Ngirhaphium Evenhuis & Grootaert from southern Thailand (Diptera: Dolichopodidae) with the description of a new species Author Samoh, Abdulloh Author Boonrotpong, Singtoe Author Grootaert, Patrick text Zootaxa 2015 3946 1 125 132 journal article 10.11646/zootaxa.3946.1.6 3c436d2a-03ca-4ea7-8090-2a1aca173f45 1175-5326 233509 013418D0-B239-4837-9D9C-39616349AEF3 Key to males of Ngirhaphium 1 Mesonotum and tergites metallic blue. Antenna with apical aristal article filiform and much longer than basal article (Singa- pore). Genitalia as in Figures 8 and 11 ..................................... N. caeruleum Grootaert & Puniamoorthy - Mesonotum and tergites mainly metallic green. Antenna with apical aristal article shorter or about half as long as apical article................................................................................................... 2 2 Cerci in lateral view nearly as long as dorsal surstyli ( Figs 3, 4 ).............................. N. chutamasae sp. nov. - Cerci in lateral view longer than dorsal surstyli ( Figs 7, 9 ).................................................... 3 3 Dorsal surstylus elongate, digitiform with truncate apex ( Figs 9, 12 ) slightly shorter than cercus. Cerci with narrow apex, set with 2 apical setae ( Fig. 12 ).................................................. N. murphyi Evenhuis & Grootaert - Dorsal surstylus with very wide apex ( Fig. 7 ) much shorter than cercus. Cerci with expanded apex set with many yellow setae ( Fig. 10 )............................................................ N. sivasothii Grootaert & Puniamoorthy