A review of the Tachinus longicornis - group of the subgenus Tachinoderus Motschulsky (Coleoptera: Staphylinidae: Tachyporinae) from China Author Chang, Yuan Author Li, Li-Zhen Author Yin, Zi-Wei Author Schülke, Michael text Zootaxa 2019 2019-11-21 4545 4 478 494 journal article 27675 10.11646/zootaxa.4545.4.2 642ca789-19dd-4958-bfa9-78e79adfd842 1175-5326 2618275 D0434556-EFD1-4A78-87D4-1C89712A7B21 Tachinus ( Tachinoderus ) bilobus Chang, Li & Yin , new species Chinese Common Name: 双叶圆胸隐翅虫 ( Figs 1–2 , 12 ) Type material (19 exs). Holotype : CHINA : Ƌ: ‘ China : Hubei Prov., Shennongjia (神农架), Muyu (木鱼), 6.viii.2002 , Li & Tang leg.’ ( SNUC ) . Paratypes : CHINA : 4 ƋƋ, 4 ♀♀ : same label date as Holotype ; 4 ♂♂ , 1 ♀ : ‘ China : Sichuan Prov., Chengdu , Qingcheng Mt. (青城山), 20.vii.2003 , Li-Zhen Li leg.’; 1 ♂ , 4 ♀♀ : same label data, except ‘ 19.vii.2003 , Hu & Tang leg.’ (all in SNUC ) . Diagnostic description. Male. Habitus as in Fig. 1A ; TBL 3.82–4.14 mm , FBL 2.36–2.68 mm ; head, pronotal disc, elytra and abdomen black, antennomeres I–II, mouthparts, pronotal posterolateral areas and most parts of legs reddish-brown, tarsi yellowish-brown. Head sub-triangular, HL 0.33–0.42 mm , HW 0.75 mm , with microsculpture and finely punctures at posterior portion; eyes prominent, EyL 0.19–0.24 mm ; antenna elongate, AnL 2.17–2.26 mm , relative lengths of antennomeres I–XI: 1.25: 1: 1.75: 1.5: 1.5: 1.5: 1.5: 1.25: 1.25: 1: 1.75. Pronotum strongly transverse, PL 0.80–0.85 mm , PW 1.37–1.46 mm , PI = 0.58–0.59. Elytra slightly transverse, EL 1.18– 1.27 mm , EW 1.37–1.41 mm , EI = 0.86–0.90. Abdominal surface with microsculpture consisting of transverse waves; tergite VIII ( Fig. 2A ) with four short lobes, inner lobes much longer than outer ones; sternite VII ( Fig. 2B ) shallowly and broadly emarginate at middle along posterior margin, granules evenly arranged in sub-triangular area; sternite VIII ( Fig. 2C ) with two lobes, deeply incised in between, median length of sternite 0.65 times as long as depth. Length of aedeagus ( Fig. 2 D–E) 0.83 mm , parameres short and wide, each slightly angulate at apex in ventral view, slightly curved ventrally in lateral view. FIGURE 1. Habitus of Tachinus bilobus . A. Male. B. Female. Scale bar: 1.0 mm. FIGURE 2. Diagnostic features of Tachinus bilobus (A–E. Male. F–G. Female). A, F. Tergite VIII. B. Sternite VII. C, G. Sternite VIII. D–E. Aedeagus, in ventral (D) and lateral (E) view. Scale bar: 0.2 mm. Female. General habitus ( Fig. 1B ) similar to male. Measurements: TBL 4.00– 4.23 mm , FBL 2.64–2.82 mm , HL 0.38–0.47 mm , HW 0.80 mm , EyL 0.19 mm , AnL 2.12–2.26 mm , PL 0.85–0.89 mm , PW 1.37–1.55 mm , PI 0.57–0.58, EL 1.27–1.32 mm , EW 1.46–1.51 mm , EI 0.87–0.88. Tergite VIII ( Fig. 2F ) with four lobes, inner lobes slightly longer than outer ones, incision between inner lobes V-shaped, sternite VIII ( Fig. 2G ) with six lobes, fimbriate lobes longer than others. Comparative notes. Tachinus bilobus is similar to T. lobutulus (described below) and T . longicornis Motschulsky in sharing a stout aedeagus with relatively broad parameres. Tachinus longicornis is readily distinguishable from both former species by the parameres of the aedeagus being distinctly exceeding apex of the median lobe, while T . bilobus differs from T . lobutulus in the female tergite VIII with the inner lobes being longer than the outer ones (the inner lobes are much shorter than outer lobes in T . lobutulus ). Distribution. China : Hubei , Sichuan ( Fig. 12 ). Etymology. The new specific epithet refers to the bi-lobed male sternite VIII.