Thirty-seven species of fungus gnats new to Finland are reported. Eleven of these are reported in Fennoscandia for the first time: Diadocidia fissa Zaitzev, Macrocera estonica Landrock, M. nigricoxa Winnertz, M. pusilla Meigen, Boletina pallidula Edwards, Mycetophila morata Zaitzev, M. ostentanea Zaitzev, Trichonta nigritula Edwards, T. subterminalis Zaitzev & Menzel, Neoempheria winnertzi Edwards and Neuratelia sintenisi Lackschewitz. The records are based on original material collected in large-scale trapping projects in Southern and Eastern Finland mainly in old-growth forests during 1997–1998. Detailed information on Finnish findings, and data on the general distribution of the species are given. Several species are known with only one (typematerial) or a few previous records ranging from Norway to Sakhalin. For two poorly-known species, Neuratelia sintenisi Lackschewitz and Rymosia pinnata Ostroverkhova, new figures of male genitalia are presented.

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Nine new species of the fungus-gnat genus Boletina Winnertz (B. falcata sp. n., B. hedstroemi sp. n., B. struthioides sp. n., B. kivachiana sp. n., B. fennoscandica sp. n., B. lapponica sp. n., B. subtriangularis sp. n., B. atridentata sp. n. and B. cordata sp. n.) are described from Russian Karelia, Finland and Sweden. The descriptions are based on recently collected specimens as well as on the old material deposited in the collection of the Museum of Natural History, Helsinki, Finland. Most of the collecting localities are situated in oldgrowth reservations or habitats suggested to protection. Detailed descriptions and illustrations of genitalia are given. Ecological data and information on closely related species are provided.

Limoniidae is one of the most species-rich Dipteran families, with 661 reported species in Europe. Despite the fact that the European limoniid crane fly fauna has been studied ever since Carolus Linnaeus, it is still poorly known. In this study, we summarise the taxonomic and faunistic studies of European Limoniidae, which described new species and reported first country records, between 2010 and 2020. We also report occurrence data of 244 Limoniidae species which represent the first country records or conformational records from various European countries, as we report ten species from Albania, one from Austria, thirty-seven from Belarus, five from Belgium, two from Bulgaria, two from Estonia, six from Finland, seven from France, fourteen from Greece, sixteen from Hungary, two from Iceland, six from Italy, ten from Latvia, one from Malta, nine from Montenegro, two from The Netherlands, ten from North Macedonia, forty-two from Norway, one from Poland, five from Portugal, twenty from Romania, thirty-eight from Serbia, six from Slovenia, five from Spain and seven species from Sweden for the first time. From the European territory of Russia, we report twenty-eight species from Central European Russia, seventy-two from East European Russia, fifteen from North European Russia, one from Northwest European Russia and seven from North Caucasus for the first time. Confirmatory records and corrigenda are also included.

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New faunistic data on fungus gnats (Diptera: Sciaroidea excluding Sciaridae) from Finland and NW Russia (Karelia and Murmansk Region) are presented. A total of 64 and 34 species are reported for the first time form Finland and Russian Karelia, respectively. Nine of the species are also new for the European fauna: Mycomya shewelli Väisänen, 1984, Mycomya thula Väisänen, 1984, Acnemia trifida Zaitzev, 1982, Coelosia gracilis Johannsen, 1912, Orfelia krivosheinae Zaitzev, 1994, Mycetophila biformis Maximova, 2002, Mycetophila monstera Maximova, 2002, Mycetophila uschaica Subbotina & Maximova, 2011 and Trichonta palustris Maximova, 2002.

BackgroundIn 2016, saproxylic Diptera associated with aspen (Populus tremula L.) logs were studied in the Kivach Nature Reserve, Russian Karelia, using trunk emergence traps.New informationEleven rare species of Diptera (families Limoniidae, Scatopsidae, Axymyiidae, Mycetophilidae, Sciaridae, Platypezidae, Syrphidae and Clusiidae) with poorly known distribution and ecology were recorded. For each species, basic diagnostic characteristics were provided along with the information on microhabitats. An attempt was also undertaken to outline possible associations with wood-decaying macrofungi using nonparametric correlation.

A new Palaearctic species, Boletina palmata sp. nov., is described, and three other species, B. kurilensis Zaitzev, B. jamalensis Zaitzev and B. pinusia Maximova, are redescribed. It is demonstrated that many specimens from Fennoscandia formerly identified as B. kurilensis belong to B. palmata, while true B. kurilensis occurs only in northern parts of Murmansk Province in Russia, northern Norway and northern Finland. European specimens previously identified as B. jamalensis are proved to belong to B. pinusia, while another closely-related species, B. struthioides Polevoi et Hedmark, is found to be a junior synonym of B. jamalensis.