O. Merkl szerk.: Folia Entomologica Hungarica 66. (Budapest, 2005)

Female fore tarsomeres all dark. Tergite 7 and sternite 7 rather long and completely fused. Postabdomen hidden under those sclerites. Cerci extremely short with short thin setae. Four (!) long spermathecae, their apex rounded, right pair seem longer than left pair. Remarks - Owing to its wing pattern T. margo sp. n. keys to T: marginella in HACKMAN's (1970) key. And indeed, the closest relative of the new species is T. marginella (MEIGEN, 1823). A couple of body characteristics make them easily separable, Otherwise details of male genitalia show also distinctive features. The two species are easily separable using the following key. 1 Distal section of vein M much (up to 1.5 times) longer than penultimate section. Anal vein shorter, straight or hardly discernible. Gena narrower, distance between anterior pm-s and eye margin not broader than width of 1

st flagellomere. Acmi less numerous, only two-serial behind the middle dc pair. Dorsal surface of preabdominal terga subshining dark (black or dark brown), contrasting grey dusted lateral margins. Male genitalia: Epandrium slightly shorter, surstylus (Fig. 18) shorter and less curved than in T. margo. Right lamella of distiphallus (Fig. 19) not much curved apically, medial process shorter and less sharp, than in T. margo, apical thorn of gonopod thinner. In the HNHM 57 males, 67 females from Hungary Trixoscelis marginella (MEIGEN, 1823) Distal section of vein M subequal (or only slightly longer) than penultimate section. Anal vein longer, arched, clearly discernible. Gena broader, distance between anterior pm-s and eye margin definitely broader than width of l

sl flagellomere. Acmi more numerous, continued to be four-serial behind the middle dc pair. Dorsal surface of preabdominal terga concolorous with lateral margins (dark grey). Male genitalia: Epandrium slightly longer, surstylus (Fig. 22) longer and more curved than in T marginella. Right lamella of distiphallus (Fig. 19) much curved apically, medial process large and sharp, apical thorn of gonopod thicker Trixoscelis margo sp. n. * Acknowledgements - It is my duty to express my most sincere thanks to Dr IAIN M ACGOWAN (Scottish Natural Heritage, Battleby, Scotland, UK), for his identification of a number of Lonchaea specimens from the HNHM collection, including representatives of species new to our fauna. I am grateful to Dr BERNHARD MERZ (Muséum d'Histoire naturelle Genève, Suisse) for his advice. This research was supported by the National R&D Programme, title: The origin and genesis of the fauna of the Carpathian Basin: diversity, biogeographical hotspots and nature conservation significance; contract no: 3B023-04.