We report 22 parasitoid species from Greece that have emerged from their hosts belonging to Blattodea, Coleoptera, Hymenoptera and Lepidoptera, including 12 Braconidae, one Eulophidae, one Evaniidae, seven Ichneumonidae, and one Tachinidae. Nine parasitoids are reported for the first time in Greece, i.e., three Ichneumonidae: Campoplex difformis (Gmelin, 1790), Gelis albipalpus (Thomson, 1884), and Lysibia tenax Townes, 1983; five Braconidae: Charmon cruentatus Haliday, 1833, Dendrosoter protuberans (Nees, 1834), Dolichogenidea longipalpis (Reinhard, 1880), Ecphylus silesiacus (Ratzeburg, 1848), and Spathius curvicaudis Ratzeburg, 1844; and one Eulophidae: Melittobia acasta (Walker, 1839). Nine of the 23 recorded parasitoid-host associations are new. These findings are discussed in relation to the overall related parasitoid-host associations in the target area, as well as the potential of parasitoid use in the biological control of pests.

The parasitoids (Hymenoptera: Braconidae: Aphidiinae) of Macrosiphoniella del Guercio (Hemiptera: Aphididae) from the western Palaearctic region are reviewed and keyed. The host associations and distribution of each species are summarized. Aphidius stigmaticus sp. nov. reared from Macrosiphoniella tanacetaria on Tanacetum polycephalum, which is another member of the Macrosiphoniella aphid parasitoid guild from high-mountain habitats in western Iran, is described in the present contribution. Some taxonomic problems within Macrosiphoniella parasitoid guilds are discussed as well.

The results of more than 120 years of investigation of the fauna of Gasteruptiidae for the territory of former Yugoslavia (including Bosnia and Herzegovina, Croatia, FYR of Macedonia, Montenegro, Serbia and Slovenia) are summarized. Results from recently collected material and from unidentified specimens in collections are combined with those of published records. The total number of valid species of the genus Gasteruption Latreille for the area of former Yugoslavia is 22, which is more than in any country represented in Fauna Europaea database. One species is firstly recorded for the mainland Europe (G. syriacum Szépligeti), two more species are newly recorded for the investigated area and there are 23 first country-records for the involved countries (based on 17 species).

Using CO1 sequence analysis, we investigated the relationships of Western Palearctic and Nearctic Cotesia that spin aggregated cocoons in the shape of a ball, and as adults are morphologically very similar. The analysis included the conceptual taxa C. tibialis, C. ofella, C. vanessae, C. ruficrus, C. xylina and C. yakutatensis, as well as the newly described species C. trivaliaesp. nov. The examined specimens of C. tibialis, C. ofella, C. vanessae, C. ruficrus and C. trivaliaesp. nov. were collected in several European countries, and C. xylina and C. yakutatensis in Canada and the USA. Molecular analyses showed that C. ruficrus is not closely related to the other studied taxa. Based on the genetic distances as well as biology and morphology, C. vanessae and C. ofella are confirmed as solid taxa. The species C. yakutatensis comprises two entities. Having 8 haplotypes, C. tibialis also emerges as a species complex, divided into two clusters. With 26 detected haplotypes, C. xylina shows the highest diversity, being composed of three segregates. The conceptual species C. tibialis, C. xylina and C. yakutatensis seem to be species complexes containing several candidates for recognition as distinct species. One from the European C. tibialis complex is here described as new, and the impediments to be overcome before the description of further species are outlined.