Lonchaea gachilbong, Introduction & Fallén & Morge, 2007

Introduction, Iain, Fallén, Lonchaea & Morge, Setisquamalonchaea, 2007, New pecies of Lonchaeidae (Diptera: Schizophora) from Asia, Zootaxa 1631, pp. 1-32 : 6-7

Lonchaea gachilbong sp. nov.

Description: Holotype male: Head: Eyes sparsely covered with short pale hairs which, in length, are slightly less than width of anterior ocellus. Frons narrowing steadily from level of ocellar triangle to a point just above antennal bases at which point it is 40% eye width, subshining black with long frontal and interfrontal setulae many of which are half the length of orbital setae. Anterior margin of the frons with a median notch extending slightly dorsally 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 single row of 5–6 along mouth margin, none of these markedly stronger than other setulae on genae. Antennal flagellomere black, basally with an orange spot on inner margin, short, one and a half times as long as deep. Arista black with short pubescence 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 orbital setae. Anepisternum with three anterior setae, these weak and difficult to distinguish from other setulae on sclerite, posteriorly with four slightly stronger setae. Katepisternum with one setae, with setulae present ventrally and posteriorly to it. One propleural and two stigmatical setae. Scutellum on margin with five setulae on each side between apical and lateral setae, these long about half length of setae, some creeping onto the edge of the disc, four setulae between 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 all black but basal and second tarsomeres clear yellow.

Male terminalia: Figs. 9–11. In lateral view epandrium only slightly wider than high, convex ventrally and with only a small, blunt apical process, along posterior margin bearing two long setulae, ventral to these and along ventral margin with a fringe of shorter setulae, a few setulae on surface of the epandrium at the posteroventral corner. Cerci small, only about one quarter height of epandrium, emerging from the epandrium on ventral half of the posterior margin, not chitinised and bearing only a few relatively short setulae apically, a row of longer ones present parallel to posterior margin. Surstyli not projecting beyond the shell of the epandrium. In ventral view surstyli with lateral margins emarginate posteriorly, entire margin with a row of short setulae, no strong spicules present on the inner surface of 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 depth of 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 to European species such as Lonchaea collini Hackman, 1953 and L. nitidissima Kovalev, 1978 . The presence of two stigmatical setulae and characteristic male terminalia 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.

Only known from the holotype in the YSUW .

Etymology. The specific epithet refers to the location of capture of the holotype