Ophiomyia capitolia, Lonsdale, 2021

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

Ophiomyia capitolia sp. nov.

Figs 332-336

Description.

Wing length 1.7 mm (♂). Female unknown. Length of ultimate section of vein M4 divided by penultimate section: 0.8. Eye height divided by gena height: 6.2. Eye slightly angled diagonally. Facial carina stout, slightly more narrow than stout bulb. Gena shallowly produced, projecting at 60° angle with margins straight. Clypeus narrow and truncated. Buccal cavity narrowed anteriorly with anterior margin straight. Distance between crossveins more than length of dm-m. Ocellar triangle and fronto-orbital plate (narrow) subshiny and ill-defined.

Chaetotaxy: Male with vibrissal fasciculus ~ 1/2 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 brown.

Genitalia: (Figs 332-336 ) Metepiphallus small, pale and with one pair of ventromedial spines. Epiphallic lobes clear with dark floating sclerite. Halves of basiphallus broadly fused at base with remainder of left sclerite absent; right sclerite relatively short and truncated with long distoventral process reaching venter. Mesophallus continuing distally as thick ridge that bifurcates apically; distiphallus pale and globular with inner surface minutely spinulose. Ejaculatory apodeme with long dark stalk and several annulations on striated blade; sperm pump with weak sclerotisation.

Host.

Unknown.

Distribution.

USA: DC.

Etymology.

The specific name refers to the fact that the type was collected in the United States capitol.

Type material.

Holotype: USA. DC: Washington, 17.viii.1913, A.L. Melander (1♂, USNM).

Comments.

Ophiomyia capitolia is one of the smaller Delmarva Ophiomyia with a male wing length of 1.7 mm. This species also has a distinct genal process, a long fasciculus and a relatively distinct wrinkle under the eye within the cheek. Only examination of the male genitalia can provide reliable identification of this species (see key).

Figures

Figures 332 - 336. Ophiomyia capitolia Lonsdale, sp. nov., male genitalia 332 ejaculatory apodeme 333 external genitalia, ventral 334 hypandrium, ventral 335 hypandrial complex, left lateral 336 phallus and proepiphallus, ventral.