Rhyncocheilus griseosericans ( Fairmaire, 1894 )

Tang, Liang, Schillhammer, Harald & Zhao, Xin, 2021, Notes on the genus Rhyncocheilus in China (Coleoptera, Staphylinidae Staphylininae) with descriptions of three new species, Zootaxa 4948 (1), pp. 99-112 : 104

Rhyncocheilus griseosericans ( Fairmaire, 1894)

( Figs 7, 8 , 22–24 , 42–49)

Emus griseosericans Fairmaire, 1894: 217 .

Rhyncocheilus griseosericans: Coiffait, 1974: 383 ; Schillhammer; 2012: 199.

Material examined. China: Sichuan: 1³ 6♀♀, Tianquan County, Erlangshan , alt. 2000 m, 15–21.VIII.2011, Huang Hao leg. ( SHNU) ; 3³³ 2♀♀, Emei Mt., Jiulinggang , 29°34′N, 103°21′E, alt. 1900–2000 m, 1–9.VIII.2012, Huang Hao leg. ( SHNU, NMW) ; 2³³ 4♀♀, Emeishan Mt., Jiulinggang , 29°34′N, 103°21′E, alt. 1900 m, 25.VII.2012, Peng, Dai & Yin leg. ( SHNU) ; 1♀, Emeishan Mt., Huayanding , 29°33′N, 103°21′E, alt. 1900 m, 22.VII.2012, Peng, Dai & Yin leg. ( SHNU) .

Measurements. Male: BL: 15.7–21.4 mm, FL: 11.0– 12.1 mm. HL: 2.89–3.17 mm, HW: 2.89–3.06 mm, EYL: 1.00– 1.22 mm, TL: 1.22–1.45 mm, PL: 2.78–2.89 mm, PW: 2.78–2.95 mm, EL: 4.56–5.34 mm, EW: 4.78–5.45 mm. HW/HL: 0.95–1.04, TL/EYL: 1.09–1.44, PL/PW: 0.94–1.00, EL/EW: 0.84–1.01.

Female: BL: 19.0– 26.1 mm, FL: 12.3–14.7 mm. HL: 3.39–3.89 mm, HW: 3.22–3.56 mm, EYL: 1.00– 1.22 mm, TL: 1.72–2.00 mm, PL: 3.11–3.61 mm, PW: 3.22–3.67 mm, EL: 5.56–6.17 mm, EW: 5.17–6.39 mm. HW/HL: 0.87–0.97, TL/EYL: 1.52–1.83, PL/PW: 0.95–1.02, EL/EW: 0.93–1.09.

Distribution. China (Sichuan).

Diagnosis. The species was described from a single female from Ya’an, and the detailed locality is unknown. The locality, Erlangshan of Tianquan County, is very close to Ya’an, and the specimens from there do not differ from the holotype in appearance. Therefore, we regard the specimens listed here as true Rhyncocheilus griseosericans ( Fairmaire, 1894) . The specimens from Emeishan of Sichuan are identical to those from Erlangshan of Tianquan County externally, though the apical portion ( Fig. 48 ) of aedeagal median lobe is somewhat different, which may be considered to be within the variability range of the species. Schillhammer (2012) redescribed R. griseosericans based on the holotype and specimens from Hailuogou of Sichuan, however, those specimens from Hailuogou belong to a new species which is described herein as Rhyncocheilus gonggashanus sp. nov. For differences between those two species see the comparative description below. Rhyncocheilus griseosericans ( Fairmaire, 1894) is also very similar in appearance to R. sommersgutteri Schillhammer, 2004 described from Liziping of Sichuan, except for the darker body color and the shorter silvery pubescent patches on the elytra.

Figures

FIGURES 7–12. Habitus. 7, 8—Rhyncocheilus griseosericans; 9, 10—R. gonggashanus; 11, 12—R. yangxiaodongi. Scale bars: 2 mm.

FIGURES 22–29. 22–24—Rhyncocheilus griseosericans; 25–27—R. gonggashanus; 28, 29—R. yangxiaodongi; 22, 25, 28— male head; 23, 26—female head; 24, 27, 29—Labrum. Scale bars: 1 mm.

FIGURES 46–53. Aedeagal characters. 46–49—Rhyncocheilus griseosericans from Emeishan; 50–53—R. gonggashanus; 46, 50—aedeagus in lateral view; 47, 51—aedeagus in ventral view; 48, 52—apical portion of aedeagal median lobe in ventrolateral view; 49, 53—inner side of apical parameral portion. Scale bars: 0.5 mm.