Metopomyza interfrontalis (Melander)

Lonsdale, Owen, 2021, Manual of North American Agromyzidae (Diptera, Schizophora), with revision of the fauna of the " Delmarva " states, ZooKeys 1051, pp. 1-481: 1

publication ID

publication LSID

persistent identifier

treatment provided by

ZooKeys by Pensoft

scientific name

Metopomyza interfrontalis (Melander)


Metopomyza interfrontalis (Melander)  

Figs 118 View Figures 116–123 , 119 View Figures 116–123 , 653-659 View Figures 653–659

Agromyza interfrontalis   Melander, 1913: 263.

Liriomyza xanthaspida   Hendel, 1920: 144. Spencer 1981 [synonymy].

Liriomyza (Haplomyza) xanthaspida   . Hendel, 1931: 263.

Liriomyza interfrontalis   . Frick, 1952: 403.

Metopomyza interfrontalis   . Frick, 1959: 412. Spencer 1969: 198, 1981: 333; Spencer and Steyskal 1986b: 161; Zlobin 1995: 152.


(Figs 118 View Figures 116–123 , 119 View Figures 116–123 , 653 View Figures 653–659 ). Wing length 1.4-1.8 mm (♂), 1.8-2.2 mm (♀). Length of ultimate section of vein M4 divided by penultimate section: 2.0-3.5. Costa ending at vein M (ending at R4+5 in some Metopomyza   ). Eye height divided by gena height: 3.1-4.0. First flagellomere slightly longer than high with anterodistal margin pointed, with point reduced to pronounced. Ocellar triangle rounded, barely larger than tubercle. Cheek weakly developed. Thorax with light pruinosity, but usually more matt; venter of pleuron shiny.

Chaetotaxy: Two to three ori; two ors; decreasing in size anteriorly. Orbital setulae well-developed, densely clustered anteriorly. Postocellar and ocellar setae slender, as long as ors. Three dorsocentrals, decreasing in length anteriorly, sometimes with much smaller fourth sutural to presutural dorsocentral. Acrostichal setulae in four irregular rows.

Colouration: Head brown with face (shiny medially) slightly darker, clypeus dark brown, and postgena and gena light brown with lower margin of gena dark and shiny; frons soft and yellowish brown to light brown with fronto-orbital plate (narrowing anteriorly), posterior margin and ocellar triangle dark brown. Scutum dark brown with wide yellow stripe on scutellum, and with notopleuron, postpronotum and supra-alar region slightly paler. Calypter hairs light brown, margin narrowly light brown. Legs dark brown with apices of femora yellow with spots on mid and hind femora sometimes reduced. Abdomen brown, tergites 1-5 uncommonly yellow laterally.

Genitalia: (Figs 654-659 View Figures 653–659 ) Epandrium slightly produced and narrowed ventrally; with numerous tubercle-like setae on inner-medial ridge and along inner-distal margin, forming two dense, irregular comb-like rows; posterior margin ventral to cerci with several tubercle-like setae placed irregularly. Cercus very narrow and slender, with few short setae. Surstylus positioned and directed anteriorly, apex broadly rounded, free from epandrium; with several stout apical setae and one tubercle-like seta. Subepandrial sclerite broad and plate-like with dorsal region thicker and with one pair of short, ill-defined lateral arms, venter shallowly bilobed medially. Hypandrial lobe well-developed, with one seta; with pronounced anterobasal extension. Postgonite rounded apically, bare, with several sockets anteriorly, posteriorly split. Phallophorus slightly elongate and narrow. Basiphallus flat, dorsally confluent with phallophorus, apically split. Hypophallus broad, flat; lateral margins sclerotised and with inner-medial process. Paraphalli forming broad membranous leaf-like plates. Mesophallus cylindrical, constricted medially, length 2 × width. Distiphallus bifid with weak connection between halves and apex flared; sclerotised medially; slightly longer than basiphallus. Ejaculatory apodeme with abbreviated base, narrow stem that continues onto pale blade as sublateral rib; blade marginally striated; sperm pump clear.


Unknown - possibly Cyperaceae  or Poaceae  ( Spencer and Steyskal 1986b).


Canada: AB, BC, MB, NL, NT, NU, ON, QC, YT*. USA: AK, CA, CO*, CT*, ID*, IL, KS, MA*, MI, MO*, NH*, NY*, OR, TX, VA, WA. Europe. Russia.

Type material.

Holotype [interfrontalis]: USA: DC: Washington (1♀, USNM).

Syntypes [ Liriomyza xanthaspida   ]: Germany: “Germ.” (1♂ 1♀, NMW). [Not examined]

Additional material examined.

Canada. AB: Bilby ,, O. Bryant (1♀, USNM), BC: Ketchum L., 58°22'N, 131°45'W, 23.viii.1960, W.W. Moss, CNC391602 (1♂, CNC), Kinbasket Lake ,, Cooper Beauchesne and Assoc. Ltd., CNC391604 (1♂, CNC), Toad R. Lodge, Mi422, Alaska Hwy, 1371 m, 20.vii.1959, E.E. MacDougall, CNC481025 (1♀, CNC), MB: Aweme,, N. Criddle, CNC391576 (1♂, CNC), 24.viii.1917, CNC391580 (1♀, CNC), Churchill, 58°46'N, 94°10'W, 17.viii.1952, J.G. Chillcott, Ecological data f-C, CNC_ Diptera 59194 (1 ex, CNC), Farnworth Lake , near Churchill, 58°41'N, 94°3'W,, J.G. Chillcott, Ecological data F-B, CNC_ Diptera 97098 (1♂, CNC), Fort Churchill , 58°46'N, 94°10'W,, J.G. Chillcott, Ecological data T-B 12, CNC_ Diptera 59199 (1 ex, CNC),, Ecological data F-B 12, CNC_ Diptera 97094 (1 ex, CNC), 11.vii.1952, Ecological data F-D 21, F-E 21, CNC_ Diptera 59201, CNC_ Diptera 97097, CNC_ Diptera 59202 (1♂ 2 ex, CNC),, Ecological data F-B 12, T-D 18, CNC_ Diptera 97088, CNC_ Diptera 97090, CNC_ Diptera 97095, CNC_ Diptera 59195-59197 (7 ex, CNC),, Ecological data T-G 11, CNC_ Diptera 97091 (1 ex, CNC),, Ecological data T-C 18, CNC_ Diptera 59200, CNC_ Diptera 97092 (2 ex, CNC),, Ecological data F-B 12, F-B 12, CNC_ Diptera 97087, CNC_ Diptera 97089, CNC_ Diptera 59193 (3 ex, CNC), 5.viii.1952, Ecological data F-B 12, CNC_ Diptera 97095 (1 ex, CNC), 15.vii.1949, L.A. Miller, CNC_ Diptera 97093 (1 ex, CNC), Mile 505, Hudson Bay Ry., J.G. Chillcott, 13.v.1952, Biological data F-D, CNC391575 (1♂, CNC), NL: Labrador, Cartwright,, E.E. Sterns, CNC391569 (1♂, CNC), Jack’s Pond, 75',, C.P. Alexander (1♂, USNM), Terra Nova N.P., 6.vii.1961, C.P. Alexander (1♂, USNM), Gander,, C.P. Alexander (1♂, USNM), Lomond,, C.P. Alexander (1♀, USNM), NT: Salmita Mines, 64°5'N, 111°15'W, 8.vii.1953, J.G. Chillcott, CNC391598 (1♂, CNC), Yellowknife,, J.G. Chillcott, CNC391599, CNC391600 (2♂, CNC), NS: Smith's Cave , 6.viii.1925, A. Gibson, CNC391581 (1♀, CNC), NU: N.W.T., Muskox Lake , 64°45'N, 108°10'W,, J.G. Chillcott, CNC391596, CNC391597 (2♂, CNC),, CNC391585 (1♀, CNC), ON: Britannia,, G.E. Shewell, CNC391582 (1♀, CNC), Mer Bleue, 23.v.2015, O. Lonsdale, CNC440465(1♀, CNC), Normandale, 42°42'N, 80°19'W,, J.R. Vockeroth, CNC391574 (1♂, CNC), 24.v.1956, CNC391573(1♂, CNC), Ottawa,, J.G. Chillcott, CNC391571(1♂, CNC),, CNC391572(1♂, CNC), 20.vii.1954, J.R. Vockeroth, CNC391586 (1♀, CNC), 20.vii.1959, CNC391570 (1♂, CNC), Perth Road, 28.vii.1964, J.R. Vockeroth, CNC391603 (1♂, CNC), QC: Fort Chimo , 2.vii.1954, W.R. Richards, CNC391583 (1♀, CNC), Mi 139, Rte 58, La Verendrye Prov. Pk.,, D.M. Wood, CNC391567 (1♂, CNC), Mistassini   , Mistassini   Post, 50°25'N, 73°53'W, 7.vii.1956, J.R. McGillis, CNC391584 (1♀, CNC), Port Chimo , 2.vii.1954, W.R. Richards, CNC391568 (1♂, CNC), YT: North Fork Pass , Ogilvie Mts.,, R.E. Leech, CNC391590 (1♀, CNC), Otter Lake, 62°30'N, 130°25'W, 17.vii.1960, J.E.H. Martin, CNC391587 (1♀, CNC) GoogleMaps   . Sweden. T. Ipm., Maunu , starr på torvmosse [=sedge peat moss], nr 64, CNC391605, CNC391606 (1♂ 1♀, CNC)   . USA. AK: Unalakleet , 19.vii.1961, B.S. Heming, CNC391589 (1♀, CNC),, R. Madge, CNC391577, CNC391595 (2♂, CNC),, CNC391578, CNC391579, CNC391601 (3♂, CNC), Umiat, 8.vii.1959, R. Madge, CNC391591 (1♀, CNC), CO: Nederland, 3mi N, 2.vii.1961, J.G. Chillcott, CNC391588 (1♀, CNC), CT: Putnam Park, 18.vii.1939, A.L. Melander (1♂ 1♀, USNM), ID: Chateolet, viii.1915, A.L. Melander (1♂, USNM), IL: Savanna, 9.vii.1917, J.M. Aldrich (1♂, USNM), Champaign Co., 12.vii.1925, M.W. Shackleford, CNC391592 (1♀, CNC), 19.vii.1925, CNC391593 (1♀, CNC), 26.vii.1925, CNC391594 (1♀, CNC), KS: Manhattan ,, C.W. Sabrosky, MA: Bedford , 20.vii.1961, swamp, W.W. Wirth (1♂, USNM), Concord , 27.vii.1961, marshy pond, W.W. Wirth (1♂ 2♀, USNM), MI: St. Joseph , 30.v.1938, C.W. Sabrosky (2♀, USNM), MO: Columbia , 7.viii.1968, Malaise, F.D. Parker (1♂, USNM), Boone Co. , Columbia , 16-31.vii.1968, Malaise trap, F.D. Parker (1♂, USNM), NH: Stinson Lake , 23.vii.1961, W.W. Wirth (1?, USNM), NY: Allegany State park ,, stream margin, W.W. Wirth (1♂ 2♀, USNM), Chautauqua Co. , S. Dayton,, marsh area, W.W. Wirth (1♂, USNM), OR: Lane Co. , 8mi S Florence,, G. Steyskal (1♂, USNM), TX: Sonora Exp. Sta., 23.iii.1955, W.W. Wirth (1♂, USNM), VA: Dead Run ,, W.L. McAtee (1♀, USNM), Chain Bridge , 10.ix.1922, J.R. Malloch (1♀, USNM), Montgomery Co. , Pandapas Pond , 37°16'30N, 80°28'00W, 14.v.2001, O. Lonsdale (1♀, USNM), WA: Mt. Consititution, Orcas Id., 7.vii.1905, J.M. Aldrich (1♀, USNM) GoogleMaps   .














Metopomyza interfrontalis (Melander)

Lonsdale, Owen 2021

Liriomyza xanthaspida

Hendel 1920

Liriomyza (Haplomyza) xanthaspida

Hendel 1920

Agromyza interfrontalis

Melander 1913