A new and the second fossil species of the genus Ephedrus Haliday, 1833(Hymenoptera: Braconidae: Aphidiinae) from Baltic amber.

A new species of aphid parasitoid, Ephedrus carsteni Davidian, sp. nov. (Braconidae: Aphidiinae), is described and illustrated from Late Eocene Baltic amber. This new species was compared with the fossil Ephedrus mirabilis Timon-David, 1944 (Oligocene imprint from Bassin de Marseille), E. primordialis Brues, 1933 (Eocene Baltic amber) and E. rasnitsyni Davidian & Kaliuzhna, 2021 (Eocene Sakhalinian amber), as well as with the extant E. validus (Haliday, 1833) and E. carinatus Tomanovic, 2020.

Third new fossil species of the genus Ephedrus Haliday, 1833 (Hymenoptera: Braconidae: Aphidiinae) from Baltic amber.

A new species of aphid parasitoid from the genus Ephedrus Haliday, E. zaikai Davidian, sp. nov. (Braconidae: Aphidiinae), is described and illustrated from Late Eocene Baltic amber. This new species was compared with described fossil taxa Ephedrus mirabilis Timon-David, 1944 (Oligocene imprint from Bassin de Marseille), Ephedrus carsteni Davidian, 2023 and E. primordialis Brues, 1933 (both from Eocene Baltic amber), and E. rasnitsyni Davidian & Kaliuzhna, 2021 (Eocene Sakhalinian amber), as well as with extant E. niger Gautier, Bonnamour & Gaumont, 1929 and E. chaitophori Grdenfors, 1986.

A new genus and species of the aphid parasitoids (Hymenoptera: Braconidae: Aphidiinae) from Baltic amber.

A new genus and species, of aphid parasitoid, Protoctonus groehni Davidian, gen. et sp. nov. (Braconidae: Aphidiinae), are described from Late Eocene Baltic amber. This new genus is similar to fossil genera Protacanthoides Mackauer, 1961, Promonoctonia Star, 1973 and Sakhalinoctonus Davidian, 2021, as well as with extant Calaphidius Mackauer, 1961, Falciconus Mackauer, 1959 and Aclitus Foerster, 1862. The new genus differs from aforementioned ones by having fewer antennomeres, and in elements of fore wing venation, propodeum areolation, and shape and setosity of the ovipositor sheath.

New species of the aphid parasitoids of the genus Binodoxys Mackauer (Hymenoptera: Braconidae: Aphidiinae) from the fauna of Russia.

The descriptions of two new species from the genus Binodoxys Mackauer characterised by short prongs on the posterior margin of the last metasomal sternite are provided from the north-western territory of the European part and Eastern Siberia of Russia. Binodoxys crataegi sp. nov. was reared from the aphid Aphis pomi De Geer, 1773 on Crataegus sp. in the St. Petersburg region, but B. ekaterinaе sp. nov. was collected by net in Irkutsk Province, near Baikal Lake, and the host is unknown.

Two new species of the genus Areopraon Mackauer, 1959 (Hymenoptera: Braconidae: Aphidiinae) from the Russian Far East.

Two new species of the aphid parasitoid genus Areopraon Mackauer, 1959, A. tricolor Davidian, sp. nov. and A. vladivostoki Davidian, sp. nov., are described and illustrated from the fauna of the Russian Far East.

A new genus and new species of subfamily Trioxinae (Hymenoptera: Aphidiidae) from the Far East of Russia.

A new Trioxinae (Aphidiidae) genus Sergeyoxis gen. nov., with type species S. monoceratus sp. nov., is described and illustrated from the Russian Far East. This new genus is closely related to Parabioxys Shi et Chen, 2001, but differs from the latter by the development of a single long process (prong) which is not fused with the sixth sternite, fore wing darkened and narrow, and petiole short. Sergeyoxis gen. nov. differs from the all other trioxine taxa by the presence of mobile unpaired process between two last sternites of metasoma.