Review of the genus Cybister in China, with description of a new species from Guangdong (Coleoptera: Dytiscidae) Author Jiang, Zhuo-Yin Institute of Entomology, Life Science School, Sun Yat-sen University, Guangzhou 510275, China; e-mail: zhuoyin _ jiang @ 126. com; ORCID ID https: // orcid. org / 0000 - 0001 - 6825 - 4283 Author Zhao, Shuang Guangzhou Customs Technology Center, Tianhe District, Guangzhou, China; e-mail: topzs @ 163. com; Author Mai, Zu-Qi School of Agriculture, Sun Yat-sen University, Guangzhou, 511436, China; e-mail: maizq Author Jia, Feng-Long Institute of Entomology, Life Science School, Sun Yat-sen University, Guangzhou 510275, China; & corresponding author Author Hendrich, Lars @ mail & corresponding author text Acta Entomologica Musei Nationalis Pragae 2023 2023-03-12 63 1 75 102 http://dx.doi.org/10.37520/aemnp.2023.003 journal article 10.37520/aemnp.2023.003 1804-6487 7887332 937DF12A-BC2F-4406-802F-63838312B0C1 Cybister ventralis Sharp, 1882 ( Figs 11A–E ; 22A ) Cybister ventralis Sharp, 1882: 742 (orig. descr.); KANO (1931) : 177 ( Taiwan) ; FENG (1933a) : 329 ( Sichuan , Shandong : Qingdao). Material examined. None from China. INDIA : 1 J 2 ♀♀ , Behar, India or., Coll.A. Zimmermann ( ZSMG ). SRI LANKA : 1♀ , Negombo, 1899, W. Horn, Coll. A. Zimmermann ( ZSMG ). Diagnosis. TL 28–32 mm , broad, oblong-oval ( Fig. 11A ). Head dark green, clypeus yellow. Pronotum dark green to black with lateral yellow margins projecting a little inwards along anterior margin behind eyes; elytra dark green to black, with distinct yellow margin laterally, apex of yellow margin on elytra hooked. Ventral surface yellow with central part of metaventrite and metacoxae black; abdominal ventrites III–V yellowish with a dark brown band anteriorly ( Fig. 11B ). Dorsal surface dimorphic in females: smooth or with isolated short, irregular striae on pronotum and dense longitudinal striae of three-fourths of elytral length from base. Prosternal process lanceolate, with distinct lateral bead, surface flat, apex pointed; lateral parts of metaventrite tongue-shaped, slender, not reaching lateral margins; metacoxal lines distinct, well impressed, nearly parallel medially, divergent anteriorly, along metacoxal lines with a row of punctures. Forelegs and midlegs yellow, tarsi darker; metafemur and metatibia yellow with broad dark brown marking; female with a single metatarsal claw. Median lobe of aedeagus ʻCʼ- shaped in lateral view, moderately curved ( Fig. 11C ); slightly narrow near apex in ventral view, apex furcate, with a notch medially, lateral margins of apex concave ( Fig. 11D ). Parameres more elongate, strap-like apically ( Fig. 11E ). Fig. 11. Cybister ventralis Sharp, 1882 (J♀, Pusa, Bihar, India). A – habitus in dorsal view; B – habitus in ventral view; C – median lobe of aedeagus in lateral view; D – median lobe of aedeagus in ventral view; E – paramere. Scale bars: 5.0 mm (A, B), 1.0 mm (C–E). Distribution. China ( Macao , Sichuan, Shandong, Taiwan) ( Fig. 22A ), Bangladesh , India , Myanmar , Pakistan , Sri Lanka (RḖGIMBART 1899, ZIMMERMANN 1920 , KANO 1931 , FENG 1933a , VAZIRANI 1969 , NILSSON 1995 , GHOSH & NILSSON 2012 , NILSSON & HÁJEK 2022b ).