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The 11 Nearctic species of the subgenera Thyridomyia and Synthyridomyia of the genus Forcipomyia are described and illustrated. Three species are new: floridensis from Florida, sinuosa from Sinaloa, Mexico, and tenuichela from California. F. aspinosa Saunders is a synonym of frutetorum (Winnertz), F. hirta Lundstrom and palustris Saunders are synonyms of monilicornis (Coquillett), F. abludens Remm is a synonym of knockensis Goetghebuer, and F. moascari Macfie is a synonym of murina (Winnertz) (NEW SYNONYMIES).
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Dow et al. (1972) studied this question.
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