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 Phytomyza thermarum (Griffiths) ( Fig. 85 ) Material examined. VERMONT : Windham Co. , Marlboro , Hogback Mountain , 42.852158 , -72.797828 , 21.vi.2018 , em. 4.vii.2018 , C.S. Eiseman , ex Erigeron pulchellus , # CSE4720 , CNC1135661 (1♁). Hosts. Asteraceae : Erigeron philadelphicus L. ( Griffiths 1976 ), E. * pulchellus Michx. Larval mine. ( Fig. 85 ) Partly in the stem, petiole, and basal part of the leaf midrib, with whitish linear channels radiating into the blade. These channels are mostly more or less full-depth but may be on the upper or lower surface. Frass is mostly in discrete grains (partly forming beaded strips in most mines according to Griffiths (1976)) . Puparium. White or yellowish-white, formed within the mine, either in the petiole or on the lower surface of the blade, with its anterior spiracles projecting ventrally through the epidermis ( Griffiths 1976 ). Phenology and voltinism. This species is evidently multivoltine in western Canada , with larvae collected in early June emerging as adults within two weeks, larvae and puparia collected in mid-July emerging as adults in late July and early August, and those collected in early September emerging as adults within a month ( Griffiths 1976 ). Distribution. * USA : VT; Canada : AB, BC ( Griffiths 1976 ). Mines possibly representing this species have been found on Erigeron philadelphicus in PA ( Schultz 2020 ).