Том 102, № 3 (2023)

The studies were carried out in crops of alfalfa ( Medicago sativa ssp. × varia ) in 2018-2022 in the forest-steppe of Samara Province. Asphondylia miki galls were taken into account in alfalfa crops from the beginning of their formation to the end of the growing season on sites from 0.1 to 1 m² in 10-fold repetition. Statistical processing of the obtained data was carried out by methods of variance analysis. At spring sowing of alfalfa, as well as in its perennial crops, gall midge A. miki develops in two, and during summer sowing in the rst year of the culture’s life in one generation per year, pupae overwinter in galls, the imago of the wintering generation occurs in April. The greatest damage to alfalfa by the larvae of A. miki (40-68% of generative shoots) and the number of its galls (500-830 copies/m²) were observed in the rst year of the culture’s life when it was sown in summer, with the coincidence of the greatest ight of imago with the budding of the culture, which led to signi cant losses in the yield of alfalfa seeds (13-81%). In summer alfalfa crops of the rst year of development without the use of chemical plant protection agents, parasitic hymenopterans contribute to the death of larvae and pupae of A. miki in on average 60% of its galls. Among them, a gregarious ectoparasite Sigmophora brevicornis (Eulophidae) mainly preying on A. miki larvae accounted for about 77% of the individuals of the identi ed parasites. In the S. brevicornis population, males and females had similar body coloration and belonged to three phenotypes: the lightest brownish yellow, yellowish brown, and dark coloration, which accounted for 53, 28 and 19% of parasite individuals, respectively.

The paper presents the results of a study of the fungal component of the microbiome associated with six-toothed bark beetle on the territory of Belarus to clarify the role of this xylophage as a vector of dangerous phytopathogenic fungi. More than 360 pure cultures of fungi isolated from the surface and hemocoel of Ips sexdentatus were analyzed by cultural-morphological and molecular-genetic methods. 35 species of fungi from 25 genera of 17 families in 3 divisions were identi ed. Based on their impact on the stored wood, all species are conventionally classi ed into three groups: (1) fungi that cause discoloration of wood (mold, blue stain, etc.), (2) fungi that cause rot of growing forest and harvested wood, and (3) fungi whose . Five species of fungi from the family Ophiostomatacea e were identi ed: Leptographium Lagerb. & Melin sp., Ophiostoma ips (Rumbold) Nannf., O. minus (Hedgc.) Syd. & P. Syd., O. canum (Münch) Syd. & P. Syd., and O. piceae (Münch) Syd. & P. Syd. associated with blue wood. Heterobasidion annosum (Fr.) Bref. was found in 7.8% of the studied samples of the fungal ora. Fairly high frequency of occurrence con rms the participation of the six-toothed bark beetle in the formation of complex centres of pine desiccation in the territory of Belarus. In the I. sexdentatus population, a signi cant proportion of entomopathogenic fungi (11.4%) was recorded using the molecular genetic method, which may indicate natural processes of self-regulation, or the attenuation of the outbreak of bark beetles in Belarus.

Two species of the tribe Idiocerini (Cicadellidae, Eurymelinae), Theronopus spicatus (Webb, 1976) and Kopamerra truncata (Webb, 1975), are recorded for the rst time from Sudan. The species were collected in Kassala Province of Eastern Sudan.

Two species of false click-beetles, Microrhagus pyrenaeus Bonvouloir, 1872 and Hylis simonae (Olexa, 1970), previously considered endemic to Central and South Europe, are reported from Russia for the rst time based on specimens collected in Krasnodar Territory.

Oulema duftschmidi (Redtenbacher, 1874), Phyllotreta astrachanica Lopatin, 1977 and Ph. procera (Redtenbacher, 1849) are recorded for the rst time for Uzbekistan; Longitarsus stragulatus dichrous Khnzorian, 1962 is recorded for the rst time for Tajikistan. The geographic distribution of Acolastus pallidus (Lopatin, 1958) and Aphilenia ornata Reitter, 1889 has been clari ed. For all the taxa considered, images of the adult habitus and male genitalia (for some of them) are given.

A new species Diplocolenus ( Verdanulus ) stepposus sp. n. with a Ponto-Kazakhstanian steppe distribution is described. The species is monophagous on the Volga fescue, Festuca valesiaca . Arguments in support of the distinctness of the subgenus Verdanulus are given. Some morphological transformations of the male genitalia in the genus Diplocolenus as a whole are discussed. Two independent immigrations of the subgenera Diplocolenus s. str. and Verdanus Oman into the Nearctic in di erent times are hypothesized.

A new genus Magneclava gen. n. with the type species Magneclava sergeyi sp. n. is described from South Korea. The new genus is similar to Psilocera Walker, 1833, from which it may be distinguished by a very large antennal clava, longer than F1-F6 combined; lower margin of clypeus with angulate medial tooth; notauli of mesosoma complete and shallow, and propodeum without costula and median transverse carinae.

A catalog of types (holotypes, paratypes, lectotypes, paralectotypes) of species of the family Xylophagidae (Diptera) described by Th. Pleske, N. P. Krivosheina and B. M. Mamaev, and by V. G. Kovalev, which are stored in the collection of the Zoological Institute of the Russian Academy of Sciences in St. Petersburg, is presented. Photographs of the holotypes and lectotypes and of their labels are given.