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 Cerodontha (Dizygomyza) morosa (Meigen) Material examined. OKLAHOMA : Payne Co. , Mehan , 36.013839°, -96.998103°, 20.xii.2017 , em. 12.ii.2018 , M.W. Palmer , ex Carex amphibola , # CSE4377 , CNC1135648 ( 1♀ ) Hosts. Cyperaceae : [ Carex * amphibola Steud. , C. festucacea Willd. ], C. gracillima Schwein. , C. hitchcockiana Dewey , C. leptonervia (Fernald) Fernald ( Eiseman & Lonsdale 2018 ) . Leaf mine. A long, whitish corridor, changing direction a few times, with frass in a single blackish lump toward the leaf apex. Puparium. Yellowish or reddish to blackish-brown; formed within the mine, glued to the floor toward the base of the leaf. Phenology and voltinism. In Massachusetts , Cerodontha morosa has been reared in late June and early July from leaf mines collected in June. In Oklahoma , tentatively identified females have been reared from overwintering pupae, and from mines collected in early and late May with adults emerging in early May and early June ( Eiseman & Lonsdale 2018 ). Distribution. USA : CA, MA, MO ( Spencer 1981 ), [OK]; records from IL, IN, MD, MI ( Priest et al. 2020 ), and SD require verification; Europe ( Eiseman & Lonsdale 2018 ). The Montana record given by Spencer & Steyskal (1986) and repeated by Eiseman & Lonsdale (2018) was evidently an erroneous substitution for the Missouri record given by Spencer (1981) . Comments. This is the first record of an agromyzid from Carex amphibola .