Melanagromyza subvirens (Malloch)

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 subvirens (Malloch)

Figs 301-304

Agromyza subvirens Malloch, 1915a: 105.

Melanagromyza subvirens . Frick, 1959: 366; Spencer and Steyskal 1986b: 26.

Description.

Wing length 2.8-3.2 mm (♂), 3.4-3.5 mm (♀). Length of ultimate section of vein M4 divided by penultimate section: 0.5-0.6. Eye height divided by gena height: 5.0-5.5. Gena highest at ~ anterior 1/3, angled upwards anteriorly, with distinct cheek. Fronto-orbital plate well-developed, slightly visible laterally, setae slightly inset. Clypeus broadly rounded. Fronto-orbital plate and ocellar triangle slightly less matt than surrounding frons. Ocellar triangle reaching second ori from rear.

Chaetotaxy: Five to six fronto-orbitals with posterior one or two reclinate (ors). Ocellar setulae short, reclinate, in two irregular rows. Eye sparsely pilose dorsomedially, sometimes slightly denser in male. Anterior genal seta sometimes vibrissa-like. Two dorsocentral setae; MD male with third dorsocentral on left side. Acrostichal setulae in eight irregular rows. Mid tibia with two posteromedial setae.

Colouration: Body, including halter, dark brown in base colour; female darker, blackish. Scutellum with faint greenish shine in male, female sometimes with bluish tint. Calypter margin and hairs white. Abdomen with green or bluish green shine, and females sometimes with strong blue shine only. Slightly reddish, at least on antenna and gena, and sometimes more widespread.

Genitalia: (Figs 301-304 ) Epandrium with small posterodistal spine. Surstylus ~ 1/2 length of epandrium venter (epandrium dorsum shallower); inner surface with several irregular rows of tubercle-like setae. Hypandrium subtriangular with slightly produced apex. Metepiphallus with serrated ventral and lateral ridges. Proepiphallus V-shaped. Basiphallus forming complete ring with ventrodistal margin ill-defined. Distiphallus separated from phallophorus by height of basiphallus; mesophallus slightly exceeding base of distiphallus; distiphallus relatively flat, with internal spinulose pads, strongly upturned and apically widened dorsoapical membranous process; ventrolateral tubules short. Ejaculatory apodeme well-developed with short stem and narrow rib slightly exceeding apex of broad, pale, ovate blade.

Host.

Unknown.

Distribution.

USA: IA, IL, MD*, NC*, PA, VA.

Type material.

Holotype: USA. IL: St. Joseph, 17.v.1914, C.A. Hart and J.R. Malloch (1 ♀, INHS). [Not examined].

Paratype: USA. IL: St. Joseph, 17.v.1914, Salt Fork (1♀, USNM).

Material examined.

USA. IL: Oregon, 21.vi.1917, en copulae; CNC358452 (1♂ 1♀, CNC), MD: Laurel, 1.vi.1965, Malaise trap, CNC358454, CNC358455, CNC358456 (3♀, CNC), nr. Plummers Isl. , 2.v.1915, R.C. Shannon (1♀, USNM), Montgomery Co., Bethseda, 26.v.1968, G. Steyskal (1♂, USNM), NC: Wilson’s Gap, 944 m, 25.v.1957, J.R. Vockeroth, CNC358453 (1♂, CNC) .

Figures

Figures 301 - 304. Melanagromyza subvirens (Malloch), male genitalia 301 hypandrium, ventral 302 external components, left lateral 303 hypandrial complex, left lateral 304 phallus and proepiphallus, ventral.