Dianous siamensis Rougemont, 1983

Tang, Liang & Huang, Meng-Chi, 2018, Notes on the Dianous bimaculatus complex with description of a new species from China (Coleoptera, Staphylinidae), Zootaxa 4527 (4), pp. 560-568 : 566

Dianous siamensis Rougemont, 1983

( Figs. 5 , 34–40 )

Dianous siamensis Rougemont, 1983: 13 ; Puthz, 2000: 427; Puthz, 2016: 751 .

Material examined. China: Yunnan: 1♂, Nabanhe N. R., Nabancun, 7.I.2004, Li & Tang leg. (SHNU); 5♂♂ 13♀♀, Nabanhe N. R., Manfei, 9.I.2004, Li & Tang leg. ( SHNU) ; 3♂♂ 1♀, Nabanhe N. R., Guomenshan, 5.I.2004, Li & Tang leg. ( SHNU) ; 1♂ 1♀, Nabanhe N. R., Manfei, 22°09′N, 100°41′E, alt. 620 m, 18.XI.2008, Hu & Tang leg. ( SHNU) ; 1♂, Nabanhe N. R., Guomenshan, 22°14′N, 100°36′E, alt. 1100 m, 21.XI.2008, Hu & Tang leg. ( SHNU) .

Measurements. BL: 4.6–4.9 mm, FL: 2.6–2.8 mm. HW: 0.93–0.97 mm, PL: 0.76–0.81 mm, PW: 0.66–0.71 mm, EL: 1.12–1.18 mm, EW: 0.97–1.03 mm, SL: 0.97–1.03 mm. Head 0.91–0.96 times as wide as elytra, pronotum 1.11–1.16 times as long as wide, elytra 1.11–1.17 times as long as wide.

Distribution. China (Yunnan), Myanmar, Thailand, Vietnam.

Remarks. The species can be easily distinguished from other species of the complex by bicolor femora except D. bellulus and D. hajekianus , from latter two by smaller elytral spots and different shape of apex of aedeagal median lobe.

Figures

FIGURES 1–6. Habitus. 1 Dianous bimaculatus 2 D. flavoculatus 3 D. hubeiensis 4 D. hainanensis 5 D. siamensis 6 D. strabo. Scale bars: 1mm.

FIGURES 34–40. Sexual characters of Dianous siamensis. 34 male tergites IX and X 35 male sternite VIII 36 male sternite IX 37 aedeagus 38 female tergites IX and X 39 female sternite VIII 40 valvifers. Scale bars: 0.25mm.