A monograph on the genus Tetraserica from the Indochinese region (Coleoptera, Scarabaeidae, Sericini) Author Fabrizi, Silvia Author Dalstein, Vivian Author Ahrens, Dirk text ZooKeys 2019 837 1 155 http://dx.doi.org/10.3897/zookeys.837.32057 journal article http://dx.doi.org/10.3897/zookeys.837.32057 1313-2970-837-1 4A18822935804DB7B1229F131F6A0AC8 4A18822935804DB7B1229F131F6A0AC8 Tetraserica khaosoidaoensis sp. n. Figures 32, 48 Type material examined. Holotype: ♂ "E Thailand, 5.-13.5. Chanthaburi Dist. Khao Soi Dao, 1998, J. Horak leg./ coll. P Pacholatko / 129 Sericini Asia spec." (CPPB). Paratype: 1 ♂ "E Thailand, 5.-13.5. Chanthaburi Dist. Khao Soi Dao, 1998, M Knizek lgt./ coll. P Pacholatko" (ZFMK). Description. Length of body: 7.4 mm; length of elytra: 5.6 mm; maximum width: 4.6 mm. Surface of labroclypeus and disc of frons glabrous. Smooth area anterior to eye twice as wide as long. Eyes small, ratio of diameter/interocular width: 0.54. Ratio of length of metepisternum/metacoxa: 1/1.68. Metatibia short and wide, ratio width/length: 1/3; basal group of dorsal spines of metatibia at first third of metatibial length. Aedeagus: Fig. 32 A-C . Habitus: Fig. 32D. Figure 32. A-D Tetraserica khaosoidaoensis sp. n. (holotype) E-H T. pahinngamensis sp. n. (holotype) I-L T. wapiensis (Frey, 1972) (paratype) A, E, I aedeagus, left side lateral view C, G, K aedeagus, right side lateral view B, F, J parameres, dorsal view D, H, L habitus. Scale bars: 0.5 mm. Habitus not to scale. Female unknown. Variation. Length of body: 7.4-7.8 mm; length of elytra: 5.5-5.6 mm; maximum width: 4.6-4.8 mm. Diagnosis. Tetraserica khaosoidaoensis sp. n. is very similar to T. nussi sp. n. in shape of the aedeagus; but differs by the distinctly shorter right paramere as well as the only slightly bent right paramere. Etymology. The new species is named after the type locality, Khao Soi Dao (adjective in the nominative singular).