Sathytes chayuensis sp. nov. urn:lsid:zoobank.org:act: B95327A9-4E88-4DA8-818F-319126D7340A Fig. 3 Differential diagnosis The male of S. chayuensis sp. nov. can be separated from that of all congeners by a single basal protuberance on the terminal antennomere and by the remarkably elongate antennomere 11. Etymology The new species is named after Chayu County, where the type locality of this species is situated. Type material (4 specimens) Holotype CHINA • ♂; Xizang, Chayu Co. (ṘḎn), Xiachayu To. (TṘḎđ), Talin Bridge (ŖWv); 28.53340539° N, 96.97800188° E; alt. 1541 m; 30 Jul. 2019; Liang Lü leg.; SNUC. Paratypes CHINA • 2 ♂♂, 1 ♀; same collection data as for holotype; SNUC. Description Male MEASUREMENTS. AeL = 0.33 mm; AnL = 1.53–1.56 mm; AL = 0.76–0.79 mm; AW = 0.97–1.01 mm; TBL = 2.80–2.99 mm; EL = 0.93–0.96 mm; EW = 1.10–1.15 mm; HL = 0.58–0.61 mm; HW = 0.55– 0.57 mm; LE = 0.21 mm; LT = 0.21 mm; PL = 0.66–0.70 mm; PW = 0.64–0.68 mm. Body (Fig. 3A) reddish-brown, mouthparts and tarsi paler. Head wider than long. Each eye composed of about 25 facets; LE:LT = 1. Antennal clubs (Fig. 3B) formed by antennomeres 9–11; antennomere 9 (Fig. 3C) slightly transverse, inner margin angularly expanded mesally, each with single semimembranous apophysis anterior to apex of expansion; antennomere 10 strongly transverse, obconical; antennomere 11 (Fig. 3B) about 2.1 times as long as wide, each with single apically concave basal protuberance covered with tuft of elongate setae at apex (Fig. 3D). Pronotum about as long as wide. Elytra strongly transverse. Abdomen widest at tergite 1 (IV) and narrowing apically. Aedeagus (Fig. 3E) flattened and slightly asymmetrical. Female MEASUREMENTS. AnL = 1.42 mm; AL = 0.91 mm; AW = 1.07 mm; TBL = 3.05 mm; EL = 0.98 mm; EW = 1.16 mm; HL = 0.67 mm; HW = 0.63 mm; LE = 0.19 mm; LT = 0.21 mm; PL = 0.71 mm; PW = 0.71 mm. Slightly larger than male in size. Each eye composed of about 15 facets; LE: LT = 0.9. Antennal clubs lacking modifications. Distribution China: Xizang.

Published as part of Yin, Zi-Wei & Shen, Qi, 2020, Fifteen new species of Sathytes Westwood from China (Coleoptera, Staphylinidae, Pselaphinae), with an updated checklist of world species, pp. 37-74 in European Journal of Taxonomy 722 on pages 42-44, DOI: 10.5852/ejt.2020.722.1133, http://zenodo.org/record/4134339