Review of the Chinese species of Deleaster Erichson, 1839 (Coleoptera, Staphylinidae, Oxytelinae) with a mitogenome of Deleaster bactrianus Semenov, 1900 Author Wang, Lin-Fei Key Laboratory of Animal Diversity of Hebei Province, Langfang Normal University Aiminxidao 100, Anci District, Langfang, Hebei 065000, China Author Lü, Liang Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, No. 20 Road East. 2 nd Ring South, Yuhua District, Shijiazhuang, Hebei 050024, China text Zootaxa 2021 2021-09-01 5027 3 301 331 journal article 10.11646/zootaxa.5027.3.1 1175-5326 5449664 6E989A48-DA0C-4EFF-BD4A-26AD45A5FFDF Deleaster taiwanensis Hayashi, 1984 [台,寻ƫ隐翅*] ( Fig. 3 ) Hayashi, 1984: 91 ( Type locality: Mt. Lishan, alt. about 2500 m , Nantou Hsien [ 南投a ], Taiwan) ; Herman, 2001: 1326 (catalogue; distribution); Löbl & Smetana, 2004: 512 (Palaearctic catalogue; distribution); Schülke & Smetana, 2015: 768 ( Deleaster ; Taiwan) . Material examined. CHINA , Taiwan : 1♂ , 1♀ , Shenmu [ ›木 ] (near Fenchiifu [ 奋起湖 ]), Chiai Hsien [ ƚ义a ], 16. VII. 1986 , Deleaster taiwanensis Hayashi , “ Cum typo comp.” det. Y. Hayashi , 2013 (IZ-CAS, donated by Y. Hayashi ). Redescription. Body ( Fig. 3A ) thickset, flat, and broad, with sparse golden pubescent; almost dark brown to black in dorsal view. Clypeus, mouthparts, antennae, and legs yellowish brown with reddish. Body length: ♂ , 8.0 mm; ♀ , 9.1 mm . FIGURE 3 Deleaster taiwanensis Hayashi : A, habitus ♂; B, head ♂; C, pronotum ♂; D, tergite VIII ♂; E, tergite VIII ♀; F, sternite VIII ♂; G, sternite VIII ♀; H, abdominal segment IX–X ♂ (ventral view); I, abdominal segment IX–X ♀ (ventral view); J, aedeagus (ventral view); K, aedeagus (dorsal view); L, aedeagus (lateroventral view); M, aedeagus (lateral view). Scales: A = 3 mm; B, C = 1 mm; rest, 0.3 mm. Male : Head ( Fig. 3B ) transverse, slightly broader than pronotum, sparsely pubescent and punctate. Clypeus rectangular, with sparse setae, anterior margin broadly rounded. Epistomal suture straight, deeply sulciform, equal to level of anterior margin of supra-antennal ridge. Front with sparse microsculpture. Vertex slightly convex and laterally delimited by U-shaped impression. Occipital suture weakly curved to straight with pit in middle. Temples considerably shorter than eyes. Antennae with antennomeres 3 as long as 1, and both longer than others. Pronotum ( Fig. 3C ) roughly as long as wide, broadest at near anterior 1/4 and narrowed posteriorly; middle portion of pronotum smoothly elevated and sparsely punctate and microsculptured, surrounded with shallow, broad impression covered with coarse microsculpture; with pair of large punctures present towards anterior margin, and two distinct elevated tubercles near posterior angles; mid-longitudinal suture thin and feeble. Scutellum pubescent on coarse surface, with scutiform depression. Elytra ( Fig. 3A ) large and wide, covered by short pale pubescence. Legs ( Fig. 3A ) slender, tarsal formula 5-5-5, tarsomeres 1–4 expanded (especially in protarsus) and densely padded with fine hairs. Fifth tarsomere as long as remaining together. Abdomen coriaceous without puncture. Tergites II–VII without basolateral ridges, with a pair of laterosternites on each segment. Tergite VIII with apical margin straight and pectinate in middle ( Fig. 3D ). Sternite VIII with posterior margin broadly emarginated ( Fig. 3F ). Sternite IX divided ( Fig. 3H ). Aedeagus ( Fig. 3J–M ) with median lobe oblong in ventral view, parameres clavate, with apex slightly curved but not plump. Female : similar to male, but slightly larger in size; protarsi not so dilated as male; sternite VIII with posterior margin obtusely angled in middle ( Fig. 3G ); Sternite IX undivided ( Fig. 3I ). Distribution: China ( Taiwan) .