Three new species of Lygistorrhina (Probolaeus) Williston, 1896 are described, Lygistorrhina maculipennis n. sp., Lygistorrhina conica n. sp. and Lygistorrhina mitarakensis n. sp. The material was collected mainly by Malaise and SLAM traps in Mitaraka, southwestern French Guiana, during the “Our Planet Revisited” expedition in 2015. Lygistorrhina cerqueirai Lane, 1958 and Lygistorrhina urichi Edwards, 1912 are illustrated and their descriptions emended. A key to all known species of the subgenus Lygistorrhina (Probolaeus) is provided.
Neotropics, Amazon basin, Malaise trap, SLAM, fungus gnats, new species