Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 99. (Budapest 2007)

Papp, L.: A review of the Old World Trigonometopini Becker (Diptera: Lauxaniidae)

to have a better approach: let us try whether we are able to find monophyletic (definitely related) groups of the genera. We may name them as tribes, as it is in the case with Trigonometopini BECKER, 1905. This is not the beginning of the proposed process: SASAKAWA (1995: 150) named Noonamyiini earlier. The family group taxon based on Trigonometopus MACQUART, 1835 is Trigonometopinae BECKER, 1905, who created the subfamily within Heteroneuridae (now Clusiidae). There is no reason why not fasten the taxon on BECKER's action (as a tribe here). In view of the richness of the Oriental lauxaniid fauna, also this tribe is rich in species indeed, particularly so for the genus Tetroxyrhina. In this paper a part of the new species will be described only. In descriptions we follow SINCLAIR'S (2000) terminology. The name "protandrium" is used mostly for tergite 7. SHEWELL's (1987) concept of surstylus seems highly questionable; the ventral lobe of epandrium is called here as surstylar lobe. The types and specimens of the other species below are deposited in the Diptera Collection, Department of Zoology, Hungarian Natural History Museum, Budapest (below: HNHM), in the Muséum d'Histoire naturelle Genève (below: MHNG), or in the Taiwan Forestry Research Institute, Taipei (below: TFRI). Trigonometopini BECKER, 1905 Remarks - The family group name Trigonometopinae was erected by BECKER ( 1

905:41 ), so I regard the tribe as Trigonometopini BECKER, 1905 (cf. SABROSKY 1999: 314). Characterisation - The tribe can be characterised within the subfamily Lauxaniinae as follow: Body yellow, ochre, seldom dark (S. okinawanus SASAKAWA, 1998). Head elongated, in most genera longer than high. Broad, setose fronto-orbital plates present (a strong synapomorphy of the tribe). Anterior orbital seta reclinate, inclinate or absent. Ocellar setae mostly absent or minute, seldom strong (Neotrigonometopus MALLOCH). Postocellars normal, minute or absent. Cheek and gena without a separate row of setae (except in Luzonomyza MALLOCH). Facial keel distinct or not developed. Scape with or without a strong ventroapical seta. First flagellomere various: short and rounded or long with sharp apex. Thorax more or less elongated. Posthumeral setae present or absent. 0-1 + 2-3 dorsocentral pairs (the consequence of the fact whether anterior dc emerge anteriorly or posteriorly to suture). One or 2 pairs of katepisternals. Acrostichals absent, two-seriate, four-seriate or present in two, not well orJ dered, rows. Wings clear or with diffuse brown spots. Stronger costal fringe restricted to a short proximal part of the R2+3 - R4+5 section, or, this section is completely free of stronger fringe. Abdomen never much flattened. Tergite 7 ("protandrium") fused to epandrium, at least centrally, this is one of the most important synapomorphies of the tribe. In cases tergite 6 also fused to tergite 7 centrally (Fig. 45). Male genitalia surprisingly uniform: no surstylus or distinct