Anthomyza dichroa Roháćek & Barber 2016, sp. nov.
Creators: name: Roháćek, Jindřich
name: Barber, Kevin N.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Anthomyzidae
Anthomyza
Anthomyza dichroa

description: Anthomyza dichroa sp. nov.
(Figs 1, 382, 401, 402, 404–418, 438)
Type material. HOLOTYPE: ♂, “ONT: Burlington, edge Tuck Ck, 20.vii.1997, KNBarber, sweeps/pooter Bromus inermis 43°21.2'N 79°46.6'W ” and “ HOLOTYPUS ♂ Anthomyza dichroa sp. n., J. Roháček & K. N. Barber det. 2013” (red). The specimen is in perfect condition, with highly visible, partly exposed genitalia (see Fig. 382) (CNCI, intact). PARATYPES: CANADA: MANITOBA: Brandon, 18.vii.1958, 1 ♂, R. B. Madge leg., 1 ♀, R. L. Hurley leg.; Ninette, 15.vii.1958, 1 ♀, N. B. Chillcott leg.; 5 mi SW Shilo, at margin of grain neld, 22.vii.1958, 1 ♀, J. G. Chillcott leg.; 5 mi SW Shilo, noodplain community near tamarack bog, 22.vii.1958, 1 ♂ 1 ♀ (1 ♀ genit. prep.), R. L. Hurley leg., 13.viii.1958, 1 ♂ (genit. prep.), J. G. Chillcott leg.; ~ 6 km SW Shilo, 49°45.19'N 99°41.28'W, edge of wet area, 10.vii.2011, sweeps, grasses and sedges, 1 ♂ 1 ♀, sweeps, incl. Equi. ssuviatile, Carex, Calamagrostis, Impatiens, 1 ♂ 1 ♀, K. N. Barber leg. (all CNCI); 5 km N Gardenton, Tallgrass Prairie Reserve, 49°10.71'N 96°40.75'W, sweep prairie at roadside, 6.vii.2000, 1 ♀ (LEMQ 0040105); Spruce Woods Prov. Pk., Marsh Lake, sweeping path in deciduous forest, 8.vii.1992, 1 ♀ (LEMQ 0040103), both T. A. Wheeler leg; Winnipeg Beach, [-]. vi.1954, 1 ♂, H. D. Stalker leg. (AMNH). NOVA SCOTIA: CBH [Cape Breton Highlands] Nat. Pk., Pleasant Bay, PG684871, wet hardwood forest, 10.vii.1984, 2 ♀♀, H. J. Teskey leg. (CNCI); Inverness, 6.viii.1970, 1 ♀, C. Sabrosky leg. (USNM); Kentville, 6.viii.1958, 1 ♀; Lockeport, 30.vii.1958, 1 ♀, 11.viii.1958, 1 ♂; Springneld, 2.viii.1958, 1 ♂, 6.viii.1958, 1 ♂, all J. R. Vockeroth leg. (all CNCI). ONTARIO: Batchawana P. Pk., 46°56.67'N 84°33.30'W, sweeps, mostly Carex spp. in wet trench under mixed canopy, 19.vii.2014, 1 ♂ 1 ♀, K. N. Barber leg. (DEBU 01503964, -65); Bell’s Corners, 7.vii.1952, 1 ♂, J. F. McAlpine leg. (CNCI); Belleville, 22.vi.1971, 1 ♂, C. D. Rollo leg. (DEBU, genit. prep.); ~ 1 km NW Bewdley, Jct. Hwy 28 & Rice Lake Rd., 44°05.92'N 78°20.18'W, sweeps, mostly creekside Carex, 7.vii.2005, 1 ♀, K. N. Barber leg.; Blackburn, 12.vii.1954, 2 ♀♀, W. R. M. Mason leg. (all CNCI); Bruce Co., Miller Lake, 21.vii.1996, 1 ♀, S. A. Marshall leg. (DEBU); Bruce Co., Scone, North Saugeen River, riparian sweep, 17.vii.2004, 1 ♂ 1 ♀, M. Buck leg. (DEBU 00298402, -24); Bruce Peninsula N. P., bank of Crane River nr. Hwy 6, 45°08.9'N 81°28.1'W, sweeps, grasses / sedges, 31.vii.1997, 3 ♂♂, S. A. Marshall leg., sweeps/pooter, Calamagrostis & Carex, 31.vii.1997, 1 ♂, K. N. Barber leg. (DEBU); Bruce Peninsula N. P., Dorcas Bay Rd. at Willow Creek, 45°09.4'N 81°34.4'W, sweeps, mostly creekside graminoids, 3.vii.1999, 2 ♂♂ 1 ♀; Bruce Peninsula N. P., Emmett Lake, 45°13.1'N 81°29.0'W, sweeps, graminoids, wet area under Acer, 2.vii.1999, 6 ♂♂ 3 ♀♀; same locality but 45°13.5'N 81°28.2'W, sweeps, mostly graminoids, open area under Acer / Quercus, 2.vii.1999, 6 ♂♂ 3 ♀♀; Bruce Peninsula N. P., Singing Sands, 45°11.6'N 81°34.4'W, sweeps, grasses along dry ditch, 4.vii.1998, 1 ♂; same locality but 45°11.6'N 81°34.7'W, sweeps, Agropyron / Calamagrostis, 5.vii.1998, 1 ♂ 1 ♀, all K. N. Barber leg. (all DEBU); Burlington, edge Tuck Ck, 43°21.2'N 79°46.6'W, sweeps/pooter, Bromus inermis, 15.vii.1997, 2 ♀♀, 18.vii.1997, 4 ♂♂ 10 ♀♀, 20.vii.1997, 10 ♂♂ 7 ♀♀, sweeps, mowed long grasses, 1.viii.2003, 2 ♀♀; Burlington, Royal Botanical Gdn., 43°17.5'N 79°52.4'W, sweeps, trailside Poa, Agrostis, Phleum, Festuca, Juncus, 16.vii.1997, 2 ♀♀, all K. N. Barber leg. (all CNCI); same locality but 43°17.8'N 79°52.6'W, sweeps, trailside vegetation in mixed hardwood, 14.vii.2002, 3 ♂♂ 9 ♀♀ (CNCI), 15.vii.2002, 7 ♂♂ 14 ♀♀ (CNCI 6 ♂♂ 13 ♀♀, SMOC 1 ♂ 1 ♀), 16.vii.2002, 9 ♂♂ 15 ♀♀ (CNCI), trailside sweeps, mostly Carex, Fragaria, Solidago, 18.vii.2002, 10 ♂♂ 11 ♀♀; same locality but 43°17.79'N 79°52.61'W, trailside sweeps, mostly Carex, Fragaria, Solidago, 27.vii.2003, 12 ♂♂ 17 ♀♀ (1 ♀ genit. prep.) (all CNCI), all K. N. Barber leg.; Dubreuilville, 48°21.09'N 84°33.90'W, sweeping undergrowth Pinus / Populus forest, with Clintonia, Vaccinium, ferns, graminoids, 10.vii.2010, 1 ♂, J. Roháček leg. (SMOC, genit. prep.); ~ 3.8 km ENE Dugwal, 48°35.33'N 80°57.90'W, sweeps, wet ditch, Carex utriculata, Equisetum ssuviatile, Scirpus, 13.vii.2013, 1 ♂; ~ 55 km NNW Elliot Lake, s. of Rocky Island Lake, 46°49.32'N 82°59.54'W, sweeps, Scirpus, grasses, Equisetum, ferns, 3.vii.2010, 2 ♂♂ 1 ♀, all K. N. Barber leg. (all CNCI); same locality but 455 m, sweeping vegetation with predominant grasses, 3.vii.2010, 10 ♂♂ 10 ♀♀, J. Roháček leg. (SMOC, 1 ♀ genit. prep.); ~ 63 km NNW Elliot Lake, s. of Rocky Island Lake, 46°49.80'N 83°09.08'W, sweeps, streamside graminoids, 4.vii.2010, 1 ♀, K. N. Barber leg. (CNCI); same locality but 425 m, sweeping streamside graminoids, 4.vii.2010, 1 ♀ (genit. prep.); ~ 61 km NNW Elliot Lake, Three Lakes, 46°49.94'N 83°06.31'W, 425 m, sweeping grasses [mostly Glyceria striata] near lakeshore, 3.vii.2010, 7 ♂♂ 5 ♀♀; Fergus nr. Guelph, Grand River, riverside vegetation, 30.vii.1994, 10 ♂♂ 12 ♀♀ (1 ♂ 3 ♀♀ genit prep.), all J. Roháček leg. (all SMOC); Wellington Co., Fergus, Grand River, sweep in Eupatorium, 2.viii.1993, 1 ♂, D. C. Caloren leg.; Fergus, 43°41.5'N 80°23.2'W, Grand R. noodplain, sweeps/pooter, Bromus inermis, 17.vii.1997, 3 ♂♂ 5 ♀♀ (1 ♀ genit. prep.), K. N. Barber leg.; Goderich, 22.vi.1977, 2 ♀♀, K. Barber leg. (all DEBU); Goulais River, Pine Shores Rd., 46°41.67'N 84°25.47'W, sweeps, Thalictrum, Clematis, sedges, edge of Cranberry Ck., 4.vii.2007, 1 ♂ 1 ♀, K. N. Barber leg. (CNCI); Grand Bend, 8.vii.1939, 1 ♂, 11.vii.1939, 1 ♀, G. E. Shewell leg. (CNCI); 7 mi E Grifnth, 22.vii.1984, 2 ♀♀, B. E. Cooper leg. (CNCI); Guelph, 13.vii.1983, 1 ♀, R. D. Smith leg., 6.vii.1979, 1 ♀, K. L. Bailey leg., 1 ♀, J. E. Corrigan leg., “5.7”.1965, 1 ♂, C. J. Edwards leg., 13.vii.1978, 1 ♀, P. Jursevskis leg., 17. vi.1979, 1 ♂, 3.vii.1979, 6 ♂♂ 1 ♀, 4.vii.1979, 2 ♂♂ 1 ♀, 5.vii.1979, 1 ♂ 1 ♀, 25.vii.1979, 2 ♂♂, 2.viii.1980, 1 ♀, 23.vii.1982, 3 ♀♀, Malaise trap, 14.vii.–16.viii.1981, 1 ♂, 1–20.vii.1982, 1 ♀, K. N.Barber leg. (DEBU); Hamilton, Malaise trap, 10–13.vii.1980, 1 ♂, M.Sanborne leg.(DEBU); ~ 5 km NE Heyden, Hwy 552, 46°41.37'N 84°16.85'W, sweeps, roadside ditch/stream, graminoids, 31.vii.2006, 2 ♂♂ 2 ♀♀; ~ 13 km N Heyden, ~ 3.8 km E Robertson Lake Rd., 46°45.7'N 84°18.4'W, sweeps, Carex, Impatiens, Aster, 1.viii.2005, 1 ♀; Icewater Creek WS [watershed], 12.7 km NNE Searchmont, mi.10.5 Whitman Dam Rd., alder thicket, 21.vi.1986, 1 ♂, all K. N. Barber leg. (all CNCI); Icewater Creek WS, ~ 12.7 km NNE Searchmont, mi.10.5 Whitman Dam Rd., riparian meadow/ alder thicket, Malaise, 21–28.vii.1986, 1 ♀, 27.viii.–8.ix.1986, 1 ♂, [K. N. Barber] leg. (CNCI); Icewater Creek WS, 46°53.7'N 84°03.4'W, sweeps, Thalictrum, sedge, fern, riparian mixed forest, 7.vii.1998, 1 ♂; same locality but 46°53.72'N 84°03.39'W,sweeps, riparian ferns,graminoids, 5.viii.2006, 3 ♂♂ 3 ♀♀; ~ 11.9 km N Kejick, 49°43.89'N 95°04.14'W, sweeps, wet ditch, graminoids/ Equisetum, 30.vii.2008, 1 ♀, all K. N. Barber leg. (all CNCI); 6 km S Langton, Concession Rd. 8, S Hwy 45, 42°42.01'N 80°31.93'W, sweep in Carolinian forest, 29.vi.2002, 1 ♀ (LEMQ 0040474), sweep clearing at dusk near Carolinian forest, 29.vi.2002, 1 ♀ (LEMQ 0040474), S. Boucher leg.; Manitoulin Is., Carter Bay, 45°36.3'N 82°08.5'W, sweeps, Pearly Everlasting [Anaphalis margaritacea], 30.vi.1999, 5 ♂♂ 4 ♀♀; Manitoulin Is., ~ 2.2 km N Cold Springs, Perch Ck. @ Hwy 540, 45°53.2'N 82°06.3'W, sweeps/pooter, Calamagrostis canadensis, 1.viii.1997, 1 ♀; Manitoulin Is., 0.7 km N Michael’s Bay Pk., 45°36.4'N 82°06.1'W, sweeps, low veg. in mixed wood, 4.vii.1999, 1 ♀, all K. N. Barber leg.; Metcalfe, 24.vii.1984, 2 ♀♀, 22.vii.1986, 1 ♀, B. E.Cooper leg. (all CNCI); Oakville, 5.vii.1978, 1 ♀, D. Morris leg.(DEBU); One-sided [= Caliper] Lake, 26.vi.1960, 1 ♂, Kelton & Whitney leg.; Ottawa, 15.vii.1938, 4 ♂♂ 7 ♀♀, 17.vii.1938, 2 ♀♀, 27.vi.1946, 1 ♀, A. R. Brooks leg., 17.vi.1955, 1 ♂, 26.vii.1955, 2 ♀♀, J. G. Chillcott leg., 22.vii.1954, 1 ♂ 1 ♀ (1 ♀ genit. prep.), W. R. M. Mason leg., 5.vii.1938, 1 ♂, G. E. Shewell leg., 9.viii.1953, 1 ♀, 17.vii.1955, 2 ♂♂ 1 ♀, J. F. McAlpine leg.; Ottawa, compost heap, 9.vii.1953, 1 ♂, bleeding elm, 9.vii.1953, 1 ♀, 30.vii.1953, 1 ♀, stump of bleeding elm, 21.vi.1955, 1 ♀, J. F. McAlpine leg.; Ottawa, 26.vii.1955, 2 ♂♂ 2 ♀♀, 12.vii.1956, 1 ♂ 1 ♀, 22.vi.1963, 1 ♂ 1 ♀ (1 ♀ genit. prep.), 30.vi.1963, 3 ♂♂ 7 ♀♀, 6.vii.1963, 3 ♂♂ 4 ♀♀, 20.vii.1963, 1 ♀, 13.vii.1963, 10 ♂♂ 7 ♀♀ (1 ♀ genit. prep.), 28.vi.1964, 2 ♂♂, 12.vii.1964, 1 ♀, J. R. Vockeroth leg.; Ottawa, taken at light, 29.vi.1964, 1 ♀, damp second-growth Acer-Betula wood, 11.viii.1989, 1 ♀, J. R. Vockeroth leg.; Ottawa, at light during heavy rain, 26.vi.1964, 1 ♂, [J. R. Vockeroth?] leg. (all CNCI); Ottawa, Beechwood Cemetery, 45°26.88'N 75°40.05'W, sweeps, Equisetum hyemale, grasses nr.creek outlet, 27.vii.2007, 3 ♂♂, K. N. Barber leg.(CNCI); Ottawa, Black Rapids, 28.vi.1958, 1 ♂, 28.vi.1959, 1 ♂ 1 ♀ (CNCI); Ottawa, Mackay Lake Outlet, 6.viii.2006, 1 ♀ (CNCI, Diptera #58957); Ottawa, Mer Bleue, 25.vi.1964, 1 ♀ (CNCI), all J. R. Vockeroth leg.; Pancake Bay P. Pk., 46°57.89'N 84°42.55'W, sweeps, Carex in moist area under canopy, 7.viii.2004, 3 ♂♂ (DEBU 01501447–49); Pancake Bay P.Pk., 46°58.00'N 84°42.47'W, Black Creek noodplain, sweeps, Carex / Calamagrostis, 7.viii.2004, 1 ♀ (DEBU 01501100), 19.vii.2014, 2 ♂♂ 1 ♀ (DEBU 01503968–70), all K. N. Barber; ~ 1 km NW Ponsonby, 43°38.2'N 80°22.9'W, sweeps/pooter, roadside, mostly Poa pratensis & Poa compressa, 17.vii.1997, 1 ♂ 1 ♀, K. N. Barber leg. (CNCI); HaldimandNorfolk Co., Port Ryerse, along stream, 15.vii.1986, 1 ♀, R. Danielsson leg. (MZLU, genit. prep.); Powassan, 14.vii.1978, 1 ♂, J. Cappleman leg. (DEBU); Prescott, 44°42.8'N 75°31.1'W, sweeps/pooter, mixed grasses, 22. viii.1997, 1 ♀; ~ 4 km SW Richmond, Jct. Munster Rd./Kettles Rd., 45°06.83'N 75°52.76'W, sweeps, sedges, Equisetum ssuviatile, nooded ditch/fen, 23.vii.2007, 1 ♂; ~ 2 km SW Richmond, along railway 3.2 km NE Kettles Rd., 45°08.54'N 75°51.09'W, sweeps, Equisetum ssuviatile, Typha, Calamagrostis, Impatiens, ditch, 25.vii.2007, 1 ♂ 1 ♀, all K. N.Barber leg.; Rockport, 24.vii.1963, 1 ♂ 2 ♀♀, 5.viii.1985, 1 ♀, J. R.Vockeroth leg. (all CNCI); Rondeau P. Pk., Spicebush Trail, 42°18'08"N 81°51'13"W, sweeps, mostly Impatiens / Carex, 29.vii.2003, 1 ♂ 1 ♀, K. N. Barber leg. (DEBU 01500140, -41); S[ault] S[te.] Marie, S. of Algoma U[niversity] College, 46°29.9'N 84°17.2'W, sweeps, Calamagrostis canadensis, 29.viii.1997, 1 ♂, 22.vi.1998, 1 ♂, sweeps, mostly Calamagrostis canadensis, 6.viii.2001, 2 ♂♂, sweeps, low veg. under Populus / Betula, 3.viii.1997, 1 ♀, sweeps, trailside Carex / Scirpus, 14.vii.1998, 1 ♂ 2 ♀♀, sweeps, Calamagrostis canadensis & Carex aquatilis, 23.vii.1997, 1 ♂ 1 ♀, sweeps, Calamagrostis canadensis under Populus / Betula, 23.vii.1997, 1 ♂ 1 ♀, sweeps, mostly Carex aquatilis, 17.vii.2001, 1 ♀, 18.vii.2001, 1 ♀; same locality but 46°29.82'N 84°17.17'W, sweeps, mostly Carex aquatilis near river, 21.vii.2005, 3 ♂♂ 2 ♀♀, sweeps, mostly graminoids/ Impatiens under canopy, 21.viii.2004, 1 ♀; same locality but 46°29.88'N 84°17.19'W, sweeps, Carex aquatilis, 27.vii.2005, 1 ♀, sweeps, Impatiens, Carex, ferns under canopy, 21.vii.2005, 2 ♂♂ 1 ♀; same locality but S. of Algoma University, 46°29.88'N 84°17.19'W, sweeps, Carex spp., Scirpus cyperinus, 5.vii.2008, 1 ♀, all K. N.Barber leg.(all CNCI); S[ault] S[te.] Marie, Baseline Rd. @Allen’s S[ide] R[oad], 46°31.35'N 84°24.38'W, sweeps, graminoids/ Impatiens, under Populus canopy, 14.viii.2004, 5 ♂♂ 7 ♀♀; S[ault] S[te.] Marie, Baseline Rd., 46°31.40'N 84°24.40'W, Malaise #1, Aster [Doellingeria], Rubus, Equisetum, Carex, Solidago, in aspen clearing, 22.viii.–2.ix.2005, 1 ♀, 16–30.ix.2005, 1 ♀ (all CNCI); same locality but sweeps, Thalictrum, Rubus, Equisetum, Carex, ferns under aspen, 25.vi.2005, 1 ♂, 10.vii.2005, 1 ♂ sweeps, Aster [Doellingeria], Rubus, Equisetum, Carex, ferns under aspen, 25.vi.2005, 1 ♀, 26.vi.2005, 1 ♂ 2 ♀♀, 8.vii.2005, 1 ♂ 1 ♀, 10.vii.2005, 3 ♀♀ (1 ♀ genit.prep.), 14.vii.2005, 1 ♀, 16.vii.2005, 1 ♀, 18.vii.2005, 1 ♀ (CNCI), 22.vii.2005, 3 ♂♂ 2 ♀♀, 29.vii.2005, 1 ♀ (AMNH), 8.viii.2005, 2 ♀♀, 23.viii.2011, 4 ♂♂ 2 ♀♀ (LACM), 28.viii.2011, 3 ♂♂ 1 ♀, 27.vii.2012, 3 ♂♂ 7 ♀♀, 29.vii.2012, 1 ♂ 7 ♀♀, 24.viii.2013, 1 ♀, sweeps, Aster [Doellingeria], Rubus, graminoids under aspen, 19.vii.2006, 1 ♂ 1 ♀, sweeps, mostly Carex in aspen clearing, 25.vi.2005, 1 ♂ 1 ♀ (CNCI), 16.vii.2005, 3 ♂♂ 4 ♀♀ (INHS), sweeps, mostly ferns under aspen, 27.vii.2012, 3 ♂♂ 4 ♀♀, 28.vii.2012, 4 ♂♂ 6 ♀♀ (USNM), 29.vii.2012, 1 ♂ 3 ♀♀, 25.viii.2012, 1 ♂ (CNCI), all K. N. Barber leg.; same locality but sweeping, Aster [Doellingeria], Rubus, Equisetum, Carex, Clematis, ferns under aspen (Populus), 7.vii.2010, 11 ♂♂ 8 ♀♀ (1 ♂ 1 ♀ genit. prep.), 12.vii.2010, 3 ♂♂ 3 ♀♀, J. Roháček leg. (SMOC); same locality but 46°31.40'N 84°24.45'W, sweeps, edge of forest, Solidago, Rubus, Equisetum, grasses, 25.vi.2005, 1 ♂, 10.vii.2005, 2 ♀♀, 14.vii.2005, 2 ♂♂ 1 ♀; same locality but 46°31.44'N 84°24.40'W, sweeps, Aster [Doellingeria], Rubus, Carex, ferns, under aspen, 10.vii.2005, 2 ♂♂ 2 ♀♀; same locality but w. of creek, 46°31.52'N 84°24.63'W, sweeps, Carex under ash / aspen, 22.vii.2005, 10 ♂♂ 2 ♀♀; same locality but 46°31.41'N 84°24.57'W, sweeps, sparse veg. on disturbed site, 26. vi.2005, 1 ♀, all K. N. Barber leg. (all CNCI); S[ault] S[te.] Marie, Bellevue Pk., 46°30.1'N 84°18.1'W, sweeps, mostly Calamagrostis, 7–8.vii.2000, 2 ♀♀, K. N. Barber leg. (CNCI, 1 ♀ genit. prep.); S[ault] S[te.] Marie, Birchwood Pk., mixed forest, 13.vi.1986, 3 ♀♀, 15.vi.1986, 1 ♂, 28.vi.1986, 2 ♂♂; same locality but 46°30.7'N 84°15.6'W, sweeps, trailside Impatiens, fern, raspberry, grass under Populus / Betula, 4.ix.1997, 1 ♂, sweeps, trailside Impatiens, fern, raspberry, grass under Betula / Acer, 30.viii.1997, 3 ♀♀, 1.ix.1997, 2 ♀♀, 4.ix.1997, 1 ♂, sweeps, mostly Impatiens under Betula / Acer, 20.vi.1998, 1 ♀, sweeps, Impatiens under Betula / Acer, 27.vi.1998, 1 ♂, all K. N. Barber leg. (all CNCI); same locality but sweeps, graminoids/ Impatiens, 23.viii.2002, 6 ♂♂ 3 ♀♀, K. N. Barber leg.(CNCI 5 ♂♂ 2 ♀♀, SMOC 1 ♂ 1 ♀); same locality but 46°30.67'N 84°15.63'W, sweeps, Impatiens, Aster, under Betula / Acer, 11.ix.2011, 1 ♀, K. N. Barber leg. (CNCI); S[ault] S[te.] Marie, Bristol Place, 28.vi.1987, 1 ♂; S[ault] S[te.] Marie, Bristol Pl. Pk., 46°30.8'N 84°16.6'W, sweeps, Impatiens under Betula / Populus, 9.vii.1998, 1 ♂ (both CNCI), sweeps/pooter, Phalaris arundinacea, 8.viii.1997, 2 ♂♂ 2 ♀♀ (NMPC), sweeps, Phalaris arundinacea, 18.vii.1998, 1 ♀, sweeps, pathside Impatiens / sedge under Betula / Populus, 16.vii.1998, 2 ♂♂ (1 ♂ genit. prep.), sweeps, low veg. including grasses, 14.viii.1999, 1 ♂, sweeps, mostly sedges, 2.vii.2001, 7 ♂♂ 5 ♀♀ (incl. pair in copula), Carex under canopy, 4.vii.2002, 1 ♀, 20.vii.2003, 1 ♂ 5 ♀♀, sweeps, Impatiens under canopy, 20.vii.2003, 1 ♀, sweeps, Impatiens, Rubus, Phalaris, Carex under Populus, 28.vi.2005, 3 ♂♂ 6 ♀♀ (CNCI), K. N. Barber leg.; same locality but sweeps, Impatiens / Phalaris under Populus, 23.vii.2005, 19 ♂♂ 17 ♀♀ (CNCI 17 ♂♂ 15 ♀♀, SMOC 2 ♂♂ 2 ♀♀), [sweeps], Phalaris, Carex, Impatiens under Populus, 12.vii.2006, 7 ♂♂ 6 ♀♀ (1 ♂ wing illustration), [sweeps], graminoids, Impatiens, Rubus, Clematis, 18.vii.2006, 5 ♂♂ 1 ♀ (CNCI), K. N. Barber leg.; same locality but sweeping Impatiens mixed with Clematis, Equisetum, Rubus, ferns, Phalaris, 7.vii.2010, 8 ♂♂ 2 ♀♀, J. Roháček leg. (SMOC, 1 ♂ photographed); same locality but 46°30.87'N 84°16.68'W, sweeps, mostly Carex gynandra, 30.vi.2008, 1 ♂ 4 ♀♀, sweeps, Impatiens, Clematis, Equisetum, Rubus, ferns, Calamagrostis, 1.vii.2008, 1 ♂ (CNCI); same locality but 46°30.77'N 84°16.66'W, sweeps, Impatiens, Clematis, Equisetum, Rubus, ferns, Phalaris, 29.vi.2008, 1 ♂ 3 ♀♀, 1.vii.2008, 1 ♀, 4.vii.2008, 5 ♂♂ 6 ♀♀, 5.vii.2008, 3 ♂♂ 6 ♀♀, 8.vii.2008, 1 ♂ (CNCI), 9.vii.2008, 4 ♂♂ 3 ♀♀ (CASC), 11.vii.2008, 2 ♀♀, 13.vii.2008, 1 ♂, 7.viii.2008, 1 ♂, 27.vii.2009, 7 ♂♂ 6 ♀♀, 8.ix.2009, 4 ♂♂ 4 ♀♀, sweeps, trailside vegetation, 25.ix.2009, 1 ♀, sweeps, Phalaris arundinacea under Populus, 7.viii.2008, 7 ♂♂ 2 ♀♀ (CNCI), all K. N. Barber leg.; S[ault] S[te.] Marie, Finn Hill, 46°31.48'N 84°17.36'W, sweeps, Phalaris arundinacea, 17.ix.2005, 1 ♂, sweeps, mostly Scirpus microcarpus, 14.viii.2005, 1 ♀, 25.viii.2005, 1 ♂, 1.ix.2005, 1 ♀, 16.ix.2005, 1 ♂, K. N. Barber leg. (CNCI); same locality but sweeping graminoid vegetation, 7.vii.2010, 6 ♂♂ 4 ♀♀ (1 ♂ 3 ♀♀ genit.prep.), 12.vii.2010, 1 ♂ (genit. prep.), J. Roháček leg. (SMOC); same locality but 46°31.48'N 84°17.39'W, sweeps, graminoids, Equisetum, Rubus, Eurybia, 25.vii.2010, 1 ♂, sweeps, mostly grasses, 25.vii.2010, 1 ♂; same locality but 46°31.63'N 84°17.33'W, sweeps, graminoids, herbs, composites, edge of Populus tremuloides, 8.viii.2008, 1 ♂; same locality but 46°31.63'N 84°17.43'W, sweeps, Impatiens, ferns, Carex gynandra, 8.vii.2006, 2 ♂♂ 2 ♀♀, 15.vii.2006, 1 ♂ 3 ♀♀; same locality but 46°31.64'N 84°17.40'W, sweeps, mostly Calamagrostis, Rubus, Aster under Populus, 17.viii.2003, 2 ♂♂; same locality but 46°31.6'N 84°17.3'W, sweeps, graminoids/ Rubus, 19.vii.2005, 1 ♂; same locality but 46°31.7'N 84°17.5'W, sweeps, mostly sedges in trail, 4.vii.2002, 1 ♀, sweeps, mostly graminoids, 10.viii.2002, 1 ♂; same locality but 46°31.9'N 84°17.6'W, sweeps, mostly graminoids, 10. viii.2002, 1 ♀, all K. N. Barber leg. (all CNCI); Sault Ste. Marie, Fish Hatchery Road, near Coldwater Creek, 46°34.33'N 84°17.23'W, sweeping graminoids, Impatiens, 9.vii.2010, 3 ♂♂ 2 ♀♀, J. Roháček leg. (SMOC, 1 ♀ genit. prep.); S[ault] S[te.] Marie, Ft. Creek Cons[ervation] Area, 46°32.5'N 84°20.8'W, sweeps, graminoids under canopy, 7.viii.2001, 2 ♂♂ 3 ♀♀; S[ault] S[te.] Marie, Kinsmen Pk., 46°35.7'N 84°16.7'W, sweeps, mostly Carex, 11.viii.2002, 1 ♂ 1 ♀; S[ault] S[te.] Marie, Sault Coll[ege] Outdoor Lab, 46°32.1'N 84°18.2'W, sweeps, Carex sp., 25.vii.1997, 1 ♂, sweeps, streamside graminoids under Acer / Betula, 18.vi.1998, 1 ♀; same locality but 46°32.08'N 84°18.21'W, sweeps, graminoids/ferns in opening, 17.vii.2005, 2 ♀♀; same locality but 46°32.12'N 84°18.04'W, sweeps, mostly graminoids, Equisetum under canopy, 12.viii.2008, 1 ♂; S[ault] S[te.] Marie, hydro cut nr. Sault Coll[ege] Outdoor Lab, 46°32.1'N 84°18.0'W, sweeps, mostly sedges, 10.vii.2002, 2 ♂♂ 3 ♀♀, sweeps, Scirpus cyperinus, 24.viii.2005, 4 ♂♂, all K. N. Barber leg. (all CNCI); S[ault] S[te.] Marie, 1405 3 rd Line E, 46°32.86'N 84°16.80'W, sweeps, graminoids under mostly aspen, 7.viii.2005, 1 ♂; S[ault] S[te.] Marie, Jct. 6 th Line & Hwy#17, 46°35.83'N 84°17.61'W, sweeps, noodplain of Root River, 7.viii.2005, 1 ♀; S[ault] S[te.] Marie, Hwy #17 city limits, 46°36.58'N 84°17.83'W, sweeps, Calamagrostis canadensis in wet area, 16.viii.2004, 1 ♀, all K. N. Barber leg. (all CNCI); ~ 10 km W S[ault] S[te.] Marie, Airport Rd., natural gas r[igh]t-of-way, 46°29.9'N 84°28.9'W, sweeps, graminoids, composites, Equisetum, Rubus, ferns, 25.viii.2008, 1 ♂; same locality but 46°29.72'N 84°28.96'W, sweeps, graminoids, Equisetum, herbs, 5.viii.2009, 2 ♂♂, sweeps, graminoids, composites, Equisetum, Rubus, ferns, 12.vii.2010, 6 ♂♂ 4 ♀♀, 14.vii.2010, 2 ♂♂ 4 ♀♀, all K. N. Barber leg. (all CNCI); same locality but sweeping graminoids, composites, Equisetum, Rubus, ferns, 12.vii.2010, 1 ♂, J. Roháček leg. (SMOC, genit. prep.); ~ 10 km W S[ault] S[te.] Marie, Sunnyside Beach Rd., 46°29.70'N 84°31.87'W, sweeps, emergent Equisetum ssuviatile in wet ditch, 22.vi.2007, 1 ♂; NW S[ault] S[te.] Marie, Red Rock, 46°36.21'N 84°32.85'W, sweeps, graminoids, ferns, Impatiens, 4.viii.2006, 3 ♂♂ 1 ♀; same locality but 46°36.68'N 84°32.47'W, Pebble Beach, sweeps, riparian graminoids/ferns, 6.viii.2006, 1 ♀, all K. N. Barber (all CNCI); Short Hills P. Pk., sweeps, Terrace Ck. Trail west loop, 43°05.7'N 79°16.4'W, streamside graminoids, 17.vii.2002, 1 ♀; same locality but east loop, 43°05.8'N 79°16.1'W, mostly Carex / Impatiens in mixed hardwood, 17.vii.2002, 1 ♀, both K. N. Barber leg. (both DEBU); S[outh] March, 8.viii.1968, 1 ♂, J. R. Vockeroth leg.; 2 km E Sowerby, Harris Ck. Rd., 46°17.80'N 83°21.10'W, sweeps, sedges along beaver pond, 30.vii.2006, 1 ♀; 0.4 km S Stonecliffe, Pine Valley Rd. @ RR crossing, 46°11.9'N 77°52.8'W, sweeps, graminoids, 9.vii.2001, 1 ♂ 1 ♀; ~ 74 km NNE Thessalon, 46°53.94'N 83°16.23'W, shore of Mississagi R., sweeps, graminoids, herbs, Equisetum spp., 17.vii.2010, 1 ♂ 2 ♀♀, all K. N. Barber (all CNCI); Walpole Island, 13.vii.1980, 1 ♂ 2 ♀♀; Windsor, Ojibway Prairie Reserve, 18.viii.1983, 1 ♀, all K.N. Barber leg.(all DEBU); Essex Co., Windsor,Ojibway Prairie, 42°15'51"N 83°04'30"W, 20.vii.2002, 1 ♂ 1 ♀, S.A. Marshall leg. (DEBU 00222440, -48). QUEBEC: Aylmer, 19.vii.1926, 1 ♀, C. B. Hutchings leg., 16.vii.1959, 2 ♂♂ 3 ♀♀, 17.vii.1959, 1 ♂, C. H. Mann leg. (CNCI); Baptiste Lake, 45°10'N 78°00'W, sweep near lake shore, 25.vii.2000, 1 ♂, J. Forrest leg. (LEMQ 0040096); Beechgrove, 45°39'N 76°08'W, 29.vi.1962, 2 ♂♂, J. R. Vockeroth leg.; Breckenridge, 21.vi.1959, 1 ♂, 12.vii.1959, 1 ♂ 2 ♀♀, 14.vii.1959, 2 ♀♀, C. H. Mann leg.; Cottage Beaulieu, 20.vii.1906, 2 ♀♀, Beaulieu leg. (all CNCI); Eugenia, Eugenia Falls, sweep along river, 30.vi.2001, 1 ♂, S. E. Brooks leg. (LEMQ 0040097); Gaspésie, near Routhierville, 48°10.9'N 67°08.8'W, sweep picnic area, 4.viii.2001, 1 ♀, S. Boucher leg. (LEMQ 0040100); Gatineau Park, 45°34'N 75°57'W, 28.vi.1995, 1 ♀ (LEMQ 0040095); Gatineau Co., Masham Township, 27.vii.1995, 1 ♂ (LEMQ 0040095), both E. Ikeda leg.; Hudson, Parc Lévy Macdonald, 45°27'N 74°09'W, 26.vi.2001, sweep by stream, 1 ♀ (LEMQ 0040101), J. Forrest leg., sweeping grass, 1 ♂ 1 ♀ (LEMQ 0040094, -99), S. Boucher leg.; Îles de la Madeleine, Île de la Grand[e] Entrée, Chemin du Bassin Ouest, 47°32.96'N 61°32.64'W, sweep neld along road, 9.vii.2004, 1 ♀, S. Boucher leg. (LEMQ 0040497); Knowlton Ldg., 20.vii.1968, 2 ♀♀, J. R. Vockeroth leg. (CNCI); Lac Roddic, 16 km S Maniwaki, 22.vi.1991, 9 ♂♂ 7 ♀♀, M. Barták leg. (MBPC, 2 ♂♂ 4 ♀♀ genit. prep.); Laniel, 3.vii.1944, 1 ♀, A. R. Brooks leg. (CNCI); Mont-St-Hilaire Reserve, Pain de Sucre Trail, sweep along trail in forest, 27.vi.2001, 1 ♂ 1 ♀, S. E. Brooks leg. (LEMQ 0040093, -98); Mont-St-Hilaire Biosphere Reserve, Pain de Sucre Trail, 27.vi.2001, sweep trail edge, 2 ♀♀ (LEMQ 0040325, -27), S. E. Brooks leg., sweep at brook, 2 ♂♂ 2 ♀♀ (LEMQ 0040368, -70, -72, -77), M. Pollet leg.; Old Chelsea, 9.viii.1961, 1 ♂, 30.viii.1961, 1 ♀; Old Chelsea, Summit King Mt., 1150', 18.vii.1961, 2 ♂♂, 18.vi.1963, 1 ♀, all J. R. Vockeroth leg.; Kam[ouraska] Co., Parke Reserve, sweeping Kalmia angustifolia, 11.vii.1957, 1 ♀, G. E. Shewell leg. (all CNCI); Pointe Fortune Conservation Area, 45°34'N 74°23'W, sweep, 7.vii.1999, 1 ♀, S. E. Brooks leg. (LEMQ 0040328); Ste-Anne-de-Bellevue, Stoneycroft, 45°25.8'N 73°56.4'W, sweep south end of pond, 2.vii.1998, 1 ♀, J. Savage leg. (LEMQ 0040106); same locality but Stoneycroft Pond, sweep, 5.vii.1999, 1 ♂ (LEMQ 0040313), M. Pollet leg., sweep grass, 2.vii.1999, 1 ♀ (LEMQ 0040470), S. E. Brooks leg.; Terrasse-Vaudreuil, Molson Nature Reserve, 45°23.57'N 73°58.81'W, sweep path in forest, 1.vii.1999, 1 ♀ (LEMQ 0040102), S. Boucher leg., 1 ♀ (LEMQ 0040117), T. A. Wheeler leg.; Wakeneld, 9.vii.1946, 1 ♂ 3 ♀♀, G. E. Shewell leg. (CNCI). UNITED STATES OF AMERICA: ILLINOIS: Champaigne Co., 5.vii.1925, 1 ♀, M. W. Shackleford leg. (CNCI); Urbana, “7/10”.1929, 1 ♂, L. Stewart leg. (AMNH). INDIANA: Lafayette, [-]. vi.1910, 1 ♀, J. M. Aldrich leg. (USNM). MAINE: Chebeag[ue] Island, 17.vii.1962, 1 ♀, A. H. Sturtevant leg. (USNM); Mt. Katahdin, 4.vii.1968, “Abol.”, 1 ♀, D. M. Wood leg. (CNCI); Seal Harbor, 29. vii.1930, 1 ♂ 1 ♀, A. L. Melander leg. (USNM). MASSACHUSETTS: Catoctin, Mt. Park, Chestnut wood, 15.vi.1991, 1 ♂, M. Barták leg. (MBPC); Concord, marsh, 19.vii.1961, 1 ♂ (headless), marshy pond, 27.vii.1961, 1 ♂, W. W. Wirth leg. (USNM); Franklin Co., ~ 0.5 km E Farley, 42°36.16'N 72°25.94'W, sweeps, asters, ferns, Impatiens, Rubus, under canopy, 26.vii.2006, 2 ♂♂ 2 ♀♀, K. N. Barber leg. (CNCI); Petersham, [-]. vii.1926, 1 ♂, A. L. Melander leg. (USNM). MICHIGAN: Baraga Co., 27.viii.1932, 1 ♀, R. R. Dreisbach leg.; Battle Creek, [no date], 1 ♀, J. M. Aldrich leg.; Clare Co., 3.vii.1938, 1 ♂, R. R. Dreisbach leg.; Detroit, 20.vi.1940, 1 ♂ 1 ♀, 7.vii.1944, 2 ♂♂ 1 ♀ (1 ♀ genit. prep.), G. C. Steyskal leg.; Hart, 8.vii.1941, 1 ♂ 1 ♀, C. W. Sabrosky leg.; E. Lansing, 24.vii.1941, 2 ♂♂ 1 ♀, B. Wilson leg.; Houghton Co., 11.viii.1953, 1 ♀, R. R. Dreisbach leg.; Lapeer Co., Deerneld Twp., 4.vii.1947, 1 ♀ (genit. prep.), G. Steyskal leg.; Newaygo Co., 27.vi.1953, 2 ♂♂, R. R. Dreisbach leg. (all USNM); Berrien Co., St. Joseph, 15.vi.1975, 1 ♂, D. D. Wilder leg. (CASC). MINNESOTA: Eaglesnest, 12.vii.1957, 1 ♀, W. V. Balduf leg. (INHS 40,122). NEW HAMPSHIRE: Hanover, 31.viii.1916, 1 ♂, A. H. Sturtevant leg. (USNM); Hillsborough Co., Nashua, Long Hill, 42°42'59"N 71°27'04"W, 20 m, 27–28.vi.2004, 1 ♂ 2 ♀♀, S. D. & A. V. Gaimari leg. (CSCA). NEW JERSEY: Mendham, 4.viii.1926, 1 ♀, A. H. Sturtevant leg. (USNM). NEW YORK: Monroe Co., Churchville, 25.vii.1942, 1 ♀, H. D. Stalker leg. (AMNH); Cold Spring Harbor, L[ong] I[sland], [-].vii.[-], 1 ♂, A. L. Melander leg. (USNM); Essex Co., Keene Valley, 1200', 20.vii.1962, 1 ♂, J. R. Vockeroth leg. (CNCI); Oneonta, 30.v.1935, 1 ♂, H. K.Townes leg. (USNM); Schoharie, Co., 18, 5.vii.1974, 1 ♂, P. Gargiullo leg. (UGCA). OHIO: Portage Co., 4 mi NE Kent, Battaglia Bog, swept from Carex oligosperma, 12.vii.1999, 1 ♀, B. A. Foote leg. (CMNH); 3.0 mi N. Kent, Herrick Fen, 1.viii.1987, 1 ♂, B. A. Foote leg. (CNCI). PENNSYLVANIA: Wilmerding, 13.viii.1921, 1 ♀, Zahrobsky leg. (CLEV). VERMONT: Jay Peak, 2600–3000', 20.vii.1968, 1 ♂, J. R. Vockeroth leg. (CNCI). VIRGINIA: Shenandoah, Big Meadows, 1.vii.1939, 2 ♀♀, 2.vii.1939, 1 ♂, A. L. Melander leg. (USNM). WEST VIRGINIA: Blueneld, 17.vi.1970, 1 ♂, G. Steyskal leg. (USNM). WISCONSIN: Washburn Co., T39N R12W B 28, 23.vi. 1953, 1 ♀, T39N R12W B 32, 20.vi. 1951, 1 ♀, T39N R12W B 32, 25.vi. 1953, 1 ♂ 1 ♀, T39N R12W B 32, 3.vii. 1953, 1 ♂, T39N R12W B 33, 18.vi. 1953, 1 ♀, T39N R13W B 30, 4.vii. 1953, 1 ♂, R. H. Jones leg. (USNM).
Other material examined (not included in type series). CANADA: ONTARIO: Elora, 8.vii.1971, 2 ♀♀, G. A. Surgeoner leg. (DEBU, shrivelled and bleached); Ottawa, 6.vii.1963, 1 ♀, J. R. Vockeroth leg. (CNCI, genit. prep., headless); Sault Ste. Marie, Baseline Rd., 46°31.40'N 84°24.40'W, sweeping, Aster [Doellingeria], Rubus, Equisetum, Carex, Clematis, ferns under aspen (Populus), 7.vii.2010, 4 ♂♂ 1 ♀, J. Roháček leg. (SMOC, 2 ♂♂ 1 ♀ damaged, 2 ♂♂ used for molecular analysis); Sault Ste. Marie, Bristol Place Pk., 46°30.8'N 84°16.6'W, sweeping Impatiens mixed with Clematis, Equisetum, Rubus, ferns, Phalaris, 7.vii.2010, 1 ♀, J. Roháček leg. (SMOC, damaged); Algoma District, Thessalon, 19.vi.1965, 1 ♂, K. P. Butler leg. (LEMQ, headless). QUEBEC: Mont-StHilaire Biosphere Reserve, Pain de Sucre Trail, sweep at brook, 27.vi.2001, 1 ♂ 1 ♀, M. Pollet leg. (LEMQ 0040314, -16, both headless). UNITED STATES OF AMERICA: MICHIGAN: Baraga Co., 4.viii.1937, 1 ♂, R. R. Dreisbach leg. (USNM, beetle damage). NEW YORK: Buffalo, 13.vi.1908, 1 ♀, 27.vi.1908, 1 ♀, M. C. Van Duzee leg. (CASC, both genit. prep., both beetle damage); Ithaca, 8.vii.1907, 1 ♀, [no collector] (INHS 40,161, genit. prep., headless).
Other A. neglecta -group material of questionable identity (Anthomyza sp. cf. dichroa). UNITED STATES OF AMERICA: MICHIGAN: E. Lansing, 20.v.1941, 1 ♀, C. Sabrosky leg. (USNM, missing head & abdomen).
Description. Male. Total body length 2.14–2.74 mm; in external and colour characters (see Figs 1, 401, 402) closely resembling A. variegata including the presence of pale and dark forms (non-sexual dichroism) so that mainly differences against A. variegata are stressed below. Head about as long as high and similarly formed to that in A. variegata, dichroic (Figs 404, 405), in pale form coloured as that of A. variegata, in dark form with not only face, 1st antennal nagellomere and sides of occiput (Fig. 1) brown to dark brown but also mouthparts (palpus in particular) more or less darkened (usually ochreous brown). Occiput slightly concave and coloured as in A. variegata, with silvery white microtomentose spots above foramen developed but often less distinct. Frons largely as in A. variegata; ocellar triangle (at least partly in pale form) brown; frontal triangle of the same form and size as in A. variegata, yellow but more or less distinctly glittering and contrasting with adjacent dull yellow areas of frons. Anterior parts of frons, orbits, frontal lunule, parafacialia and gena as in A. variegata; sometimes anterior frontal area behind antennal bases brownish-darkened (in dark form only). Face in both forms margined by somewhat darker and wider stripe; also ventral marginal stripe of gena usually wider and darker, particularly anteriorly. Mouthparts yellow in pale form but somewhat darkened in dark form. Cephalic chaetotaxy largely as in A. variegata but vte typically distinctly shorter than vti and more curved. Palpus yellow in pale form to ochreous brown in dark form, setose as in A. variegata. Eye ovoid, with longest diameter oblique as in A. variegata and about 1.3–1.4 times as long as shortest. Shortest genal height about 0.13–0.15 times as long as shortest eye diameter.Antenna dichroic as in A. variegata, thus with 1st nagellomere entirely yellow in pale form, or brown (also on inner side) with only basal part yellow in dark form, and with very long marginal pilosity. Arista also as in A. variegata but with cilia shorter (about half length of marginal cilia of 1st nagellomere).
Thorax slightly narrower than head, similarly coloured to that of A. variegata; scutum in pale form yellow with usually distinct pale brown sublateral bands, in dark form more extensively pale brown to greyish brown (Fig. 401) with variably long narrow yellow stripes anteromedially and larger yellow area in front of scutellum, more rarely almost completely brown except for humeral-notopleural area. Dorsum of thorax pale grey microtomentose, not shining. Humeral and notopleural areas yellow in both forms; scutellum normally yellow, in dark form often somewhat darkened on disc to (rarely) pale brown. Pleural part of thorax as in A. variegata, yellow to whitish yellow, with narrow brown (usually darker anteriorly) dorsal band extended from thoracic cervix almost to haltere (Figs 382, 402). Postscutellum usually yellow (rarely, in darkest specimens, brownish), postnotum always darker, pale brown. Thoracic chaetotaxy: 1 hu (longer than posterior npl) plus 1 hu setula; 2 npl (anterior longer than hu, posterior shorter); prs, sa and pa subequal and about as long as hu; 2 long postsutural dc (the weaker anterior longer than anterior npl, posterior longest of thoracic setae) and 6–7 dc microsetae in front of them (the hindmost usually enlarged); 3–4 rows of ac microsetae on suture but only 2 rows between dc; hindmost ac pair usually slightly longer and situated in front to beyond posterior dc; 2 sc, laterobasal weaker and shorter than sa, apical sc slightly shorter and thinner than posterior dc; no additional erect setulae on scutellum; 1 small nne ppl; 2 long stpl (anterior usually slightly shorter) and 3–5 upcurved setulae in dorsal half of sternopleuron (sometimes also 1 in front of anterior stpl seta); its ventral part with a cluster of 6–8 longer setae. Scutellum rounded triangular, slightly nattened dorsally. Legs with colouration and chaetotaxy not particularly different from those of A. variegata. f 1 with ctenidial spine distinctly longer than maximum width of t 1. Fore and hind basitarsus ventrobasally with 2–3 slightly enlarged setulae, also mid basitarsus with 1 longer ventrobasal setula. Wing (Fig. 438) closely resembling that of A. variegata, thus distinctly wider than in A. gibbiger or A. orthogibbus. R 2+3 long, bent subparallel to C with apex very slightly upcurving; R 4+5 and M very slightly bent to almost straight, running parallel to each other. Cell dm long, moderately narrow; r-m usually situated in front of the middle (sometimes in the middle) of cell dm. Apical portion of CuA 1 usually somewhat longer than dm-cu. Alula distinct but narrow. Wing measurements: length 2.02–2.66 mm, width 0.65–0.87 mm, Cs 3: Cs 4 = 1.37–1.87, rm\dm-cu: dm-cu = 2.23–2.83. Haltere yellow to ochreous, with some pale brownish tinge, as in A. variegata.
Abdomen dorsally dichroic in contrast to A. variegata, in pale form light brown-and-yellow variegated (Fig. 382) with posterior brownish stripes small (short), in dark form largely brownish (Fig. 402) or with anterior yellow areas reduced and darkened (brown stripes covering more than half of tergum). Preabdominal terga T2–T5 of pale form yellow to pale yellow with transverse, relatively short (sometimes medially interrupted) brownish posterior band, T1 pale brown with only anterior corner yellow. T2–T5 of dark form largely brownish, but usually anteriorly and laterally pale ochreous to yellow, in darkest specimens almost entirely brown or with somewhat paler margins; T1 as in pale form. T1–T5 subshining, rather shortly and sparsely setose. T1 and T2 separate, only laterally fused. T3–T5 large, subequal in size, T2 usually slightly shorter and more transverse. Preabdominal sterna pale yellow, becoming wider posteriorly, thus of similar shape and size to those in A. variegata but S4 and particularly S5 wider and more transverse. S2–S5 densely setose, only S1 bare and with darker posterior marginal stripe. T6 short, transverse, bare, poorly visible because it is membranous and unpigmented. S6 and S7 yellow, both with brownish anterior marginal ledge; S6 with 2–3, S7 with 2 setae; S8 as long as epandrium, variable in colour, largely yellow and only posteriorly brownish in pale form, or largely brown with only anterior marginal areas yellow in dark form, setose in posterior two-thirds to three-fourths.
Genitalia. Epandrium (Figs 406, 407) pale yellow (contrasting with posteriorly brown S8), moderately long but broad (markedly wider than S8), densely setose, with one or more somewhat longer and thicker setae dorsolaterally; anal nssure larger than in A. variegata, roughly semicircular. Cercus relatively small, as in A. variegata. Medandrium (see Fig. 406) relatively high, in contrast to that of A. variegata dorsally slightly narrowed, with dorsolateral corners rounded and ventrally more deeply emarginate. Gonostylus (Figs 406, 407, 412) of distinctive shape, long but slender, strongly curved medially, with distal half dilated, apically tapered and with 2 teeth on apex (Fig. 412), with micropubescence reduced and restricted to posterobasal area and longer setae mainly along concavity on inner side and at posterior margin (here also proximally). In caudal view (Fig. 406) gonostylus most resembles that of A. paraneglecta (cf. ROHÁĆEK 2006a: Fig. 278). Hypandrium (Fig. 408) medium-sized, with anterior internal lobes small, so resembling other species of the group. Transandrium (Fig. 409) straight, laterally simple, without bulging corners, and with nat caudal process transilient to longer-spinose basal membrane, thus very similar to that of A. variegata but paler-pigmented. Pregonite (Fig. 408) fused to hypandrium, posteriorly with small process carrying 3 setae (shorter than in A. variegata), anteriorly simple, with straight ventral outline and (usually) with 4 (3 short and 1 long) setae. Postgonite (Fig. 408) slender and slightly sinuate in pronle, pale-pigmented, with 1 setula in basal two-nfths, numerous sensillae and rounded apex. Basal membrane (Figs 408, 409) coalesced to narrow ventral end of caudal process and prickly spinose, sharing this feature with A. variegata. Aedeagal part of folding apparatus also similar to that of A. variegata including inconspicuous lenticular armature. Connecting sclerite elongate, slender, well sclerotized and dark-pigmented (particularly dorsally), without spinulae. Phallapodeme moderately robust, relatively pale distally, with basal part forked, fulcrum moderate and pale-pigmented, and distinctly bicuspidate apex. Aedeagus (Fig. 411) with small phallophore as in A. variegata. Saccus of distiphallus most similar to that of A. variegata, membranous, with small basal sclerite attached to nlum and armed with only 8–10 (thus fewer than in A. variegata) robust dark-pigmented spines. Filum robust, similarly formed to that of A. variegata but with dark tooth-like spines along its distal end less numerous and more scattered (Fig. 410). Ejacapodeme reduced to tiny pale sclerite, with slender digitiform projection (see Fig. 411).
Female. Similar to male unless mentioned otherwise. Total body length 2.38–3.49 mm. Dichroism of head reduced, face of both forms yellow as in A. variegata. In pale form inner side of 1st nagellomere is yellow and outer side is pale brown with yellow margins (rarely completely yellow) and occiput is yellow, at most with small lateral brownish darkenings; in dark form inner side of 1st nagellomere is orange yellow with brown margins (mainly dorsally, differing so from A. variegata) and outer side is distinctly brown (except base) and lateral sides of occiput are more or less brown. Brown pattern of thoracic scutum variable as in male, with pale and dark forms. Wing measurements: length 2.56–3.22 mm, width 0.79–1.05 mm, Cs 3: Cs 4 = 1.21–1.53, rm\dm-cu: dm-cu = 2.29–2.90. Abdomen with T2–T6 brown-and-yellow transversely variegated: in dark form posterior brown bands enlarged (rarely T2–T4 almost completely brown), in pale form shortened and sometimes medially interrupted. T2–T5 shorter and more transverse than in male, subequal in size, wider than T6. Preabdominal sterna pale yellow, not narrower than in male and closely resembling those of A. variegata in shape, relative size and setosity.
Postabdomen (Figs 413, 415) relatively long, tapered posteriorly, telescopic, with most sclerites yellow to pale yellow, only T6 and T7+S7 with small brown markings. T6 simple, large (but narrower than T5 as in A. variegata), suboblong with rounded posterior corners, largely yellow but with very short (somewhat longer in dark form) transverse brown stripe at posterior margin (Fig. 413), setose in posterior half with marginal setae longest. S6 transversely subtrapezoidal with anterior corners rounded, broader than S5, pale yellow and nnely, densely (usually less so than in A. variegata) setose. Tergosternum T7+S7 almost as wide as T6, long, conical (posteriorly tapered), dorsomedially shortened (Fig. 413) and weakly sclerotized (although not membranous as in A. variegata), ventrolaterally expanded and forming distinct (smaller than in A. variegata) pouch-like lobes (Fig. 415), yellow, dorsally with small brown posterior stripe being medially interrupted (Fig. 413) being distinctly shorter and not widened laterally as in A. variegata. Dorsal part of T7+S7 with setae only at posterior margin, ventral pale yellow part more densely setose in posterior two-thirds and with distinct dark transverse ledge-like strip behind anterior margin (Fig. 415). 8th segment narrow, micropubescent laterally. T8 yellow, elongate (Fig. 413), markedly narrower than that of A. variegata, narrow also anteriorly, distinctly micropubescent and with nne exclinate setae in posterior two-thirds; S8 (Fig. 415) as in A. variegata but usually narrower. Genital chamber (Figs 417, 418) with pale-pigmented internal sclerotization as in A. variegata formed by 1 pair of poorly denned, nat and crooked (more than in A. variegata) sclerites and 1 suboval, asymmetrical annular sclerite situated anteroventral to the latter. Membranous part of genital chamber also similar but without small grain-like sclerotizations and with more distinct (though poorly sclerotized) ventral plate below insertion of ducts. Ventral receptacle (Fig. 418) tube-like, hyaline, basally distinctly broader as in A. variegata but its terminal part usually with more twisted vermicular apex. Accessory gland as in A. variegata, on distally dilated but indistinctly ringed duct. Spermathecae (1+1) shorter oval (Fig. 416) than those of A. variegata, each with smaller terminal cup-shaped invagination and with minute blunt spinulae situated only around duct insertion; duct very long and ending without distinct cervix in base of spermathecal body. T10 small (Fig. 413), as long as wide, roughly rounded hexagonal, with usual 1 posteromedial pair of long setae and reduced micropubescence. S10 markedly larger and wider than T10, elongately subpentagonal in ventral view (Fig. 415), longer and narrower than in A. variegata, nnely setulose and micropubescent. Cercus slightly longer than that of A. variegata but with similar setosity (Fig. 418).
Discussion. Anthomyza dichroa sp. nov. seems to be the nearest relative of A. variegata, demonstrated by the close resemblance in colouration (of both pale and dark forms occurring in these two species), shape of the head, ciliation of the antenna, broader wings, and male and female postabdominal structures (as given above under A. variegata). This new species essentially differs from all Nearctic relatives by the slender, elongate and strongly medially curved gonostylus with reduced micropubescence (cf. Figs 406, 407), being somewhat similar to that of the European species A. paraneglecta (cf. ROHÁĆEK 2006a: Fig. 278). Despite some resemblance of the gonostylus, A. paraneglecta is likely not closely allied to A. dichroa because it lacks the non-sexual dichroism (a dark form is not known in that species), the prickly spinose caudal process of the transandrium and basal membrane as well as the posterodorsally medially interrupted (membranous) female T7+S7, that is, all apomorphies shared by the A. variegata + A. dichroa sister pair. While the male is easily recognized, identincation of the female of A. dichroa is more difncult, particularly from the externally very similar A. variegata. The best diagnostic female characters can be seen on T7+S7, which has the posterior dorsomedially interrupted stripe distinctly shorter and not widened laterally (in contrast to that of A. variegata), and ventrally there is a distinct dark transverse ledge-like strip behind the anterior margin (Fig. 415); T8 is also different, elongate, and distinctly narrower anteriorly compared to A. variegata (Fig. 413). For other (relatively subtle) differences see the above description.
Etymology. The specinc name is the latinized Greek adjective dichrous (-a, -um), meaning bicolourous, derived from the non-sexual dichroism of the head of this species.
Biology. Anthomyza dichroa often shares forested habitat with the closely related A. variegata where the two overlap, at least in southern Ontario (see Biology of latter species). Similarly, habitats further north in Ontario include those shared with one or both (Fig. 421) of A. gibbiger and A. orthogibbus and/or with other anthomyzids. Habitats also include those where this species was found by itself (Fig. 403) and more often in moist to wet open sites. Host plants are not yet connrmed for A. dichroa, but on a few occasions it has been swept from Carex gynandra Schwein. that occurred either in isolated clumps or mixed with other plants (Ontario: Sault Ste. Marie). Among species in the A. neglecta group, C. gynandra has only yielded A. dichroa, except for a single female of A. orthogibbus collected on the periphery of a site dominated by a pure growth of C. lacustris. Collections from other open habitats have suggested various sedges such as Scirpus microcarpus and S. cyperinus (L.) Kunth as host plants (Ontario: Sault Ste. Marie), and a rather dry roadside site (Ontario: Ponsonby, Poa spp.) shared with A. gibbiger indicates a wider range of habitat (and host plants) is possible. Impatiens capensis is often an indicator of habitat that might yield this and several other species of Anthomyza. The night period is known to run from 30 May (New York: Oneonta) to 25 September (Ontario: Sault Ste. Marie).
Distribution. This species is commonly collected in the northeast, and is perhaps similarly distributed to A. variegata except shifted somewhat north and east. This is the most commonly collected species of this group in eastern Canada. Canada: Manitoba, Nova Scotia, Ontario, Quebec; United States of America: Illinois, Indiana, Maine, Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Vermont, Virginia, West Virginia, Wisconsin (see Table 2).
description: Published as part of Roháćek, Jindřich & Barber, Kevin N., 2016, Nearctic Anthomyzidae: a monograph of Anthomyza and allied genera (Diptera), pp. 1-412 in Acta Entomologica Musei Nationalis Pragae (suppl.) (suppl.) 56 on pages 243-255, DOI: 10.5281/zenodo.4272829