Five new species of the genera Labomimus and Linan from Guangxi, South China (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-mail: yin _ ziwei @ yahoo. com 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-mail: yin _ ziwei @ yahoo. com & corresponding author: e-mail: lizhenli @ shnu. edu. cn text Acta Entomologica Musei Nationalis Pragae 2013 2013-07-15 53 1 141 153 journal article 10.5281/zenodo.5740186 0374-1036 5740186 Labomimus quadratithorax sp. nov. ( Figs 1B , 3 , 8B ) Type locality. China , Guangxi Province , Lingui County, Huaping Natural Reserve, An-Jiang-Ping, 1400–1700 m a.s.l., 25°35′46″N , 109°55′41″E . Type material. HOLOTYPE : J, labeled ‘ CHINA : Guangxi Prov. / Lingui County / Huaping , Anjiangping / 14.vii.2011 , 1400–1700 m / Zhong Peng leg. // HOLOTYPE (red) / Labomimus quadratithorax / sp. n., Yin & Li / det. 2012, SNUC’. Diagnosis. Reddish brown; medium-sized; postgenae strongly narrowed posteriorly; antennomeres IX–XI elongate and enlarged; pronotum nearly quadrate; with long metaventral processes; metatrochanter spinose; aedeagus with asymmetric median lobe. Description. Male ( Fig. 1B ). Length 2.73. Head as long as wide, HL 0.68, HW 0.67; eyes each composed of about 20 facets. Antennal club as in Fig. 3A . Pronotum ( Fig. 3B ) as long as wide, PL 0.61, PW 0.61, with lateral margins slightly rounded laterally. Elytra wider than long, EL 0.68, EW 1.06. Metaventral processes long, broadened apically ( Fig. 3C ). Protrochanters, profemora ( Fig. 3D ), mesotrochanters and mesofemora ( Fig. 3E ) simple, metatrochanters ( Fig. 3F ) with short blunt ventral spine. Abdomen large, AL 0.76, AW 1.07. Sternite IX as in Fig. 3G . Aedeagus length 0.50; median lobe asymmetric at apex ( Figs. 3H–J ). Fig. 2. Diagnostic features of male Labomimus maoershanus sp. nov. A – antennal club; B – pronotum; C – metaventral process, lateral view; D – protrochanter and profemur; E – mesotrochanter and mesofemur; F – metatrochanter and metafemur; G – sternite IX; H – aedeagus, dorsal view; I – same, lateral view; J – same, ventral view. Scales: A, B, D, E, F = 0.3 mm; C, H, I, J = 0.2 mm; G = 0.1 mm. Female. Unknown. Fig. 3. Diagnostic features of male Labomimus quadratithorax sp. nov. A – antennal club; B – pronotum; C – metaventral process, lateral view; D – protrochanter and profemur; E – mesotrochanter and mesofemur; F – metatrochanter and metafemur; G – sternite IX; H – aedeagus, dorsal view; I – same, lateral view; J – same, ventral view. Scales: A, B, D, E, F = 0.3 mm; H, I, J = 0.2 mm; C, G = 0.1 mm. Comparative notes. This species can be separated from all other congeners by the uniquely constricted postgenae and the quadrate pronotum. Etymology. The new species is named from a combination of the Latin stem, ‘ quadrati ’ and Greek word ‘ thorax ’, referring to the unique pronotal shape of the new species. Noun in apposition. Biology. The single specimen was collected by sifting leaf litter along a road to the peak in a broad-leaved forest ( Fig. 8B ). Distribution. South China : Guangxi .