Two new species of cavernicolous trechines from central Guizhou and northwestern Guangxi, China (Coleoptera: Carabidae: Trechinae) Author Ma, Zijun 0000-0001-8884-3376 Department of Entomology, College of Plant Protection, South China Agricultural University, 483 Wushan Road, Guangzhou, 510642, CHINA & 3275124967 @ qq. com; https: // orcid. org / 0000 - 0001 - 8884 - 3376 3275124967@qq.com Author Huang, Sunbin 0000-0001-8357-6651 Department of Entomology, College of Plant Protection, South China Agricultural University, 483 Wushan Road, Guangzhou, 510642, CHINA & Mécanismes adaptatifs et évolution (MECADEV), UMR 7179 CNRS-MNHN, Muséum National d’Histoire Naturelle, CP 50, 57 rue Cuvier, 75005 Paris, France. huangsunbin @ 163. com; https: // orcid. org / 0000 - 0001 - 8357 - 6651 Author Tian, Mingyi Department of Entomology, College of Plant Protection, South China Agricultural University, 483 Wushan Road, Guangzhou, 510642, CHINA text Zootaxa 2020 2020-10-20 4861 4 581 593 journal article 9025 10.11646/zootaxa.4861.4.6 59dc47c8-01b5-4f14-baa6-95b57158ca96 1175-5326 4416789 1A9329DD-74BA-4B44-9008-383D4C88C9D1 Key to species of the banshanicus species group of the genus Sinaphaenops (modified from Chen, Huang & Tian, 2020 ) 1 Right mandible tridentate, protibia with a longitudinal sulcus (subgenus Sinaphaenops ( s . str .) Uéno & Wang)........... 2 - Right mandible bidentate, protibia without a longitudinal sulcus........................................................................... subgenera Thaumastaphaenops Magrini, Vanni & Zanon and Dongaphaenops Deuve & Tian 2 Body stouter, neck constriction comparatively wide.......................................................... 3 - Body slenderer, neck constriction distinctly narrow.................................... mirabilissimus species group 3 Pronotum with pair of lateral-marginal setae ( banshanicus species group)......................................... 4 - Pronotum without lateral-marginal setae................................................. trisetiger species group 4. Pronotum shorter ( Fig. 2A ), male genitalia with a distinct sagittal aileron ( Fig. 4 )........ S . ( s . str .) chengguangyuani n. sp. - Pronotum longer ( Fig. 2B, C ), male genitalia without sagittal aileron............................................ 5 5 Hind angles acute......................................................... S . ( s . str .) lipoi Chen, Huang & Tian - Hind angles obtuse................................................... S . ( s . str .) banshanicus Tian, Chen & Tang