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 Li, 2002 Ceratostigma Li, 2002: 1595 . Type species: Ceratostigma gracilis Li, 2002: 1595 , by original designation. Diagnosis. Forewing with veins on basal two-thirds yellowish or grayish white; Sc usually ending free; Rs and M meeting in a point or fused for a short distance; CuA 1-2 and M+CuA 1 nearly in a line. Male genitalia: Hypandrium of asymmetrical, simple plate, medially with a ridge. Female genitalia: Epiproct subtriangular. Paraproct subtriangular. Subgenital plate with a short and distally rounded egg guide; pigmented area slightly sclerotized, roughly T-shaped, stem of T-shaped marking more than two times as long as basal width. Dorsal valve of gonapophyses broad, pointed at tip, inner margin with a strongly sclerotized area at base; external valve with a triangular posterior lobe. Distribution. China , Indonesia . Key to species of Ceratostigma 1 Male ............................................................................................... 2 - Female............................................................................................. 5 2 Radial fork with branches diverging at an angle less than 90°................................................... 3 - Radial fork with branches diverging at an angle more than 90° ( Fig. 23 ).................... Ceratostigma stagona sp. n. 3 Radial fork with branches diverging at an angle of about 60°; epiproct distally pointed.............................. 4 - Radial fork with branches diverging at an angle of about 30°; epiproct distally rounded (New et al. 2002: figs 124, 128).................................................................... Ceratostigma lisae ( Thornton, 1984 ) comb. n. 4 Hypandrium distally narrowed ( Figs 20–21 )........................ Ceratostigma macrostigmatum ( Li & Yang, 1987 ) - Hypandrium distally not narrowed ( Figs 5–6 )....................................... Ceratostigma gracilis Li, 2002 5 Cells r3 and r5 almost hyaline; radial fork with branches diverging at an angle less than 90° ( Thornton 1984 : fig. 154)..................................................................... Ceratostigma lisae ( Thornton, 1984 ) comb. n. - Cells r3 and r5 brown; radial fork with branches diverging at an angle of about 90°................................. 6 6 Basal one-fifth of the forewings with a slightly curved grayish white stripe; pigmented area in egg guide flatted at tip ( Figs 8, 14–15 )...................................................................... Ceratostigma gracilis Li, 2002 - Basal one-fifth of the forewings with a V-shaped grayish white marking; pigmented area in egg guide pointed at tip ( Figs 34 , 43–44 )........................................................................ Ceratostigma stagona sp. n.