Melanagromyza buccalis Spencer, 1969

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

Melanagromyza buccalis Spencer

Figs 52 , 53 , 264-268

Melanagromyza buccalis Spencer, 1969: 67. Spencer and Steyskal 1986b: 243; Shi and Gaimari 2015: 10; Eiseman and Lonsdale 2018: 17.

Description

(Figs 52 , 53 ). Wing length 1.9-2.4 mm (♂), 2.2-2.5 mm (♀). Length of ultimate section of vein M4 divided by penultimate section: 0.6-0.9. Eye height divided by gena height: 3.9-5.6. Gena relatively broad and curved anteriorly with highest point anterior to midpoint of eye. Clypeus slightly truncated to rounded anteromedially. Face with narrow, shallow ridge. Fronto-orbital plate sometimes slightly to moderately swollen medially, narrowed anteriorly and with setae slightly inset (similar to species in M. virens group). Ocellar triangle short, nearly equilateral and with anterior point open.

Chaetotaxy: Two to four ori, but if only two ori, then ori sometimes widely spaced as in M. virens group; two ors. Orbital setulae short, in two to three irregular rows, erect to reclinate with inner row partially inclinate. Eye pilose dorsomedially. Two dorsocentral setae. Acrostichal setulae in eight irregular rows. Mid tibia with two posteromedial setae.

Colouration: Body, including halter, dark brown in base colour. Ocellar triangle and fronto-orbital plate sometimes light brown. Scutum brown with sometimes indistinct greenish shine. Calypter margin and hairs white. Abdomen metallic green, or less commonly, coppery-green.

Genitalia: (Figs 264-268 ) Epandrium with small posterodistal spine. Metepiphallus with several clustered spine-like ventral projections and numerous narrow lateral ridges. Proepiphallus V-shaped. Basiphallus U-shaped. Distiphallus separated from phallophorus by slightly less than length of basiphallus; base of distiphallus and mesophallus level; distiphallus narrow, long, with sides parallel, with short, thick dorsomedial lobe, and one pair of internal spinulose patches; distolateral plate forming conspicuous, dark oblique band. Ejaculatory apodeme subovate with stem reduced and margin clear.

Host.

Unknown, but Spencer and Steyskal (1986b) speculated Asteraceae , and Shi and Gaimari (2015) reported one instance of rearing from an unknown legume in California; some adults collected around a variety of families including Apiaceae , Salicaceae , Rutaceae , Hydrangeaceae , Rosaceae and Asteraceae ( Shi and Gaimari 2015; Eiseman and Lonsdale 2018), and Baccharis ( Asteraceae ) from Maryland.

Distribution.

Canada: MB*, NB*, ON, QC. USA: AZ, CA, CO, DE*, GA*, IA*, IL*, IN*, MA, MD, MO, NC*, NH*, NJ*, NM*, NY, PA*, TN*, VA, WV*.

Type material.

Holotype: Canada. QC: Lake Bernard, 7.viii.1938, G.E. Shewell, CNC258290 (1♂, CNC).

Paratypes: Canada. NS: Truro, 8.vii.1913, CNC Type No. 10360, CNC358296 (1♂, CNC), ON: Mer Bleue, 3.vi.1938, A.R. Brooks, CNC358295 (1♂, CNC), Osgoode, 18.vi.1964, J.R. Vockeroth, CNC358292, CNC358322 (1♂,1♀, CNC), Ottawa, 2mi E, Cyrville Road, 31.v.1965, B.V. Peterson, CNC358321 (1♀, CNC), Ottawa, CEF, on larch, 3.viii.1962, J.F. McAlpine, CNC358302 (1♂, CNC), Ottawa, 20.vi.1954, D. Cobb, CNC358298, CNC358303, CNC358305, CNC358309, CNC358312 (5♂, CNC), 25.viii.1908, J.M. Fletcher, CNC358299 (1♂, CNC), 7.x.1947, G.E. Shewell, CNC358307 (1♂, CNC), 9.vi.1962, J.R. Vockeroth, CNC358300, CNC358311 (2♂, CNC), Simcoe, 15.vi.1939, G.E. Shewell, CNC358301 (1♂, CNC), 19.vi.1939, CNC358319 (1♀, CNC), 20.vi.1939, CNC358310 (1♂, CNC), 22.vi.1939, CNC358308 (1♂, CNC), 23.vi.1939, CNC358320 (1♀, CNC), 4.vi.1939, CNC358306 (1♂, CNC), Spencerville, 14.viii.1939, Hammond, en copulae, CNC358316 (2♂♀, CNC), QC: Wakefield, 20.vi.1946, G.S. Walley, CNC358291 (1♂, CNC), Abbotsford, 22.vi.1937, G. Shewell, CNC358293 (1♂, CNC), Hull, 25.ix.1923, C.H. Curran, CNC358294 (1♂, CNC), Knowlton, 1.viii.1929, L.J. Milne, en copulae, CNC358314 (2♂♀, CNC), L’Assumption, 7.viii.1936, Shewell, CNC358304, CNC358313, CNC358315, CNC358318 (2♂ 4♂♀, CNC), Lac Bernard, 7.viii.1938, G.E. Shewell, CNC358317 (1♀, CNC).

Additional material examined.

Canada. MB: Aweme, 20.viii.1917, N. Criddle, CNC358381 (1♀, CNC), 27.viii.1917, CNC358382 (1♀, CNC), NB: Pokeshaw, 47°47'N, 65°14'W, 27-30.vi.2011, S.E. Brooks, Malaise trap, CNC423058 (1♂, CNC), Saint-Jacques NB Botanical Garden, 47°26'20"N, 68°23'39"W, 27.vii.2013, O. Lonsdale, CNC358505 (1♀, CNC), ON: Ottawa, 20.vi.1954, D. Cobb, CNC358325 (1♂, CNC), St. Lawrence Is. Nat. Park, Grenadier I. Centre, 14.viii.1975, R.J. McMillan, Malaise trap, Code 2-263D, CNC358379 (1♀, CNC), 21.viii.1975, Code 2-278S, CNC358380 (1♀, CNC), Thornhill, 30.v.1964, J.R. Vockeroth, CNC358326 (1♂, CNC), QC: St. Ann-Perade , 6.viii.1930, A.L. Melander (1♂, USNM), Montreal, 8.viii.1950, A.L. Melander (1♂, USNM) . USA. AZ: Chiricahua Mts., S.W.R.S., 5400', 30.iv.1979, K.N. Barber (2♂, DEBU), CA: Victorville, 16.v.1955, W.R.M. Mason, CNC358467 (1♂, CNC), “UpStaAnaRiv”, Cienaga, 28.v.1948, J.L. Sperry (1♀, USNM), Vacaville, 19.iv.1949, A.T. McClay (1♀, USNM), Davis, 14.vi.1953, E.I. Schlinger (1♂, USNM), Toulumne Co., Summit Sonora Pass, 9.viii.1948, sweeping Salix eastwoodiae Ckll., Lot No. 108-1, K.E. Frick (3♂, USNM), Summit Sonora Pass, 10.viii.1948, Lot No. 116-1, K.E. Frick (1♀, USNM), San Diego Co. , Warmer Spr., 30.viii.1955, E.I. Schlinger (1♂, USNM), Berkeley, 9.vii.1917, J.M. Aldrich (1♂, USNM), 8.vii.1917 (2♂, USNM), Hemet Lake , 13.vi.1961, 500', J.G. Chillcott, CNC358533 (1♂, CNC), CO: Boulder, Valmont Butte, 1615 m, 1.vi.1961, J.R. Stainer, CNC358378 (1♀, CNC), Idaho Springs, 5mi SW, 2621 m, 27.v.1961, J.G. Chillcott, CNC358324 (1♂, CNC), Mt. Vernon Cn. nr. Golden, 2194 m, 31.vii.1961, C.H. Mann, CNC358468 (1♂, CNC), DC: Washington, "C 1 Aug 1956 ", P.H. Arnaud Jr. (1♂, USNM), Washington, “viii.5”, J.M. Aldrich (1♀, USNM), Washington, 17.viii.1915, A.L. Melander (1♂ 1♀, USNM), Chain Bridge, 8.v.1928, J.M. Aldrich (1♀, USNM), DE: Dover, 24.vi.1939, A.L. Melander (1♂, USNM), Newark, 31.v.1974 (1♀, UDCC), Newark, 25.viii.1974, D. Buntin (1♀, UDCC), GA: Pine Mt. , 1mi North, 12.vii.1957, W.R. Richards, CNC358347 (1♀, CNC), Rabun Bald, 9.viii.1957, W.R. Richards, CNC358355-358357 (3♀, CNC), Rabun Co. , 13.vii.1957, W.R. Richards, CNC358354 (1♀, CNC), Warwoman Crk., 4.vi.1957, W.R. Richards, CNC358358 (1♀, CNC), IA: Ames, 19.vi.1947, A.R. Brooks, CNC358461 (1♀, CNC), 28.vi.1947, CNC358458 (1♂, CNC), IL: Champaign, 1.vi.1953, J.F. McAlpine, CNC358460 (1♀, CNC), 22.ix.1956, CNC358459 (1♂, CNC), IN: LaFayette, vi-10, J.M. Aldrich (1♂, USNM), vii-10 (1♂, USNM), x-14 (1♀, USNM), MA: New Bedford, 30.viii.1896, Mass, A.L. Melander (1♂, USNM), Horse Neck Beach, 8.viii.1896, Hough, A.L. Melander (1♂, USNM), Dennisport, C. Cod, 1.viii.1964, J.R. Vockeroth, CNC358535 (1♀, CNC), Franklin Co. , Northfield, 276 Old Wendell Rd. , 20.viii.2016, mating on Erigeron annuus , #CSE2916, CNC654071, CNC654072 (1♂ 1♀, CNC), MD: Plummers Isl. , 20.vii.1913, R.C. Shannon (1♀, USNM), Talbot Co. , McDaniel (Wades Point), 19-21.ix.1986, Malaise trap in salt marsh with flowering Baccharis , W.E. Steiner (2♀, USNM), Fairfax Co. , Dead Run, 14.v.1914, R.C. Shannon (1♀, USNM), Montgomery Co. , Colesville, W.W. Wirth, 27.vii.1976 (1♀, USNM), 28.vii.1976 (2♀, USNM), Bethseda, C.W. Sabrosky, 24.vii.1961 (1♀, USNM), Bethseda, G.C. Steyskal, 10.vii.1970 (1♂, USNM), 16.vii.1979 (1♂, USNM), 24.viii.1975 (4♂ 1♀, USNM), 4mi SW of Ashton, G.F. and J.F. Hevel, 1.ix.1981, Malaise trap (1♂ 1♀, USNM), 24.vii.1982 (3♀, USNM), 15.viii.1982 (2♀, USNM), 19.v.1985 (1♀, USNM), 29.v.1986 (2♀, USNM), 31.v.1986 (1♀, USNM), 5.vi.1986 (1♀, USNM), P.G. Co, Camp Springs, Malaise trap, G.F. Hevel, 28.viii.1979 (1♀, USNM), 6.ix.1979 (1♀, USNM), 14.ix.1979 (1♀, USNM), 15.ix.1979 (2♀, USNM), NC: Highlands, 3800', 21.v.1957, J.R. Vockeroth, CNC358534 (1♂, CNC), Cashiers, 12.vii.1957, W.R. Richards, CNC358351-358353 (3♀, CNC), Clingman’s Dome, 5.viii.1957, W.R. Richards, CNC358350 (1♀, CNC), Highlands, Horse Cove, 30.vii.1957, W.R. Richards, CNC358349 (1♀, CNC), Highlands, Little Bear Pen Mt. , 5.viii.1957, W.R. Richards, CNC358348 (1♀, CNC), Highlands, 14.vii.1957, W.R. Richards, CNC358331 (1♂, CNC), 16.viii.1957, CNC358359, CNC358360 (2♀, CNC), 1158 m, 17.viii.1957, J.G. Chillcott, CNC358344 (1♀, CNC), 18.vii.1957, J.G. Chillcott, CNC358339 (1♂, CNC), 1158 m, 21.v.1957, J.R. Vockeroth, CNC358328 (1♂, CNC), 21.vii.1957, W.R. Richards, CNC358327, CNC358329, CNC358330 (3♂, CNC), 1158 m, 21.viii.1957, J.G. Chillcott, CNC358343 (1♀, CNC), W.R. Richards, CNC358361-358366 (6♀, CNC), 22.viii.1957, W.R. Richards, CNC358367-358370 (4♀, CNC), 1158 m, 23.viii.1957, J.G. Chillcott, CNC358338 (1♂, CNC), W.R. Richards, CNC358371 (1♀, CNC), 27.viii.1957, W.R. Richards, CNC358372, CNC358373 (2♀, CNC), 29.vii.1957, W.R. Richards, CNC358332 (1♂, CNC), 1158 m, 3.vi.1957, J.R. Vockeroth, CNC358345, CNC358346 (2♀, CNC), 5.viii.1957, J.G. Chillcott, CNC358333-358337, CNC358340-358342 (5♂ 3♀, CNC), Macon Co. , Wayah Gap, 1249 m, 29.vii.1957, J.G. Chillcott, CNC358374 (1♀, CNC), NH: Gorham, 15.vii.1958, J.R. Vockeroth, CNC358462 (1♀, CNC), Fabyan, 30.vi.1936, A.L. Melander (1♂, USNM), NJ: Hemlock Falls , Aug, A.L. Melander (1♀, USNM), NM: Grant Co. , ca. 20 mi n. Silver City, 32°57'N, 108°10'W, 7100', meadow, creek, 11.viii.2007, J.D. King, CNC358528 (1♂, CNC), NY: Trudeau , 15.vii.1977, S.W.T. Batra (1♂, USNM), Long Island , Cold Spring Harbor , July, A.L. Melander (1♂, USNM), PA: Susquehanna Co. , Rushboro , 12.v.1964, J.G. Chillcott, CNC358465 (1♂, CNC), Chester Co. , Toughkenamon , Stroud Res. Ctr., 39°51'37", 75°46'58", 14.ix.2007, E. Lake (2♂, UDCC), nr. Toughkenamon , Stroud Res. Ctr., N 39 51 37.2, W75 46 58.2 (1♀, UDCC), 14.ix.2007, C.R. Bartlett (1♀, UDCC), Oxford , 3.ix.2000, Malaise trap, R.L. Snyder (1♀, UDCC), TN: Knoxville , 20.v.1957, J.R. Vockeroth, CNC358375 (1♀, CNC), VA: Augusta Co. , Reed's Gap , 792 m, 7.iv.1962, J.R. Vockeroth, CNC358466 (1♂, CNC), Blacksburg , 28.v.1962, J.G. Chillcott, CNC358376 (1♀, CNC), Montgomery Co. , Christiansburg , ex flowers Umbelliferae , 21.vi.1962, J.G. Chillcott, CNC358377 (1♀, CNC), Montomery Co. , Longshop , 548 m, 29.v.1962, J.R. Vockeroth, CNC358323 (1♂, CNC), Arlington 4-mile Run , 18.v.1977, W.N. Mathis (1♀, USNM), Veitch , 9.v.1912, J.R. Malloch (1♀, USNM), Great Falls , “vi-1”, G.E. Quinter (1♀, USNM), Falls Church , Holmes Run, W.W. Wirth, 27.vii.1960 (1♂, USNM), 6.vi.1961, light trap (1♂, USNM), Fairfax Co. , Alexandria , Four Mile Run , 6.ix.1976, W.N. Mathis (1♂, USNM), Page Co. , 7mi W of Lunay, 8.vii.1978, G.F. Hevel (2♀, USNM), WV: Greenbrier Co. , Charmco , 6.ix.1983, G.F. and J.F. Hevel (1♂, USNM), WV: Thermopolis , 30.viii.1940, A.L. Melander (1♂, USNM) .

Comments.

Melanagromyza buccalis is a relatively abundant species most easily recognised by its angled gena, which is highest anterior to the midpoint of the eye. The distiphallus (dark distal outer casing and one pair of dark dorsolateral projections) is also diagnostic. Some specimens, even within collecting events, differ from others in being relatively dark or with a swollen fronto-orbital plate that may be accompanied by widely spaced ori, similar to the state observed in the M. virens group.

Figures

Figures 52 - 63. Melanagromyza buccalis Spencer, head 52 anterior 53 lateral 54, 55 M. glyptos sp. nov., head 54 anterior 55 lateral 56, 57 M. virens (Loew), head 56 anterior 57 lateral 58, 59 M. virginiensis Spencer, head 58 anterior 59 lateral 60 Melanagromyza sp., female (S. A. Marshall - Cuba) 61 Melanagromyza sp., female (S. A. Marshall - Ontario, Hornings Mills) 62, 63 M. virens (Loew), lectotype, head 62 anterolateral 63 lateral.

Figures 264 - 268. Melanagromyza buccalis Spencer, male genitalia 264 hypandrial complex, left lateral 265 phallus and proepiphallus, ventral 266 ejaculatory apodeme 267 external components, ventral 268 external components, left lateral.