Lonchaea gachilibong
Description : Male : Head : Eyes sparsely covered with short pale hairs which, in length, are slightly less than the width of the anterior ocellus. Frons narrowing steadily from the level of the ocellar triangle to a point just above the antennal bases at which point it is 40% of the width of an eye, subshining black with long frontal and interfrontal setulae many of which are half the length of the orbital setae. Anterior margin of the frons with a median notch extending up the frons. Orbital plate shining and bare. Lunule with approximately eight setulae, moderately silvered. Face and parafacials also moderately silvered. Anterior genal setulae in a single row of five to six along the mouth margin, none of these markedly stronger than the other setulae on the genae. Antennal flagellomere black with an orange spot basally on the inner margin, short, one and a half times as long as it is deep. Arista black with short pubescence which is only as long as the arista is wide
Thorax : Disc and pleurae brightly shining, disc covered with setulae which are one third as long as the orbital setae. Anepisternum with three anterior setae, but these weak and difficult to distinguish from the other setulae on the sclerite, posteriorly with four slightly stronger setae. Katepisternum with one setae, with setulae present below it and posterior to it. One propleural and two stigmatical setae. Scutellum on margin with five setulae on each side between the apical and lateral setae, these long about half the length of the setae, some creeping onto the edge of the disc, four setulae between the apical setae. Squamae pale with pale margins and fringes. Wings clear, veins yellow. Wing length 3.5mm. Intercostal space twice that of crossvein r-m. Legs : black but with basal and second tarsomeres clear yellow.
Male genitalia : Fig. 2; 3,4,5. In lateral view epandrium only slightly wider than it is high, convex ventrally and with only a small, blunt apical process, along posterior margin bearing two long setulae, ventral to these and along the ventral margin with a fringe of shorter setulae, a few setulae on the surface of the epandrium at the posteroventral corner. Cerci small, only about one quarter the height of the epandrium, emerging from the epandrium on the ventral half of the posterior margin, not chitinised and bearing only a few relatively short setulae apically with a row of longer ones present parallel to the posterior margin. Surstyli not projecting beyond the shell of the epandrium. In ventral view surstyli with outer margins emarginate posteriorly, entire margin with a row of short setulae, no strong spicules present on the inner surface of the surstyli. Aedeagus two segmented, apical segment very short and rectangular, basal portion with a broad, square base and a straight apical part almost as long as the depth of the basal part.
Differential diagnosis : This is a small rather hairy species which with a single row of anterior genal setulae, pale squamal fringe, partly pale tarsomeres and bare orbital plate shows some affinities with European species such as Lonchaea collini Hackman, 1953 and L. nitidissima Kovalev, 1978. the presence of two stigmatical setulae and the characteristic male genitalia do however serve to distinguish this species from other similar Lonchaea species.
TYPE MATERIAL : Holotype male. SOUTH KOREA; 750-900m, Gangwon-do, Hongcheon-gun, Mt. Gachilbong, 37°52’N, 128°28’E, 17.vi.2005, Merz, Choi, Lee & Hwang leg. Forest.