A review of the genus Linan (Coleoptera: Staphylinidae: Pselaphinae) Author Yin, Zi-Wei Department of Biology, College of Life and Environment Sciences, Shanghai Normal University, 100 Guilin Road, Shanghai, 200234, P. R. China; e-mails: yin _ ziwei @ yahoo. com; lizhenli @ shnu. edu. cn Author Li, Li-Zhen Department of Biology, College of Life and Environment Sciences, Shanghai Normal University, 100 Guilin Road, Shanghai, 200234, P. R. China; e-mails: yin _ ziwei @ yahoo. com; lizhenli @ shnu. edu. cn Author Zhao, Mei-Jun Department of Biology, College of Life and Environment Sciences, Shanghai Normal University, 100 Guilin Road, Shanghai, 200234, P. R. China; e-mails: yin _ ziwei @ yahoo. com; lizhenli @ shnu. edu. cn & Corresponding author; e-mail: mjzhao @ shnu. edu. cn text Acta Entomologica Musei Nationalis Pragae 2011 2011-06-30 51 1 123 135 journal article 10.5281/zenodo.5327198 0374-1036 5327198 Genus Linan Hlaváč, 2002 ( Figs. 1–48 ) Linan Hlaváč, 2002: 294 . HLAVÁČ & CHANDLER 2005: 110 . Type species. Lasinus chinensis Löbl, 1964 , by original designation. Diagnosis. The genus Linan could be readily separated from allied genera within the Pselaphodes complex by the following combination of characters: Head with vertexal and frontal foveae indistinct; maxillary palpi with segments III–IV asymmetrical, roundly expanded or with external protuberance; pronotum with small but well-defined median and lateral antebasal foveae; head, pronotum and legs densely and roughly punctate; median metaventral fovea present; metaventral horn-like processes present in male; elytra simple without carinae. Redescription. Length 2.35–3.63 mm . Head, antennae, pronotum, abdomen and legs reddishbrown, elytra lighter, maxillary palpi and tarsi yellowish-brown. Head nearly triangular, roughly punctate, sparsely covered with pubescence; frontal fovea and pair of vertexal foveae very indistinct; antennae elongate, pubescent; scape roughly punctate, about as long as segments II–V combined; antennal club three-segmented; antennomeres IX–X strongly modified or not in male, not modified and weekly clubbed in female. Pronotum about as long as wide, roughly punctate, pubescent. Width of the elytra wider than long, pubescent; each elytron with two basal foveae; discal stria reaching apical twothirds of elytral length. Legs elongate and slender with femora roughly punctate, usually simple without spine (except for L . cardialis ); protibiae in some species expanded mesally at apex as a spur or lobe in male; tarsi three-segmented. Venter with metaventrite depressed, smooth; median metaventral horn-like processes paired and well-defined in male, various in length and shape; median metaventral foveae present. Figs. 1–4. Male habitus of Linan spp. 1 – L . cardialis Hlaváč, 2002 ; 2 – L . chinensis ( Löbl, 1964 ) ; 3 – L . hainanicus Hlaváč, 2002 ; 4 – L . inornatus sp. nov. Figs. 5–6. Dorsal habitus of Linan spp. 5 – L . megalobus sp. nov. , male; 6 – L . sp. indet., female. Abdomen with first visible tergite (morphological tergite IV) largest, discal ridges present or absent; following segments successively shorter and narrower; paratergites well-defined. Aedeagus with median lobe large; parameres paired; endophallus provided with various types of sclerites. Discussion. Species of the genus Linan can be classified into two groups (here proposed): the L . cardialis species-group, with strongly modified antennal segments IX–X and modified protibiae at apex in male, including L . cardialis , L . hainanicus , and L . megalobus sp. nov. , and the L. chinensis species-group, lacking obvious sexual modifications of the male antennal club and protibiae, containing L . chinensis and L . inornatus sp. nov.