We present novel rearing records of Agromyzidae (Diptera) from throughout the United States. We describe leaf mines or other larval habits for 14 species, plus three others that could not be confidently identified in the absence of male specimens. We review host and distribution data for the known species, reporting 14 new host species records (including the first rearing records for Cerodontha (Dizygomyza) magnicornis (Loew)) and 12 new state records (including the first USA record for Phytomyza prava Spencer). We also describe and provide natural history information for the following ten new species: Agromyza princei, Melanagromyza vanderlindeni, Ophiomyia antennariae, O. osmorhizae, Calycomyza smallanthi, Liriomyza euphorbiella, L. garryae, L. phloxiphaga, Phytomyza nemophilae, and P. salviarum.
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