Ekaterina V. Tselikh

Paleolelaps draco Tselikh & Rasplus gen. et sp. nov. is described as the first fossil representative of Diparidae (Hymenoptera: Chalcidoidea) from Late Eocene Baltic amber. This record constitutes the first fossil species and the oldest known representative of the family. The new genus is assigned to Diparidae based on the combination of a concealed labrum bearing a marginal row of setae, a distinct frenum, a recessed metanotum, transversely wrinkled metacoxae, and a conspicuous cercal brush anterior to each cercus. Within Diparidae, Paleolelaps occupies an intermediate morphological position between Dipara Walker, 1833 and Lelaps Walker, 1843 in having a clypeus bearing a single angular median tooth in combination with the first antennal funicular being relatively short, only 1.10–1.14× the length of the second funicular.

Based on a female inclusion in Upper Eocene Baltic amber (Kaliningrad Region, Russia), Coriotela rasnitsyni Tselikh & Mitroiu sp. nov. is described and illustrated. The new species is the second known representative of the fossil genus Coriotela Burks & Heraty, 2020. It is similar to the type species, C. lasallei Burks & Heraty, 2020, but is distinguished mainly by the following morphological features: clava with large micropilosity area on antennal clavomeres 1‒4, postocellar line 2.0× ocellocular line, and fore wing with speculum.

This paper reviews the Palaearctic species of the genus Syntomopus Walker, 1833. A new species, Syntomopus dzhanokmenia sp. nov ., is described from Russia, Turkey, Kazakhstan and China. All available types are redescribed and illustrated. The species S. crassicornis (Szelényi, 1970) and S. incisus Thomson, 1878 are synonymised under S. thoracicus (Walker, 1833). Syntomopus thoracicus is recorded for the fauna of Uzbekistan for the first time and S. oviceps Thomson, 1878 for the fauna of Kazakhstan. An identification key for females and males of all Palaearctic Syntomopus species is provided.

The hymenopteran parasitoid complex of the families Eurytomidae and Pteromalidae associated with Lixus subtilis Boheman, 1836 (Coleoptera, Curculionidae) developing on sugar beet is studied in China (Xinjiang region). Eurytoma curculionum Mayr, 1878 (Eurytomidae) was reared from the larvae of Lixus subtilis and recorded for Xinjiang, China, for the first time. A new species, Chlorocytus papahemii sp. nov . (Pteromalidae), a hyperparasitoid of E. curculionum , is described from China. Illustrations and a detailed morphological description of the new species, as well as a redescription of the types of related Chlorocytus species, are provided. An identification key for females of the Chlorocytus harmolitae species is given.

The article provides a detailed, illustrated description of a new genus and species, Vedma circe gen. et sp. nov., belonging to the tribe Miscogastrini (Chalcidoidea: Pteromalidae: Miscogastrinae) from South Korea. The new genus is distinguished by the following combination of characters: a massive head; lower margin of the clypeus with three asymmetrical teeth; large, circular tentorial pits positioned on either side of the clypeus; a rounded and sloping pronotal collar; a mesosoma with complete, shallow, widely spaced notauli; and the forewing with a large stigma.

The species of Acroclisoides Girault & Dodd (Pteromalidae: Metasteninae) are revised. Twenty-three world species are recognized based on females, of which eight new species are described: Acroclisoides bimaculatus Tselikh, sp. nov. (Australia), A. fusus Tselikh & Mitroiu, sp. nov. (Africa), A. marimbae Tselikh & Mitroiu, sp. nov. (Africa), A. miklukhai Tselikh, sp. nov. (Papua New Guinea), A. nongae Tselikh, Lee & Ku, sp. nov. (Eastern Palearctic), A. simbis Tselikh & Mitroiu, sp. nov. (Africa), A. supramaculatus Tselikh, sp. nov. (Australia) and A. suryai Tselikh, sp. nov. (India). The genus Golovissima Dzhanokmen, 1982, syn. nov. , is synonymized under Acroclisoides Girault & Dodd, 1915; the species Euneura borocerae Risbec, 1957, previously included in Acroclisoides by Bouček (1976), is transferred to Agiommatus Crawford, 1911, as A. borocerae (Risbec, 1957), comb. nov. The hitherto unknown male of A. major Girault & Dodd, 1915 is described for the first time. The following new records are reported: A. laticeps Girault & Dodd, 1915 from Papua New Guinea; A. luzonensis Gahan, 1920 from Indonesia, Malaysia and Republic of Korea; A. sinicus (Huang & Liao, 1988) from Japan and Vietnam; A. solus Grissell & Smith, 2006 from Japan and Russia. All the species are described or redescribed and illustrated by macrophotography, including type material of previously described species, and a key for the identification of the twenty-three known species is given.

A new genus of Pteromalidae Krasava Tselikh, Rasplus & Lee, gen. nov., along with its type species Krasava sergeyi Tselikh, sp. nov., is described from the Republic of Korea. The genus can be distinguished by the following combination of characters: clypeus with neighbouring lateral parts convex, antenna inserted below ocular line, clava with a large micropilosity area on segments C1–C4, median area of propodeum concave, fore wing narrow.

Palaearctic species of the sequester group of Pteromalus Swederus, 1795 are reviewed. Three new species, P. boleensis Yan, Li & Tselikh, sp. nov. (Kazakhstan, China), P. longipedicellus Yan, Li & Tselikh, sp. nov. (China) and P. oscolensis Tselikh, sp. nov. (Russia, China) are described and illustrated. Types of P. cionobia (Erdös, 1953) and P. sequester Walker, 1835 are redescribed. An identification key to females of the sequester group of Pteromalus is given.