newly recorded for the Vietnamese fauna, namely Ropalidia binghami van der Vecht, 1941, R. parartifex Tan van Achterberg, 2014 and R.

Taxonomic review and distribution of the genus Vespula Thomson, 1869 (Hymenoptera: Vespidae: Vespinae) from Vietnam.

A taxonomic review of the genus Vespula Thomson in Vietnam is reported. Three species are recorded: V. flaviceps (Smith, 1870), V.

Taxonomic studies on the genus Orancistrocerus van der Vecht, 1963 (Hymenoptera: Vespidae: Eumeninae) from Vietnam, with description of a new species.

Two species of the genus Orancistrocerus van der Vecht, 1963 from Vietnam are recorded. Of them, a new species, O. altus sp.