A taxonomic revision of the silphaeformis species-group of the genus Tachinus Gravenhorst (Staphylinidae, Tachyporinae) from China Author Feng, Ting Author Schuelke, Michael Author Li, Li-Zhen text ZooKeys 2013 359 53 99 http://dx.doi.org/10.3897/zookeys.357.5861 journal article http://dx.doi.org/10.3897/zookeys.357.5861 1313-2970-359-53 B3B8D706F2FB45F5B20EEE93BC611AD5 B3B8D706F2FB45F5B20EEE93BC611AD5 Tachinus (s. str.) jiuzhaigouensis Feng, Li & Schuelke sp. n. Figs 3C, 3D, 9F, 10F, 11F, 13F, 15F, 18F, 20F, 21F Type locality. China, Sichuan, Aba A. R., Nanping, Jiuzhaigou Natural Reserve. Type material. Holotype: ♂, CHINA: Sichuan Prov., Aba A. R., Nanping County, Jiuzhaigou, 27.vii.2001, LI & ZHAO leg. (SNUC). Paratypes: ♂, same label data as holotype (SNUC); ♂, CHINA: Sichuan Prov., Jiuzhaigou Natural Reserve, 12-17.vi.2000, leg. E. Kucera (cFel); 4 ♂♂, 6 ♀♀, CHINA: Sichuan, Jiuzhaigou, 15.vi.-18.vi.2011 leg. Kucera (cSch). Description. Measurements of holotype: BL 3.61 mm; FL 2.61 mm;PL 0.78 mm; EL 1.17 mm; SEL 0.06; HW 0.72 mm; PW 1.22 mm; EW 1.33 mm; relative length of antennomeres I-XI : 20: 10: 12: 7: 8: 10: 10: 10: 9: 10: 21. Measurements of females: BL 3.57-3.81; FL 2.82-3.08; PL 0.79-0.83; EL 1.29-1.44; SEL 0.20-0.30; HW 0.73-0.74; PW 1.22-1.26; EW 1.34-1.39; relative length of antennomeres I-XI : 24: 14: 16: 10: 14: 14.5: 14: 14: 13: 12.5: 26. Body (Fig. 3C, 3D) brown to black; head and pronotal disc black; lateral margins of pronotum yellow; elytra, posterior margin of each abdominal tergite and legs reddish brown; mouthparts and basal antennomeres black or dark brownish. Head slightly transverse, HW: PW = 0.58-0.60, punctation fine and sparse, microsculpture consisting of irregular striae on disc, more transverse in posterior portion. Antennomeres X shorter than wide. Pronotum: PL: PW = 0.64-0.66; surface with fine and sparse punctation, microsculpture indistinct, reduced to irregular transverse striae. Elytra : EL: PL = 1.50, EL: EW = 0.88, EW: PW = 1.09 in male; EL: PL = 1.61-1.74; EL: EW = 0.93-1.04; EW: PW = 1.08-1.11 in females; punctation shallow, coarser than that of pronotum. Male. Surface of elytra with microsculpture similar to that of pronotum, often almost completely reduced. Sternite VII (Figs 9F, 10F) as in Tachinus lohsei , apical margin of emargination more rounded, hand-shaped projection more slender, in posterior view apical margin bent dorsad. Tergite VIII as in Fig. 11F. Sternite VIII as in Fig. 13F. Median lobe of aedeagus (Fig. 15F) shorter and slightly broader than parameres. Parameres in lateral view straight, not curved ventrad in apical half, apex of parameres angular in ventral view. Female. Elytra distinctly longer than in male (Fig. 3D), inner part of posterior margin produced, forming a distinct angle. Surface with distinct microsculpture composed of irregular transverse striae in the anterior portion and of irregular meshes in posterior portion. Abdominal tergite VIII (Fig. 18F) trilobed, similar to that of Tachinus lohsei , median lobe at least as long as lateral ones, lateral lobes broad and each with one pair of long setae. Sternite VIII (Fig. 20F) with six lobes, fimbriate median lobes separated by deep and narrow emargination. Etymology. The specific name (adjective) is derived from "Jiuzhaigou" , the type locality of this species. Remarks. Tachinus jiuzhaigouensis can be easily separated from the other species of the group by its small size, the broadly yellow lateral margins of the pronotum and the primary and secondary sexual characters. The species is very similar to Tachinus lohsei , but the male is distinguished by the more angular apical part of the parameres, the female by the different shape of the median lobe of tergite VIII.