Lonchaea mongolia, Introduction & Fallén & Morge, 2007

Introduction, Iain, Fallén, Lonchaea & Morge, Setisquamalonchaea, 2007, New pecies of Lonchaeidae (Diptera: Schizophora) from Asia, Zootaxa 1631, pp. 1-32 : 9-10

Lonchaea mongolia sp. nov.

Description: Holotype male: Head: Eyes densely pilose with dark hairs almost as long as depth of antennal flagellomere. Frons covered in long dense frontal and interfrontal setulae amongst which the orbital setae are scarcely discernible. Orbital plate bearing five to six long setulae. Frons narrowing slightly from level of ocellar triangle to antennal bases where it is approximately half eye width, centrally a broad stripe of silver dusting extending up the frons around the edges of the ocellar plate. Lunule silvered with two to three short setulae on each side near the upper margin. Face and parafacials covered in dense silver dusting. Anterior genal setae numbering about twelve on each side, partly in single rows and partly in double rows. Palpi black with strong setulae at apex and along the inner margin. Antennal flagellomere all black, about 1.8 times as long as deep, arista also all black bearing microscopic setulae.

Thorax; disc subshining, bearing rather sparse long setulae approximately half the length of orbital setae. Sides of thorax subshining, anepisternum with apparently no strong anterior setae, with five strong posterior setae, remainder of the sclerite covered in moderately dense, long setulae almost as long as posterior setae. Katepisternum bearing one strong setae with a few setulae lying posterior to it, also with long setulae on its dorsal part anterior to the setae. One propleural and 7–8 rather strong stigmatical setae. Anepimeron bare. Notopleural depression without setulae, only two strong setae present. Scutellum on margin with 5–8 setulae in multiserial rows on each side between apical and lateral setae, four setulae present between apical setae also multiserial and extending onto margins of scutellar disc. Squamae pale with pale fringe of uniform length. Legs entirely black. Wings clear with yellow veins, intercostal space 1.5 times the length of crossvein R-M. Wing length 4.0mm.

Abdomen with tergites rather heavily dusted on central portion, margins shining, relatively long haired.

Male terminalia: Figs. 15–17. In lateral view, epandrium rather diamond shaped, almost as tall as wide with a pointed process anteriorly, a few long setae present on posterior margins. Cerci not strongly sclerotised, almost rectangular in shape, a row of short setulae along posterior margin. Surstyli broadly projecting beyond the margin of the epandrium posteroventrally. In ventral view surstyli with an irregularly toothed margin which bears a row of short setulae, inner margin with a row of very fine short setulae. Aedeagus large and stout, in total exceeding height of epandrium, two segmented, the basal part a very broad U-shape, apical part a simple tube.

Differential diagnosis: This species with its hairy eyes, partly multiserial anterior genal setulae, multiple stigmatical setulae and black legs shows affinities with other Palearctic species such as L. fraxina MacGowan & Rotheray, 2000 and L. iona MacGowan, 2001 but in this species the squamal fringe is pale and the aedeagus, although two segmented, has the apical portion just as long as the basal.

TYPE MATERIAL: Holotype male. MONGOLIA: Central aimak, 11km OSO von Somon Bajanzogt, 1600m, 13.vi.68, leg. Dr. Z. Kaszab.

Paratypes: 4 other males with the same data, all specimens in the HNHM .

Etymology. The specific epithet refers to the country of origin of the specimens.