Thirteen new species of Agromyzidae (Diptera) from the United States, with new host and distribution records for 32 additional species Author Eiseman, Charles S. Author Lonsdale, Owen 0000-0001-7034-3330 onsdale@agr.gc.ca Author Linden, John Van Der 0000-0003-2651-0634 johnbvdl@gmail.com Author Feldman, Tracy S. 0000-0001-5939-6810 feldmants@sa.edu Author Palmer, Michael W. 0000-0003-1452-2152 mike.palmer@okstate.edu text Zootaxa 2021 2021-02-17 4931 1 1 68 journal article 7424 10.11646/zootaxa.4931.1.1 d63cab47-63f1-4fdc-9209-26a256c91ccb 1175-5326 4545337 88CF2B0D-E02B-46E1-9F52-1B95F717FC8F Ophiomyia cf. chondrillae Spencer Material examined. IOWA : Allamakee Co. , 5.ix.2017 , em. spring 2018, J. van der Linden , ex Lactuca , # CSE4671 , CNC1135659–1135660 (1♁ 1♀ ) . Hosts. Asteraceae : Chondrilla juncea L. ( Spencer & Steyskal 1986 ), * Lactuca L. Larval mine. An externally visible stem mine. Puparium. Details not recorded by either Spencer & Steyskal (1986) or us, but we believe the puparium was not covered by a “scab” as described in the Comments under Melanagromyza sp. 2. Phenology and voltinism. The holotype of O. chondrillae , from Washington , is labeled with a date of 11 July ; whether this was the collection or emergence date was not stated, but there are evidently at least two generations since our Iowa specimens emerged in spring from stems collected in early September . Distribution. USA : *IA, WA ( Spencer & Steyskal 1986 ). Comments. Ophiomyia chondrillae was described from a single specimen in poor condition ( Spencer & Steyskal 1986 ), which we have not examined, but our specimens key readily to this species in Spencer & Steyskal (1986) . The morphology of the flies reared from Lactuca seems to fit this species, and we suspect that slight differences in genitalic morphology compared to the original illustrations are due to error or a difference in the angle in which the phallus was illustrated. Given this, and the fact that the host is in the same tribe ( Cichorieae ) as that of the holotype , we choose to regard them as conspecific until we can examine specimens reared from Chondrilla .