A new Nearctic species of the fungus gnat genus Tetragoneura Winnertz, 1846 and notes on Tetragoneura nitida Adams, 1903 (Diptera, Mycetophilidae).

A new Nearctic species of the fungus gnat genus Tetragoneura Winnertz, 1846 was discovered in western Michigan, USA. More than 100 males and seven females of Tetragoneura lustra spec. nov. flew to a Malaise trap over the course of several years in an ecotone between swamp and second-growth forest. The new species resembles published accounts of Tetragoneura nitida Adams, 1903, which is relegated
herein to the status of nomen dubium. Juvenile stages of T. lustra are unknown.