Abstract
The Nearctic species of Ditomyia Winnertz (Diptera: Ditomyiidae) are revised and four species are recognized: D. euzona Loew and D. potomaca Fisher from the eastern Nearctic and D. sohnsi n. sp. and D. elongata n. sp. from the western Nearctic. All species are figured and a key provided. Additionally, the first known Neotropical Ditomyia is described and the generic limits of Ditomyia discussed.
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