Tachinus (s. str.) mengdaensis Feng, Li & Schuelke

Feng, Ting, Schuelke, Michael & Li, Li-Zhen, 2013, A taxonomic revision of the silphaeformis species-group of the genus Tachinus Gravenhorst (Staphylinidae, Tachyporinae) from China, ZooKeys 359, pp. 53-99 : 73-75

Tachinus (s. str.) mengdaensis Feng, Li & Schuelke sp. n. Figs 5C, 5D, 9J, 10J, 12A, 13J, 16D, 19B, 20K, 22A

Type locality.

China, Qinghai Province, Xining, Mengda Natural Reserve.

Type material.

Holotype: ♂, CHINA: Qinghai Prov., Xining City, Xunhua County, Mengda N. R., alt. 2,200-2,500 m, 24.vii.2004, HU, TANG & ZHU leg. (SNUC). Paratypes: 18 ♂♂, 27 ♀♀, same label data as the holotype (SNUC); 4 ♂♂, CHINA: Gansu Prov., Dagcanglhamo (= Langmusi), 34°04.6'N, 102°37.7'E, 3644 m, J. Hájek, D. Král & J. Růžička leg [date unknown]. (NMP, cSch); 3 ♂♂, 7 ♀♀, CHINA: Gansu Prov., Hue er Ge, 5 km SSW Luqu, 3,400 m, 13.vii.1994, A. Smetana leg. (cSme, cSch); ♂, ♀, CHINA: Gansu Prov., Xiahe env., 3,000-3,200 m, 28.vii.-3.viii.1993, W. Heinz leg. (cSme); ♀, CHINA: Sichuan Prov., S of Langmusi, forest, 3,400-3,500 m, 13-14.VII.1994, K.W. Anton leg. (cSme); 4 ♀♀, CHINA: Sichuan Prov., Langmusi, 3,600 m, 14.vii.1994, A. Smetana leg. (cSme, cSch); 5 ♂♂, 4 ♀♀, CHINA: Sichuan Prov., Langmusi, 3,500 m, 13.vii.1994, A. Smetana leg. (cSme, cSch).

Description.

Measurements of males (holotype): BL 4.23-4.34 (4.24); FL 2.84-2.95 (2.84);PL 0.88-0.90 (0.89); EL 1.28-1.33 (1.33); SEL 0.10-0.12 (0.12); HW 0.82-0.84 (0.83); PW 1.39-1.45 (1.45); EW 1.56-1.67 (1.56); relative length of antennomeres I–XI: 23: 15: 17: 10: 14: 16: 16: 16: 14: 14: 27. Measurements of females: BL 4.17-4.34; FL 3.34-3.50; PL 0.95-1.00; EL 1.45-1.50; SEL 0.16-0.18; HW 0.71-0.83; PW 1.39-1.50; EW 1.67-1.78; relative length antennomeres I–XI: 24: 14: 16: 10: 15: 14: 14: 15: 15: 16: 30.

Body (Figs 5C, 5D) reddish to dark brown; mouthparts, margins of pronotum and posterior margin of tergites reddish brown; basal four antennomeres and legs yellowish brown.

Head slightly transverse, HW: PW = 0.47-0.60 (0.57); surface with very fine and sparse punctation, sometimes invisible in the pronounced microsculpture; microsculpture consisting of irregular striae. Antennomeres X slightly shorter than wide.

Pronotum: PL: PW = 0.61-0.72 (0.61); surface with microsculpture consisting of transverse striae, punctation similar to that of head.

Elytra: EL: PL = 1.42-1.51 (1.49), EL: EW = 0.77-0.85 (0.85), EW: PW = 1.08-1.20 (1.08) in males; EL: PL = 1.45-1.58, EL: EW = 0.81-0.90, EW: PW = 1.11-1.28 in females; surface with more distinct punctation than head and pronotum, microsculpture consisting of transverse meshes.

Abdomen with fine punctation, microsculpture consisting of transverse waves.

Male. Posterior margin of sternite VII (Figs 9J, 10J) with broad triangular emargination medially, apical margin bent ventrad, with broad area of coarse granules. Tergite VIII as in Fig. 12A, all four lobes nearly fused, forming a sinuate apical margin. Sternite VIII as in Fig. 13J. Median lobe of aedeagus (Fig. 16D) broad and projecting beyond apices of parameres, apical portion of median lobe in lateral view with belt-shaped projection.

Female. Pronotum with microsculpture more distinct, forming more regular transverse meshes. Elytra distinctly longer than in male, apical margins broadly rounded. Tergite VIII (Fig. 19B) transverse, lobes nearly fused, posterior margin of median lobe broadly rounded, lateral lobes each with only one pair of long setae. Fimbriate median lobes of sternite VIII (Fig. 20K) separated by a shallow emargination, slightly shorter than sublateral lobes.

Etymology.

The specific name (adjective) is derived from “Mengda”, the type locality of this species.

Remarks.

This new species can be separated from the other species by the triangular emargination of the apical margin of the male sternite VII, the belt-like projection (lateral view) of the aedeagal median lobe, the shape of the aedeagal parameres, and the broadly rounded median lobe of the female tergite VIII.