Twenty-one new species of Omaliini from the Papuan Region (Coleoptera: Staphylinidae: Omaliinae), with diagnostic and faunistic notes on some species of the genus Paraphloeostiba Steel, 1960 Author Shavrin, Alexey V. text Zootaxa 2024 2024-03-14 5424 3 251 307 http://dx.doi.org/10.11646/zootaxa.5424.3.1 journal article 10.11646/zootaxa.5424.3.1 1175-5326 10821214 DE26201A-252D-40D3-A5CF-FCCC6B3C2D01 Key to species of the genus Nipponophloeostiba (modified from Shavrin 2020) 1 Postocular portions of head distinctly widened lateroposteriad, with short posterior carina not reaching posterior margin of eye. Aedeagus as in Figs. 86–87 in Watanabe (1990) . Head and pronotum reddish-brown, elytra and abdomen yellow-brown. Body length: 2.30–2.70 mm . South Japan .............................................. N. verrucifera Watanabe, 1962 - Postocular portions of head not or indistinctly widened lateroposteriad, with longer posterior carina reaching posterior margin of eye or basal margin of ptonotum. Coloration different...................................................... 2 2 Head as broad as pronotum. Elytra moderately long, significantly longer than pronotum. Median lobe and parameres narrow as in Fig. 2 in Shavrin (2020). Head and abdomen brown, pronotum reddish-brown. Body length: 1.75–2.22 mm . Malaysia .................................................................................... N. thayeri Shavrin, 2020 - Head slightly narrower or broader than pronotum. Elytra shorter, slightly broader than pronotum. Median lobes and parameres different. Coloration different........................................................................... 3 3 Head slightly narrower than pronotum.Aedeagus as in Fig. 39 in Shavrin (2020). Head, pronotum and abdomen reddish-brown, elytra yellow-brown, with darker parascutellar portion. Body length: 2.07 mm . Laos , Indonesia ( Sulawesi )............................................................................................ N. longilobata Shavrin, 2020 - Head slightly broader than pronotum. Aedeagus and coloration different. Body larger............................... 4 4 Temples slightly shorter than longitudinal length of eyes. Elytra as broad as long. Body reddish-brown. Median lobe narrow; parameres strongly broadened in apical portions as in Fig. 3 in Shavrin (2023a) . Habitus as in Fig. 1 in Shavrin (2023a) . Body length: 2.33 mm . Indonesia ( Bali )................................................... N . explanata Shavrin, 2023 - Temples three times shorter than longitudinal length of eyes. Elytra slightly longer than broad. Head, pronotum and abdomen reddish-brown; elytra yellow-brown, with reddish apical portion. Median lobe wide; parameres slightly broadened in apical portions ( Fig. 7 ). Habitus as in Fig. 1 . Body length: 2.34 mm . Papua New Guinea ................. N . hornabrooki sp. n.