Ophiomyia virginiensis Spencer

Figs 411, 412

Ophiomyia virginiensis Spencer in Spencer and Steyskal 1986b: 260.

Description.

Wing length 2.2 mm (♂), 2.5 mm (♀). Length of ultimate section of vein M4 divided by penultimate section: 1.0. Eye height divided by gena height: 8.2. Facial carina distinct with large medial bulb (strongly furrowed medially, shiny on dorsal 1/2), not narrowed above bulb. Eye angled diagonally. Gena strongly produced anteriorly, forming an ~ 60° angle (slightly larger angle in specimens from Turkey Run). Clypeus strongly produced and narrowed anteriorly. Crossveins separated by less than length of dm-m.

Chaetotaxy: Male vibrissal fasciculus thick and upcurved, ~ 2/3 length of gena. Two ori; two ors. Mid tibia with one posteromedial seta.

Colouration: Body, including halter dark brown. Wing veins brown. Calypter margin and hairs dark brown. Abdomen with coppery/golden shine.

Genitalia: (Figs 411, 412) Metepiphallus pale and narrow with one pair of ventrobasal spines. Epiphallic lobes evenly dark. Halves of basiphallus fused at base with remainder of left sclerite highly reduced and ill-defined; right sclerite narrow and elongate, exceeding base of distiphallus. Mesophallus base not exceeding that of distiphallus. Distiphallus divided into a large, rounded subtriangular basal lobe, and a slightly narrower distal section that is nearly parallel-sided and compressed dorsoventrally, with a more densely spinulose basal chamber, several sclerotised ventromedial ridges and an internal tubule. Ejaculatory apodeme large, broad, relatively evenly pigmented and without medial rib.

Host.

Unknown.

Distribution.

USA: VA.

Type material.

Holotype: USA. Virginia: Hawksbill, Shenandoah N.P., 3600-4050', 7.vi.1962, J.R. Vockeroth (1♂, CNC).

Additional material examined.

USA. VA: Fairfax Co., Turkey Run Park, nr. mouth of Turkey Run, 38°57.9'N, 7°09.4'W, Malaise trap, 23.viii-18.ix.2007, D.R. Smith (1♂ 3♀, USNM)

Comments.

Ophiomyia virginiensis can be characterised by a strongly pronounced furrow on the facial bulb, the ultimate and penultimate sections of M4 are equal in length, the basiphallus is mostly composed of a single narrow band, and the distiphallus is large with discrete sections, including a high, internally smooth subtriangular basal section.