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 convexus Sharp, 1882 ( Figs 13A–E ; 18H ; 19E ; 22A ) Cybister convexus Sharp, 1882: 718 (orig. descr.); RḖGIMBART (1899): 353 ( Yunnan ); FENG (1932) : 35 ( Yunnan ); VAZIRANI (1969) : 284 ( Yunnan ); ZENG (1989) : 93 ( Yunnan ). Material examined. CHINA : YUNNAN : 1J, Tia Feng on (Grassy hill 3ml. N Yunnanfu). 25.viii.1934 , C. Brownell leg. ( SYSU ); 1 ♀ , Honghe Hani- Yi Autonomous Prefecture, Lvchun County, Niukong Township Section, terrace, 22.9873N , 102.2675E , 1336 m , 30.iv.2021 ,Z.Y.Jiang, Z.M.Yang, B. P.Huang & Z. Q. Mai leg. ( SYSU ); 1 ♀ , Dehong Dai Aut. Pref. mount. Range 31 km E Luxi, 2280 m , 24°29′31″N 98°52′58″E , 3.vi.2007 , D.W. Wrase leg. ( LHCM ); 1 J, Yunnan, Baoshan Pref. mount. Range, 22 km S Tengchong, 1750m , 24°49′29″N 98°29′27″E (in fishpond), 30.viii.2009 , D. W. Wrase leg. ( LHCM ). Diagnosis. TL 24–30 mm , elongate, oblong-oval ( Fig. 13A ). Head, pronotum and elytra dark green to black, apex of elytra with reddish-brown spots. Ventral surface black; abdominal ventrites III–IV with a yellow spot on each side ( Fig. 13B ). Head and pronotum smooth, elytra densely covered with conspicuous small granules. 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. Legs black; protarsomeres 1–3 of male broadly expanded into a palette, with four rows of adhesive setae on their ventral side; male with a single metatarsal claw; female with two metatarsal claws, posterior claw small and sinuate. Median lobe of aedeagus ʻCʼ- shaped in lateral view, slightly curved, broadest at middle, strongly narrowing in apical fifth, apex rounded ( Fig. 13C ); broad medially in ventral view, apical fifth slender like a tubular spine, apex truncated ( Fig. 13D ). Parameres moderately broad, strap-like apically ( Fig. 13E ). Habitat. The habitat information is not well known for this species. It can be found from hilly to high mountain regions ( ATTHAKOR et al. 2018 ). In Yunnan , it was collected in a water-filled rut on a forest track from Dehong ( HENDRICH 2008 ) and in a fish pond. In Lvchun County it was collected at night from terraced fields ( Fig. 18H ). Distribution. China ( Yunnan ) ( Fig. 22A ), India , Thailand (RḖGIMBART 1899; ZIMMERMANN 1920 ; FENG 1932 , 1933b ; GSCHWENDTNER 1938 ; VAZIRANI 1969 ; ZENG 1989 ; GHOSH & NILSSON 2012 ; ATTHAKOR et al. 2018 ).