Abstract
The faunal composition of Diptera (Insecta) inhabiting the galleries of Polygraphus proximus over the territory of Siberia and the Russian Far East was studied. As a result, 14 species of Diptera were discovered representing 8 families. Within its secondary range, the invasive beetle P. proximus Blandford, 1894 is affected not only by the well-known introduced species Medetera penicillata Negrobov, 1970 but also by numerous other widespread predatory flies, such as Medetera excellens Frey, 1909, M. pinicola Kowarz, 1877, Xylophagus cinctus (De Geer, 1776), and Toxoneura ephippium (Zettersted, 1860). Four predatory fly species, M. penicillata, M. signaticornis Loew, 1857, Lonchaea bukowskii Czerny, 1934, and Xylophagus sachalinensis (Pleske, 1925), affect P. proximus within its native range in the Russian Far East. Data on the predation of each species of Diptera on several species of bark beetles testify to their polyphagy. Saprophagous larvae of Dicranomyia modesta (Meigen, 1818), Chalcosyrphus piger (Fabricius, 1794), Xylosciara lignicola (Winnertz, 1867), and Pseudolycoriella unispina (Mohrig et Krivosheina, 1983) were discovered in bark beetle galleries for the first time.
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