Contribution to the knowledge of Clavigeritae (Coleoptera: Staphylinidae: Pselaphinae) from Fiji and Vanuatu, with the catalogue of Clavigeritae of Oceania Author Besuchet, Claude Muséum d’histoire naturelle, Route de Malagnou, CH- 1211 Genève 6, Switzerland Author Hlaváč, Peter Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Kamýcká 1176, CZ- 165 21 Praha 6, Czech Republic; e-mail: phlavac @ stonline. sk text Acta Entomologica Musei Nationalis Pragae 2011 2011-12-09 51 2 517 528 journal article 4622 10.5281/zenodo.5328923 82c0e92c-2ca4-474f-a228-259ad1adb559 0374-1036 5328923 Microconilon acuticollis sp. nov. ( Figs. 2 , 6 ) Type material (4 JJ 2 ♀♀ ). HOLOTYPE : J, FIJI : TAVEUNI: L. Tagimaucia track, 15 Jul 1987 , 700 m, G. Monteith & D. Cook. With Ants In Squamellaria sp. Ant Plant ( MHNG ). PARATYPES : 3 JJ 2 ♀♀ , the same data as holotype ( QMBA , MHNG , PHKS ). Description. Body ( Fig. 2 ) 2.30–2.45 mm long. Head rectangular, about 1.5 times as long as wide. Temples with well-defined carinae going from eyes to occipital margin of head.Antennae with terminal antennomere very long, 1.08–1.16 mm , with longer pubescence, flat through whole length but especially at apex, apex with 3–5 very long macrosetae. Pronotum about 1.65 times shorter than head and 1.6 times as wide as long. Elytra at suture less than half the maximum width of elytra, anterior border of shoulders with profound concavity. Abdomen with the composite tergite (IV–VI) 3.5 times as long as tergites VII–VIII combined. Mesotibiae with minuscule, but sharp and well-defined preapical spine. Aedeagus as in Fig. 6 , 0.48 mm long. Sexual dimorphism. Mesotibiae of female lacking preapical spines, apex rounded. Differential diagnosis. Similar to M. kuscheli sp. nov. , but smaller, with head less evenly flattened ventrally, pronotum more transverse, antennomere III much longer and pronotum larger. Biology. Unknown ant whose nest was in an ant plant of the genus Squamellaria . Etymology. The species name refers to the anteriorly narrowed neck of the species. Distribution. Fiji , Taveuni Island.