The genus Platydracus Thomson in Hainan, South China (Coleoptera, Staphylinidae, Staphylininae) Author Huang, Jia-Yi https://orcid.org/0009-0005-4612-5313 College of Life Sciences, Shanghai Normal University, 100 Guilin Road, 1 st Educational Building 323 Room, Shanghai, 200234, China Author Chen, Jia-Wei https://orcid.org/0009-0001-4757-9406 Diaoluoshan Branch, Hainan Tropical Rainforest National Park Administration, Lingshui County, Hainan, 572400, China Author Tang, Liang 0000-0002-6731-4544 College of Life Sciences, Shanghai Normal University, 100 Guilin Road, 1 st Educational Building 323 Room, Shanghai, 200234, China text ZooKeys 2024 2024-09-16 1212 129 141 journal article 10.3897/zookeys.1212.128295 DF37117E-FC2E-4CE1-8790-6984780771CA Platydracus juang Smetana, 2005 Figs 2 , 9–12 Platydracus juang Smetana, 2005: 22 ; Xu and Tang 2019: 185 ; Hu 2020: 346 ; Zhou Zhao and Tang 2024: 508. Material examined. China Hainan Prov. 1 ♂ ; Jianfengling N. R . , decaying log; 15 Nov. 2009 ; Wen Dong leg.; SHNU 1 ♀ ; Diaoluoshan N. R . ; alt. 1000 m ; Dec. 2022 ; Zhou & Cai leg.; SHNU 1 ♀ ; Ledong County , Jianfengling N. R . , Mingfenggu , rainforest, decaying log; 18 ° 44 ' 30 ″ N , 108 ° 50 ' 29 ″ E ; alt. 995 m ; 26 Jan. 2015 ; Peng , Yin , Tu , Song , Shen , Zhou & Wang leg.; SHNU 1 ♀ ; Lingshui County ; Diaoluo Shan N. R . ; alt. 900 m ; 22 May 2014 ; Qiu-Jian Yue leg.; SHNU . Measurements. Male : BL : 13.4–19.3 mm , FL : 6.89–10.55 mm . HL : 1.60–2.65 mm , HW : 1.91–2.84 mm , EYL : 0.62–0.80 mm , TL : 0.74–1.23 mm , PL : 2.28–3.39 mm , PW : 2.10–3.15 mm , EL : 2.71–4.07 mm , EW : 2.59–3.95 mm . HW / HL : 1.07–1.19, TL / EYL : 1.20–1.54, PL / PW : 1.08–1.15, EL / EW : 1.03–1.07. Female : BL : 12.3–20.0 mm, FL : 7.00– 9.67 mm . HL : 1.60–2.16 mm , HW : 1.97–2.59 mm , EYL : 0.56–0.74 mm , TL : 0.74–1.05 mm , PL : 2.34–3.15 mm , PW : 2.10–2.78 mm , EL : 2.71–3.70 mm , EW : 2.53–3.58 mm . HW / HL : 1.17–1.23, TL / EYL : 1.33–1.42, PL / PW : 1.11–1.13, EL / EW : 1.03–1.07. Diagnosis. The species is similar to P. brachycerus Smetana & Davies, 2000 , in most aspects, but it can be distinguished from the latter by the more rounded temples, longer pronotum, and sparser punctation of the head. Distribution. China ( Anhui , Fujian , Guangdong , Guangxi , Hainan , Hunan , Jiangxi , Taiwan , Zhejiang).