New Species In The Genus Thagria Melichar From The Oriental And Australian Regions With A Revised Key To Genera And Species And A Synoptic Catalogue Of The Genus Hemiptera Cicadellidae Coelidiinae

The following 21 new species of Thagria from the Oriental and Australian regions are described, illustrated and photographed: T. aenigmatis, sp. nov., T. asperitas sp. nov., T. biretrorsa sp. nov., T. colorata, sp. nov., T.coniunctionis, sp. nov., T. constanti, sp.nov., T. fidelitas sp. nov., T. freytagi sp. nov., T. intorta sp. nov., T. iuxta, sp. nov., T. lobata sp. nov., T. longicatilla sp. nov., T. malenovskyi sp. nov., T. oldfieldi, sp. nov., T. paraunca, sp. nov., T. quadrimaculata, sp. nov., T. quadrispinosa sp. nov., T. trimaculata sp. nov., T. unibasispinosa, sp. nov.; T. unica sp. nov. and T. viraktamathi, sp. nov. Thagria bidentata Xu & Kuoh 1998, preoccupied by Thagria bidentata Nielson 1982 is renamed herein Thagria xui nom. nov. Thagria multicalcara Nielson is suppressed junior synonym of Coelidia inscripta Walker. Thagria hongdoensis Kwon & Lee is suppressed junior synonym of resurrected Coelidia satsumensis Matsumura. Cambodia is a new record for T. longistyla Freytag. Laos is a new record for T. acrodens Freytag, T. boulardi Nielson, T.emeiensis Zhang, T. fuscoscuta Zhang, T. janssoni Nielson, T. obrienae Nielson and T. ungulata Nielson. Vietnam is a new record for T. grandis Nielson and T. marissae Nielson. Intra-inter specific variation involving 6 closely related species (melichari species complex) in Southeast Asia is discussed. Morphology and taxonomic value of the dorsal connective, revised key to species and genera in Thagriini and an updated synoptic catalogue of the genus are also presented. Problematical species in the genus Thagria are reviewed. Distribution of 235 known species and the relationship between clypellus configuration and geographical origin are given.