Five new species of Nazeris Fauvel in Guangxi, China (Coleoptera, Staphylinidae, Paederinae) Author Hu, Jia-Yao Author Qiao, Yu-Jia text Zootaxa 2019 2019-01-08 4543 3 431 441 journal article 27696 10.11646/zootaxa.4543.3.8 a6fad20b-7037-4fec-abad-93014894e0db 1175-5326 2617913 5D85B2BA-EF35-4C83-A373-D07F382D6760 Nazeris biacuminatus Hu & Qiao , sp. n. (Figs 5, 30–34) Type material. Holotype : CHINA : male, ‘ China : Guangxi Prov., Xing'an County , Mao'ershan N. R. , 450–650 m , 25.VII.2012 , Hu & Song leg.’ (SNUC). Paratypes : 1 female , same data as holotype . Description. Body length 6.2–7.3 mm ; forebody length 3.6–3.7 mm . Body (Fig. 5) dark brown; antennae and legs yellowish brown. Head ( Fig. 30 ) 1.03–1.05 times as long as wide; punctation very dense, moderately coarse, distinctly umbilicate and not confluent, interstices lacking microsculpture; postocular portion approximately 1.7 times as long as eye length. Pronotum ( Fig. 30 ) 1.17–1.20 times as long as wide, approximately as long and 0.87–0.88 times as broad as head; punctation non-umbilicate, moderately dense and as coarse as that of head; midline posteriorly with very short and narrow impunctate elevation; interstices lacking microsculpture. FIGURES 30–34 . Nazeris biacuminatus 30. forebody; 31. male sternite VII; 32. male sternite VIII; 33. aedeagus, in ventral view; 34. aedeagus, in lateral view. Scale bars: 30: 1 mm, 31–34: 0.5 mm Elytra ( Fig. 30 ) 0.63–0.66 times as long as wide, 0.53–0.54 times as long and as broad as pronotum; punctation as dense and coarse as that of pronotum; interstices lacking microsculpture. Abdomen with punctation dense and rather coarse on tergites III–IV, dense and less coarse on tergite V–VI, moderately dense and fine on tergites VII–VIII; interstices lacking microsculpture. Male . Sternite VII ( Fig. 31 ) with posterior margin nearly truncate in the middle. Sternite VIII ( Fig. 32 ) with triangular posterior excision. Aedeagus ( Figs 33, 34 ) weakly sclerotized; ventral process long, with pair of small laminae in basal third, apex divided into two straight branches in ventral view; dorso-lateral apophyses very slender and nearly straight, not reaching apex of ventral process. Distribution and habitat data. The species is known only from Mao'ershan in northeast Guangxi . The specimen was collected by sifting leaf litter at altitudes of 450– 650 m . Comparative notes. This species is most similar to N. exilis Hu & Li (Hu & Li 2017 : 338, Figs 20–24 ) in general appearance and aedeagal characters, but can be separated by the truncate posterior margin of male sternite VII ( Fig. 31 ), by the wider apical branches of ventral process of the aedeagus ( Fig. 33 ), and by the straight and more slender dorso-lateral apophyses of aedeagus ( Fig. 34 ). Etymology. The specific epithet (Latin, adjective: acuminate ) alludes to the apically divided ventral process of aedeagus in ventral view.