First data on Dolichopodidae (Diptera) of the West Kotlin Nature Reserve (Saint Petersburg, Russia)

First data on Dolichopodidae from the West Kotlin Nature Reserve resulted from the short-term visit (June, 2017) are presented. All 25 collected species are firstly recorded for the Kotlin Island. Lamprochromus semiflavus (Strobl, 1880) and Syntormon filiger Verrall, 1912 are new species for the Leningrad Region and Saint Petersburg. The old records of Lamprochromus bifasciatus (Macquart, 1827) and Syntormon pumilus (Meigen, 1824) from the Region are doubted.