Revision of the bark louse genus Ceratostigma Li, 2002 (Psocodea: Psocidae: Psocinae) with description of a new species from China Author Jie, Lulan 0000-0003-1976-4126 Department of Entomology, China Agricultural University, Beijing 100193, China & jielulan @ 163. com; https: // orcid. org / 0000 - 0003 - 1976 - 4126 Author Liang, Feiyang 0000-0001-9757-5457 Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, School of Life Science, Hunan University of Science and Technology, Xiangtan 411201, China. feiyang _ sco @ foxmail. com; https: // orcid. org / 0000 - 0001 - 9757 - 5457 Correspondence author. xingyue _ liu @ yahoo. com; https: // orcid. org / 0000 - 0002 - 9168 - 0659 feiyang_sco@foxmail.com Author Liu, Xingyue Department of Entomology, China Agricultural University, Beijing 100193, China text Zootaxa 2022 2022-07-21 5168 2 196 206 journal article 102840 10.11646/zootaxa.5168.2.6 2321acd5-bfae-409d-ac2b-8e86cad9ec6e 1175-5326 6877303 2C8FA1A7-53AD-4611-B88E-C09A62845C83 Ceratostigma gracilis Li, 2002 ( Figs 1–15 ) Ceratostigma gracilis Li, 2002: 1595 . Type locality: China ( Guangxi , Longsheng , Tianpingshan ). Diagnosis. Male. Forewing ( Fig. 1 ) basal one-fifth with a slightly curved greyish white stripe; radial fork with branches diverging at an angle about 90°. Epiproct ( Figs 3–4 ) nearly triangular, pointed at apex, with a nearly Ushaped sclerotized area at base; hypandrium ( Figs 5–6 ) with a broad ridge at middle. Female. Forewing ( Fig. 8 ) with a grayish white striped marking at one-fifth base; radial fork with branches diverging at an angle about 90°. Pigmented area of subgenital plate ( Figs 14–15 ) roughly T-shaped, distally flat; dorsal valve ( Figs 12–13 ) anterior one-third with a slightly sclerotized area. Distribution. China ( Guangxi ). Material examined. Holotype male, CHINA : Guangxi , Longsheng , Tianpingshan [ 25°39’N , 109°55’E ], 680 m , 12.VII.1982 , Fasheng Li ( CAU ) ; Paratype : 1 female , same as holotype ; 1 male , 1 female , CHINA : Guangxi , Jiuxiu , Dayao Mountain [ 23°58’N , 110°07’E ], 720 m , 23. VI .1982, Fasheng Li ( CAU ) . Remarks. Ceratostigma gracilis is similar to C. macrostigmatum in male forewing basal one-fifth with a slightly curved greyish white stripe; radial fork with branches diverging at an angle less than 90°; epiproct nearly triangular, pointed at apex, with a nearly U-shaped sclerotized area at base; hypandrium with a broad ridge in the medium. C. gracilis can be distinguished from C. macrostigmatum by the hypandrium rounded apically, while the hypandrium of C. macrostigmatum is narrowed distally.