Descriptions of two new flightless species of Pseudocsikia Schimmel & Platia (Coleoptera, Elateridae, Dimini) from Taiwan Island, China, with a definition of the formosana species-group Author Qiu, Lu https://orcid.org/0000-0002-0946-1634 Engineering Research Center for Forest and Grassland Disaster Prevention and Reduction, Mianyang Normal University, Mianxing West Road, 621000, Mianyang, China 123church@163.com Author Kundrata, Robin https://orcid.org/0000-0001-9397-1030 Department of Zoology, Faculty of Science, Palacky University, 17. listopadu 50, 77146, Olomouc, Czech Republic text ZooKeys 2022 2022-06-01 1103 123 138 http://dx.doi.org/10.3897/zookeys.1103.84015 journal article http://dx.doi.org/10.3897/zookeys.1103.84015 1313-2970-1103-123 58199DE7FAD743E1A029DC969C6E9BFC A820088C785659F18D1C8E0F14FC642D Pseudocsikia formosana ( Ohira , 1972) Fig. 2A-J Csikia formosana Ohira , 1972: 8 (original description); Bouwer 1991 : 57 (checklist); Jiang 1993 : 146 (catalogue); Suzuki 1999 : 120 (catalogue). Pseudocsikia formosana ( Ohira , 1972): Schimmel 1993 : 255 (new combination); Schimmel 1996a : 204 (diagnosis); Cate et al. 2007 : 186 (catalogue); Kundrata et al. 2018 : 66 (catalogue). Type material. Holotype of Csikia formosana Ohira , 1972, male, "TAIWAN (C.): Bu-kai. 900 m. VI.15-34. Gressitt", " Csikia formosana Ohira , 1972 Det H Ohira 1972", "HOLOTYPE" , "No. 9486", "Examined. Det. W. Suzuki, 1982" (BPBM). One paratype of Csikia formosana Ohira , 1972, sex unknown, "TAIWAN (C.): Bu-kai. 900 m. VI-15-34. Gressitt", " Csikia formosana Ohira, 1972 Det H Ohira 1972", "PARATYPE" (BPBM). Diagnosis. (based on Ohira 1972 and the figures of holotype and one paratype provided by BPBM). Body length 4.0 mm, width 1.7 mm (based on holotype; see Ohira 1972 ). Body reddish brown (examined paratype darker than holotype; Fig. 2A-C, I ), outer margins of pronotum and elytra, underside, and legs paler. Antenna exceeding posterior angle of pronotum by about apical two antennomeres ( Ohira 1972 ). Antennomere II slightly shorter than antennomere III ( Ohira 1972 ). Punctures on pronotum of moderate size, intervals between punctures mostly equal 3-5 puncture diameters, anterior protrusion of pronotum with apex laterad of center (Fig. 2E, F ). Posterior angle (Fig. 2G ) of pronotum long, straight and robust, apex blunt, inner margin with obtuse protrusion subapically. Aedeagus with robust median lobe, twice as long as paramere; with large acute lateral processes near midlength, apex rectangular, with large subapical spines laterally (Fig. 2H ) (needle-like ventral sclerite not mentioned in Ohira 1972 and not observable in this study). Paramere stout, reaching half length of median lobe; apex rounded, slightly outwards. Phallobase subquadrate, margins thickened, medially with longitudinal thickened line, basal angles rounded (based on Ohira 1972 : fig. 3). Distribution. China: Taiwan (Nantou). Checklist of Pseudocsikia species from China, with notes on their type localities Pseudocsikia formosana ( Ohira , 1972) Chinese common name : 台湾伪斯叩甲 . Type locality : "Bukai" ( Ohira 1972 ). Note : Bukai is an old name of Fatyu [法治] (or Wuchieh [武界]) ( Chu and Yamanaka 1973 ), Ren'ai township [仁爱乡], Nantou County [南投县], Taiwan. Pseudocsikia gaoligongshana Schimmel, 1996 Chinese common name : 高黎贡伪斯叩甲 . Type locality : "Yunnan, Gaoligongshan, 100 km westlich von Baoshan [100 km W of Baoshan]" ( Schimmel 1996b ). Note : Gaoligongshan [高黎贡山] is an extensive mountain range lying on the border of Yunnan, China and Myanmar; the exact locality information of the holotype is unknown. However, according to the original paper, the holotype was collected 100 km west of Baoshan, which is near Tengchong. Pseudocsikia turnai Schimmel, 2006 Chinese common name : 图氏伪斯叩甲 . Type locality : "China: Hubei-Provinz, 30 km nordostlich von Hefeng, Mulinzi [30 km NE of Hefeng, Mulinzi]" ( Schimmel 2006 ). Note : Mulinzi [木林子] is a nature reserve in Hefeng County [鹤峰县], Enshi City [恩施市], Hubei. Pseudocsikia choui Qiu & Kundrata, sp. nov. Chinese common name : 周氏伪斯叩甲 . Type locality : Erwanping, Mount Alishan, Chiayi County, Taiwan, 2000 m (this work). Pseudocsikia chanjuan Qiu & Kundrata, sp. nov. Chinese common name : 婵娟伪斯叩甲 . Type locality : Mount Taimalishan, Taitung County, Taiwan, 1300 m (this work).