Two species of Leptoglossus Guérin-Méneville are described, L. arriolai new species from Bolivia and Colombia and L. halatus new species from Ecuador, and each placed in the “harpagon” species group. Diagnostic characters of the first antennal segment, posterolateral margins of the pronotum, expansion of the humeri and humeral angles, outer dilations of the hind tibiae, and coloration patterns are given. Images of dorsal habitus, hind leg, male genital capsule, and parameres of the new species are provided.

I reared Diachasma muliebre on the puparia of both Rhagoletis fausta, which is a new host record, and Rhagoletis indifferens from Nevada County, California, which is a new county record. The eclosion of R. fausta was earlier than that of R. indifferens under the chilling conditions used (5 °C for 150 days). The eclosion of D. muliebre trailed that of both host flies by a period sufficient to allow the host fly larvae to be late second to early third instars, the presumably preferred stage for attack by the parasitoid, at the time of wasp eclosion as determined using degree-day models that were developed for the preovipositional and egg-larval periods of R. indifferens.

Date of publication is one of the crucial requirements to confer availability of new names according to the International Code of Zoological Nomenclature (ICZN) and often volume years do not match actual publication years in journals like the Proceedings of the Entomological Society of Washington. Also, delays in production related to the COVID pandemic have created a considerable mismatch in the volume years and publication years for the Proceedings. This work explains how the Proceedings follows the 2012 amendment of the ICZN on electronic publication and provides accurate publication dates for the issues of the Proceedings registered with ZooBank and archived on BioOne.

Larvae of six species of Sciomyzidae, commonly called marsh or snail-killing flies—New Zealand's Eulimnia philpotti Tonnoir and Malloch; the Palearctic Ilione lineata (Fallén); the Nearctic Renocera cressoni Mathis and Knutson, R. longipes (Loew), and R. pallida (Fallén); and the Holarctic R. striata (Meigen)—kill and feed only on freshwater Sphaeriidae clams. These sciomyzid species are the only insects that are well documented as obligate natural enemies of bivalve Mollusca. Herein we report on the sciomyzid genus Renocera Hendel, 1900, one of the most biologically and phylogenetically important genera of this extensively studied family. We present a comprehensive taxonomic revision of the six valid species of Renocera: R. cressoni, R. johnsoni Cresson, R. longipes, R. pallida, R. striata, and R. stroblii Hendel. We divide the genus, for the first time, into subgenera: Aporenocera, new subgenus, comprising only R. johnsoni, and Renocera sensu stricto, comprising the other five species. We compare the distribution and biology of immature stages of E. philpotti and I. lineata with those of Renocera species, discuss our results and conclusions in relation to cladistic analyses of Sciomyzidae and to the evolution of behavior in Sciomyzidae, designate lectotypes for Sciomyza affinis Zetterstedt, R. pallida, and R. stroblii, describe the subgenera Aporenocera and Renocera sensu stricto, rede-scribe the six valid species of Renocera, and place Renocera lyami Withers, new synonym, as a junior synonym of Tetanocera arrogans Meigen.

Lychnocolax malagasyi new species and Lychnocolax tenuicornis new species are described from Madagascar and New Guinea, respectively. A supplemental description of Lychnocolax neobritannicus is provided with details of the wing, antenna, and mouthparts lacking in the original description. Lychnocolax neobritannicus, L. mindanao, and L. mindoro are newly documented from Thailand, and L. redinhai is newly documented from Cameroon. We provide the accurate antefrons shape of Lychnocolax insularis based on examination of the holotype. A checklist and key to all species of Lychnocolax is provided.