New species of Dryocosmus Giraud gallwasps from California (Hymenoptera: Cynipidae: Cynipini) galling Chrysolepis Hjelmq. (Fagaceae)
Revision of the genus Polistes Latreille (Hymenoptera: Vespidae: Polistinae) in the Philippine Islands
New species of Myrmicine ants from Western Australia(Hymenoptera: Formicidae)
Revision of Proctotrupidae (Insecta: Hymenoptera) described by Ch. T. Brues from Baltic amber
A review of the North American species of the fungus-gardening ant genus Trachymyrmex (Hymenoptera: Formicidae)
Phylogeny, classification, and species-level taxonomy of ants (Hymenoptera: Formicidae)*
A review of the Nearctic species of Erythmelus (Hymenoptera: Mymaridae), with a key and new additions to the New World fauna
Validation of Psomizopelma metallicum Gibson, 2018 (Hymenoptera: Eupelmidae)
A review of the genus Mystrium (Hymenoptera: Formicidae) in the Indo-Australian region
Phylogenetics and classification of the world genera of Diparinae (Hymenoptera: Pteromalidae)
Revision of Odontophotopsis Viereck (Hymenoptera: Mutillidae), Part 1, with a description of a new Genus Laminatilla
Contribution to the knowledge of the Neotropical genus Plagiolabra von Schulthess (Hymenoptera, Vespidae, Eumeninae)
Plectocynipinae, a new subfamily of Figitidae and description of a new Neotropical genus of Thrasorinae (Hymenoptera: Cynipoidea)
Ammophila nancy Menke, a new species in the pruinosa complex (Hymenoptera: Sphecidae: Ammophilinae)
Rediscovery and revision of Foenobethylus Kieffer, 1913 (Hymenoptera, Bethylidae)
Three new species of Euglossa Latreille (Hymenoptera: Apidae) from Brazil
Description of a New Species of Pararrhynchium Saussure (Hymenoptera, Vespidae, Eumeninae) from Taiwan with a Catalogue of the Pararrhynchium Species
A taxonomic revision of the hover wasp genus Eustenogaster van der Vecht (Insecta: Hymenoptera; Vespidae, Stenogastrinae)
Skeletomusculature of Scelionidae (Hymenoptera: Platygastroidea): head and mesosoma
New Caledonia as the centre of origin of Parastephanellus Enderlein, with a phylogeny and description of the female of P. khogis Aguiar (Hymenoptera, Stephanidae)
A new synonym for Enicospilus grammospilus (Enderlein, 1921) (Hymenoptera: Ichneumonidae: Ophioninae)
Description of the first endemic Polistes Latreille, 1802 from Sulawesi (Hymenoptera: Vespidae: Polistinae)
Species of Dirhinus Dalman, 1818 (Hymenoptera: Chalcididae, Dirhininae) from Saudi Arabia: new species and a new record
A taxonomic review of Paramblynotus Cameron, 1908 in China, with descriptions of five new species (Hymenoptera: Cynipoidea: Liopteridae)
A new Costa Rican species of Leptanilloides (Hymenoptera: Formicidae: doryline section: Leptanilloidinae)
First record of the genus Darnilia van Achterberg, 1989 (Hymenoptera: Braconidae: Rogadinae) from Vietnam, with description of three new species
Contribution to the genus Okinawepipona Yamane (Hymenoptera: Vespidae: Eumeninae) from Vietnam, with description of a new species
Gatesina colombiana n. gen. & n. sp. (Hymenoptera: Chalcidoidea, Eurytomidae), new Rileyinae associated with Myrcianthes (Myrtaceae) from Colombia
A new species of Zethus Fabricius (Hymenoptera, Vespidae, Zethinae) from Northeast Brazil, with notes on morphology and distributional records of Z. alessandroi Lopes