A New Species of Harmandia (Diptera: Cecidomyiidae) Damaging Leaves of Allegheny Chinkapin in Eastern United States and a Redescription of the Genus

A new species of gall midge, Harmandia amisae (Diptera: Cecidomyiidae), is described and illustrated. It infests leaves of Allegheny chinkapin, Castanea pumila (L.) Mill. (Fagaceae), in eastern North America. The genus Harmandia is redescribed and distinguished from Macrodiplosis, a genus restricted to oaks. The American species formerly and currently placed in Harmandia are reviewed. “Cecidomyia” castaneae Stebbins is newly combined with Harmandia. Harmandia reflexa (Felt) is considered a junior synonym of Harmandia hudsoni (Felt). The new species is distinguished from its other American congeners on Populus and Castanea.