Description :. Holotype male: Head; Eyes densely pilose with dark hairs these almost as long as the depth of the antennal flagellomere. Frons covered in long dense frontal and interfrontal setulae amongst which the orbital setae is scarcely discernable. Orbital plate bearing five to six of these long setulae. Frons narrowing slightly from level of ocellar triangle to antennal bases where it is approximately half the width of an eye, centrally with a broad stripe of silver dusting which extends 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 pollinosity. Anterior genal setae numbering about twelve on each side, partly in single rows and partly in double rows. Palps black with strong setulae at apex and along the inner margin. Antennal flagellomere all black, about 1.8 times as long as it is deep, arista also all black with microscopic setulae.
Thorax; disc subshining, bearing rather sparse long setulae which are approximately half the length of the orbital setae. Sides of thorax subshining, anepisternum with apparently no strong anterior setae but with five strong posterior setae, the remainder of the sclerite covered in moderately dense, long setulae which are almost as long as the posterior setae. Katepisternum bearing one strong setae with a few setulae lying posterior to it, also with long setulae on its upper portion anterior to the setae. One propleural and seven to eight rather strong stigmatical setae. Anepimeron bare, Notopleural depression bare of setulae. Scutellum on margin with five to eight setulae in multiserial rows on each side between the apical and lateral setae, four setulae present between apical setae again multiserial and extending onto margins of the scutellar disc. Squamae pale with a pale fringe of uniform length. Legs entirelly 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 but with margins shining, relatively long haired.
Male genitalia : Fig. 3; 4,5,6. In lateral view, epandrium rather diamond shaped, almost as tall as it is wide with a pointed process anteriorly, a few long setae present on the posterior margins. Cerci not strongly sclerotised, almost rectangular in shape with a row of short setulae along the 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 the height of the epandrium, two segmented, the basal part a very broad U-shape, the 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 aimk, 11km OSO von Somon bajanzogt, 1600m, 13.vi.68, leg. Dr. Z. Kaszab.
Paratypes : 4 other males with the same data. Specimens in the Hungarian Natural History Museum, Budapest.