Phytoliriomyza melampyga (Loew)

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

Phytoliriomyza melampyga (Loew)

Figs 129 , 705-710

Agromyza melampyga Loew, 1869: 48.

Agromyza impatientis Brischke, 1881: 245. Spencer 1969 [synonymy].

Liriomyza impatientis . Hendel, 1931: 225.

Liriomyza melampyga . Frick, 1952a: 404, 1957: 203 [lectotype designation]; Spencer 1969: 178; Shewell 1953: 467.

Phytoliriomyza melampyga . von Tschirnhaus, 1971: 562; Spencer and Steyskal 1986b: 157; Černý 2018: 131; Scheffer and Lonsdale 2018: 87; Černý et al. 2020: 200.

Description

(Fig. 129 ). Wing length 2.1-2.4 mm (♂), 2.0-2.5 mm (♀). Length of ultimate section of vein M4 divided by penultimate section: 1.3. Eye height divided by gena height: 3.7-4.3. Eye bare. Vein r-m at midpoint of cell dm or beyond.

Chaetotaxy: Two to three ori; two ors. Orbital setulae reclinate and well-developed, in one row. Postocellar and ocellar setae well-developed, longer than ors. Four dorsocentrals, one presutural, decreasing in length anteriorly. Acrostichal setulae in four irregular rows.

Colouration: Head light yellow with ocellar tubercle light brown to yellow and back of head brown above foramen excluding margins. Thorax mostly light yellow with light greyish pruinosity evident on pigmented sections; scutum with medial stripe on anterior 2/3 that is sometimes confluent with one pair of lateral presutural spots; postsuturally with one very narrow pair of floating supra-alar stripes posteriorly and one pair of wider intra-alar stripes that taper posteriorly and sometimes fuse to presutural spot; pattern sometimes enlarged with stripes extensively fused, encompassing all but lateral and posterior margins of scutum. Scutellum yellow, sometimes with lateral corner brownish. Metanotum yellow with mediotergite dark brown and anatergite and katatergite variably brown posteroventrally. Pleuron yellow with meron brown excluding dorsum, and katepisternum with large brown spot that does not reach base of seta. Halter entirely white. Calypter margin and hairs brown. Legs yellow with tibiae dark yellow to brownish. Abdomen light yellow with at least sides of epandrium brown; sometimes with faint paired brownish spots on pregenital tergites.

Genitalia: (Figs 705-710 ) Epandrium with broad anterior emargination basal to fused surstylus; posteromedial margin with comb of long tubercle-like setae. Surstylus subquadrate, only slightly converging and with posteromedial margin with comb of long tubercle-like setae; outer surface bare, inner surface setose. Subepandrial sclerite bare and subrectangular with centre paler and corners produced; ventrally with one pair of dark narrow arms and shallow rounded medial process. Hypandrium bare, long, and thin with only margin of lobe sclerotised. Postgonite rounded and cleft apically. Basiphallus consisting of single dark elongate rod on left side, Mesophallus cylindrical, widest at base, which is 1/2 length. Distiphallus made up of one pair of stout, clear, elongate tubules that are laterally pigmented subbasally. Ejaculatory apodeme small and dark with base stout and blade highly reduced; sperm pump clear.

Distribution.

Canada: AB*, NB*, NS*, ON, PE*, QC*, SK*. USA: DC, MA, MD, MI, NC*, NJ, NM*, NY, PA*, VA*, MN, WI. Europe, India, Kazakhstan, Russia, South Korea ( Černý et al. 2020).

Hosts.

Balsaminaceae - Impatiens .

Type material.

Lectotype [melampyga]: USA. DC [not given]: "Loew coll.; melampyga m." (1♀, MCZ). [Not examined]

Syntype [impatientis]: Poland. Gdansk (as “Oliva”) [type information unknown]. [Not examined]

Material examined.

Canada. AB: Elk Island NP, Wood Bison Trail, 53°34'N, 112°50'W, 722 m, aspen forest, 2.vii.2012, BIOBus, CNC391917 (1♂, CNC), NB: Shediac, 8.vii.1967, N.L.H. Krauss (♂, USNM), NS: CBHNt. Pk., Beulach Ban Falls , along fast rocky stream, 11.vii.1983, J.R. Vockeroth, sweeping, PG812870 , CNC479986 (1♂, CNC), ON: Cyrville Road, 2mi E Ottawa, 31.v.1965, B.V. Peterson, CNC479985 (1♀, CNC), Elizabethtown, 4452 Rowsome Rd. , 44°37'N, 76°16'W, 120 m, 2.vi.2010, James Sones, CNC391918 (1♂, CNC), 4.vi.2010, CNC391919 (1♀, CNC), Grand Bend, 14.vii.1939, G.E. Shewell, CNC391929 (1♀, CNC), Ottawa , Black Rapids, 28.vi.1959, J.R. Vockeroth, CNC479983 (1♂, CNC), Ottawa , Dow’s Swamp, 5.vii.1947, W.R.M. Mason, CNC391930, CNC391926 (1♂ 1♀, CNC), Ottawa , 20.vii.1963, J.R. Vockeroth, CNC391908 (1♀, CNC), 28.vi.1953, J.R. Vockeroth, CNC391909-391914 (4♂ 2♀, CNC), 27.vii.1946, A.R. Brooks, CNC391931 (1♀, CNC), 8.viii.1946, G.E. Shewell, CNC391932, CNC479984 (2♀, CNC), Puslinch, Property of Bob Hanner , 43°27'N, 80°15'W, 335 m, hardwood forest, 18.ix.2008, T. Terzin, CNC391924 (1♂, CNC), 21.viii.2008, CNC391920 (1♀, CNC), 28.viii.2008, CNC391922 (1♀, CNC), 3.viii.2008, CNC391921, CNC391923, CNC391925 (1♂ 2♀, CNC), St. Lawrence Is. Nat. Park , Thwartway Is., 13.vii.1976, H.J. Teskey, Code - 4073Q, CNC391927 (1♂, CNC), PE: Charlottetown, vii.1967, N.L.H. Krauss (1♂, USNM), QC: Abbotsford, 18.v.1936, Shewell, CNC391928 (1♀, CNC), Beech Grove, 7.vi.1955, J.F. McAlpine, CNC479982 (1♀, CNC), Gatineau Hills, in park, King Mt. footpath, 30.vii.1959, L.K. Smith, CNC391906 (1♂, CNC), Old Chelsea, 11.viii.1959, C.H. Mann, CNC479980 (1♂, CNC), 25.vi.1959, J.G. Chillcott, CNC391907 (1♀, CNC), Rigaud, 11.vi.1981, J.R. Vockeroth, CNC479981 (1♂, CNC), SK: Prince Albert NP, Narrow Penninsula Trail, 53°59'N, 106°17'W, 530 m, white spruce and poplar forest, 14.vii.2012, BIOBus, CNC391916 (1♂, CNC) . USA. MA: Bedford, 20.vii.1961, swamp, W.W. Wirth (3♂ 2♀, USNM), Woods Hole, “7-15-2”, A.L. Melander (1♀, USNM), MD: Plummers Isl., 30.v.1913, R.C. Shannon (1♀, USNM), Glen Echo, 9.vii.1922, J.R. Malloch (1♀, USNM), Montgomery Co., Bethseda, G.C. Steyskal, 29.vii.1972 (1♂, USNM), 23.v.1970 (2♂, USNM), 17.v.1969 (1♂, USNM), 4.vii.1977 (1♂, USNM), Dickerton , 14.vii.1974, G.A. Foster (2♂ 1♀, USNM), Sometset Co. , Snow Hill , 16.vii.1968, swamp margin, W.W. Wirth (2♂ 1♀, USNM), MI: Clinton Co. , Rose Lake , 24.v.1941, C. Sabrosky (1♀, USNM), NC: Gr. Smoky Mt. Nat. Pk. , Clingman's Dome , 1920-2024 m, 18.vi.1957, J.R. Vockeroth, CNC479987 (1♂, CNC), Gr. Smoky Mt. Nat. Pk. , Indian Gap , 1584 m, 2.vii.1957, J.R. Vockeroth, CNC479988 (1♀, CNC), Mt. Mitchell , 2072 m, 12.viii.1957, J.G. Chillcott, CNC479989 (1♀, CNC), NM: Cloudcroft , 9000', June, W. Knaus (1♂, USNM), NY: New York, 28.ix.1921, A.H. Sturtevant (1♂, USNM), Long Island , Cow Neck , 24.v.1963, spring seep, W.W. Wirth (1♀, USNM), Erie Co. , E Concord Bog, 1.vi.1963, maple swamp, W.W. Wirth (1♀, USNM), PA: Chester Co. , Oxford , 127 West Locust , 29.ix.1998, Malaise trap, RLS, 26-iix, 6-ix (1♂, USNM), VA: Shenandoah , Big Meadows , 15.vi.1941, A.L. Melander (3♂, USNM), Fairfax Co. , Dead Run, R.C. Shannon, 19.vi.1915 (1♂, USNM), 28.vii.1915 (1♀, USNM) .

Comments.

Phytoliriomyza melampyga is a distinct bright yellow species that is encountered with relative frequency around Impatiens . Liriomyza blechi is similar in external appearance, but the pregenital abdomen is brownish dorsally, not entirely yellow or with faint spots. Also similar is the Canadian P. viciae (Spencer) ( Spencer 1969: figs 346, 347), which has a darker phallus that is more stongly arched and with a single elongate black basal section (not two smaller, paler sections), and only a few single spines on the epandrium; externally, tergites 1 and 2 are mostly brown in the male and some females, ground colour is yellow, not yellow to whitish yellow, the orbital setulae are indistinct, and most diagnostically, there are two rows of acrostichal setulae (not four).

Figures

Figures 124 - 130. Phytobia setosa (Loew) 124 head, anterior 125 lateral 126, 127 Phytoliriomyza arctica, female 126 head, anterior 127 lateral 128 Phytoliriomyza pacifica (Melander) 129 Phytoliriomyza melampyga (Loew), male, lateral 130 Pseudonapomyza sp., lateral.

Figures 705 - 710. Phytoliriomyza melampyga (Loew), male genitalia 705 external genitalia, posterior 706 external genitalia, ventral (subepandrial sclerite shaded) 707 external genitalia, left lateral 708 hypandrium and postgonite, ventral 709 hypandrial complex, left lateral 710 phallus, ventral.