Review of the Lycocerus pallidulus group (Coleoptera, Cantharidae), with descriptions of six new species from China Author Wang, Younan Key Laboratory of Zoological Systematics and Application, School of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding 071002, Hebei Province, China Author Liu, Haoyu https://orcid.org/0000-0003-1383-5560 Key Laboratory of Zoological Systematics and Application, School of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding 071002, Hebei Province, China liuhy@aliyun.com Author Yang, Xingke https://orcid.org/0000-0003-3676-6828 Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing, China Author Yang, Yuxia https://orcid.org/0000-0002-3118-6659 Key Laboratory of Zoological Systematics and Application, School of Life Science, Institute of Life Science and Green Development, Hebei University, Baoding 071002, Hebei Province, China yuxia0305@126.com text ZooKeys 2023 2023-08-29 1176 243 285 http://dx.doi.org/10.3897/zookeys.1176.107858 journal article http://dx.doi.org/10.3897/zookeys.1176.107858 1313-2970-1176-243 0EC468730B9C484C880371C49D89925F 77FF8CD616995BD6BB50F52F16CFAF44 Lycocerus laterophysus Y. Yang, Wang & Liu sp. nov. Figs 8A-C , 14D , 16H , 18A, B Type material. Holotype : ♂ (MHBU), China, Guangxi, Wuming, Damingshan, 1230-1423 m, 20.V.2011, leg. H. Y. Liu. Paratypes : China: 4♀1♂ (MHBU), same data as holotype; 2♀ (MHBU), same locality as holotype, 1100 m, 27.V.2011, leg. H. Y. Liu; 1♀ (MHBU), same locality as holotype, 600-900 m, 25.V.2011, leg. H. Y. Liu. Diagnosis. The new species can be easily distinguished from all others by its body coloration, head and pronotum bicolored, with vertex black and clypeus yellow, pronotum with a black wide longitudinal median band (Fig. 18A, B ). Also, its aedeagus is unique and differs from all others in the ventral process of each paramere expanded near base in lateral view (Fig. 8C ), and broad laterophyse in ventral view (Fig. 8A ). Figure 8. Aedeagus A-C Lycocerus laterophysus sp. nov. D-F L. flavipennis sp. nov. A, D ventral view B, E dorsal view C, F lateral view. Scale bars: 1.0 mm. Description. Male (Fig. 18A ). Head, prothorax and legs orange, vertex black, mandibles dark brown, antennomeres III-XI black, pronotum with a wide black longitudinal median band extending from posterior to anterior margins, scutellum black, elytra pale yellow, tarsi darkened, meso- and metasterna and abdomen black. Body densely covered with yellow recumbent pubescence. Head feebly narrowed behind eyes, surface densely and finely punctate; eyes moderately large and protruding, head width across eyes feebly wider than anterior margin of pronotum; antennae filiform, extending to elytral mid-length when reclined, antennomere II shortest, ~ 2.5 x longer than wide at apex, III-V feebly widened apically, IV-X each with a short smooth impression near apical part of outer margin, V longest, VI-XI nearly parallel-sided, XI acute at apex. Pronotum distinctly longer than wide, anterior margin feebly arcuate, lateral margins subparallel, posterior margin nearly straight, anterior angles rounded, posterior angles right-angled, disc convex on posterolateral parts, surface finely and feebly sparsely punctate than that on head. Elytra ~ 4.5 x longer than pronotum, 5.4 x longer than width across humeri, outer margins nearly parallel, disc semi-lustrous, coarsely and densely punctate. Legs slender, all tarsal claws simple. Aedeagus: basal piece nearly as long as dorsal plate of each paramere (Fig. 8A-C ); ventral process of each paramere slender, feebly bent inwards and approaching each other in ventral view (Fig. 8A ), slightly expanded near base and bent ventrally in lateral view (Fig. 8C ); dorsal plates of parameres obviously longer than ventral process (Fig. 8A, C ), with apical margins arcuate and descending inwards in dorsal view (Fig. 8B ); laterophyse nearly as long as ventral process and broad in ventral view, with apices acute and directing dorso-outwards (Fig. 8A, C ). Female (Fig. 18B ). Similar to the males, but eyes less protruding, antennae thinner and shorter, extending to basal one-third length of elytra when reclined, middle antennomeres without impressions, fore and middle legs with a digitiform tooth on each anterior claw, pronotum feebly longer than wide. Internal organ of reproductive system (Fig. 14D ): spermatheca feebly shorter than diverticulum; accessory gland ~ 2.5 x longer than spermatheca. Abdominal sternite VIII (Fig. 16H ): hardly emarginate in middle and subtriangular emarginations on both sides of posterior margin, lateral emarginations obviously deeper than the middle one, the portion between lateral and middle emarginations wide and rounded at apices, obviously extending over apices of latero-apical angles, which are subrounded. Body length: 9.3-9.7 mm (9.3 mm in holotype); width: 1.8-2.0 mm (1.8 mm in holotype). Distribution. China (Guangxi). Etymology. The new species is named after the quite wide laterophyse of its aedeagus.