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 notopleuralis Spencer ( Figs. 58 , 84 ) Material examined. MASSACHUSETTS : Berkshire Co. , Great Barrington , 42.197870 , -73.335897 , 17.ix.2017 , em. ~ 16.iv.2018 , C.S. Eiseman , ex Cornus sericea , # CSE4416 , CNC1144083–1144084 (1♁ 1♀ ) . Host. * Cornaceae : Cornus sericea L. Leaf mine. ( Fig. 84 ) Entirely linear, on the upper leaf surface; frass in somewhat liquidy strips along the sides. Puparium. Shining dark brown with paler brown intersegmental boundaries; formed outside the mine. Phenology and voltinism. Our specimens were collected as larvae in mid-September and emerged as adults the following spring. There is presumably at least one earlier generation; the only other known specimens were collected as adults on 3 June ( Ontario ) and 9 July ( Michigan ) ( Spencer 1969 ; Spencer & Steyskal 1986 ). Distribution. USA : *MA, MI; Canada : ON ( Spencer & Steyskal 1986 ). Comments. Neither Spencer (1969) nor Spencer & Steyskal (1986) made any statements about the possible relationships of Phytomyza notopleuralis to other Phytomyza . Winkler et al . (2009) indicated that it is near P. spinaciae Hendel , a Palearctic species mining leaves of Cynareae (Asteraceae) and forming a white puparium within the leaf, and placed it in the syngenesiae group. However, the leaf mine is identical with that of P. agromyzina Meigen , which feeds on various dogwoods including Cornus sericea , and the younger P. notopleuralis may eventually prove to be its junior synonym. External morphology is nearly identical, excluding the presence of a strongly pale yellow notopleuron in P. notopleuralis ( Fig. 58 ) (yellowish tint with margins yellower in P. agromyzina ), and the genitalia ( Spencer 1969 : Fig. 470) only differ in that the distiphallus of P. agromyzina is basally straight (not shallowly curved) and sometimes slightly abbreviated; the apex of the distiphallus is also sometimes a bit straighter. The phallus of P. agromyzina illustrated in Spencer (1969 : Fig. 395) shows the distiphallus as a simple membranous lobe without the narrow, apically forked and medially deviated sclerotized band; this is apparently an artifact of illustration, as this structure is present in all dissected material examined at the CNC.