Illuminating a Dark Taxon: Revision of European Trichacis Förster (Hymenoptera: Platygastridae) reveals a glut of synonyms.

The parasitoid wasp genus Trichacis Förster is revised for Europe. Examination of historical and modern collections combined with DNA barcoding revealed the presence of only a single species in Europe, Trichacis tristis (Nees, 1834), redescribed here. Fourteen new synonymies are proposed for T.

New records of German Scelionidae (Hymenoptera: Platygastroidea) from the collection of the State Museum of Natural History Stuttgart.

Background: Scelionid wasps are arthropod egg parasitoids, many of which are relevant to global biosecurity. However, the scelionid fauna of Germany has not received much attention from professional taxonomists.

New Information: Eleven species and four genera are recorded for the first time from Germany, including species of interest to agriculture and biological control.

A fortuitous find: a unique haplotype of Ishii (Encyrtidae: Encyrtinae) discovered in Florida.

The adventive arrival of biological control agents circumvents the regulatory process by introducing exotic species to control invasive pests and is generally followed by post hoc risk evaluation. The bean plataspid, (Fabricius) (Hemiptera: Plataspidae), is an invasive pest of leguminous crops in the south-eastern United States that was eventually followed by two parasitoid wasps from its range in the eastern hemisphere, (Dodd) (Scelionidae) and Ishii (Encyrtidae). In North Central Florida, sentinel egg masses, intended to capture , instead yielded , which was previously known only from Alabama (Ademokoya et al.