Laccobius ( Microlaccobius ) politus Gentili, 1979: 46 Laccobius (Cyclolaccobius) politus : Gentili (1995: 257) Gentili (2003: 414) Hansen (1999: 132) Oocyclus flaveolus Hebauer & Wang, 1998: 41 L. politus Laccobius ( Glyptolaccobius ) politus : Jia et al (2019: 72) Review of the Taiwanese Laccobius Erichson, 1837 (Coleoptera: Hydrophilidae) with description of a new species Liu, Hsing-Che Fikáček, Martin Zootaxa 2021 2021-04-20 4963 3 587 599 8Y536 Gentili, 1979 Gentili 1979 [151,752,798,825] Insecta Hydrophilidae Laccobius Animalia Coleoptera 7 594 Arthropoda species politus Glyptolaccobius  ( Figs 10, 14, 26)      Laccobius( Microlaccobius) politus Gentili, 1979: 46.     Laccobius (Cyclolaccobius) politus: Gentili (1995: 257);  Gentili (2003: 414);  Hansen (1999: 132).     Oocyclus flaveolus Hebauer & Wang, 1998: 41. Synonymized with  L. politusby Gentili (2012).     Laccobius( Glyptolaccobius) politus: Jia et al(2019: 72).   Material examined.   TAIWAN: NANTOU: 7 spec., ( NMPC):  5.5 kmSSW of Hesheat Rd.07 23.55263°N 120.86947°E,  1070m.  16.V.2018. Fikáček, Liang, Liu& Minoshima.(2018-TW37);  15 spec., ( NMPC): wet concrete wall at Kaigao Rd.  4.25 kmSE of Heshe; 23.5641°N 120.91837°E.  15.V.2018. Fikáček, Liang, Liu& Minoshima.(2018-TW34);   CHIAYI: 1 spec., ( NMPC): track down to Yuntanwaterfall  3.5 kmW of Meishan township 23.5327417, 120.6557500;  850m  1.v.2019; Damaška, Fikáček, Liu& Tkočlgt. (2019-TW13).    NEwTAIPEI: 1 male, 3 spec.( HCLC, NCHU): Pingxi District, Wanggu Waterfall[ 望古瀑布],  30.III.2020. on the wet rock, Hsing-Che Liuleg.   HSINCHU: 2 males, 5 spec., ( HCLC): Emei Township[ 峨眉ė], Qixing Village[ 七ffl村], 24.656664°N 121.023909°E,  151m,  24.VIII.2020. on wet rock, Hsing-Che Liuleg.   TAICHUNG: Hepingdistr, Bashianshan Mts., beginning of Bashianshan Forest Rd.,  5.i.2018 24.19808°N 121.00115°E,  722 m, exposed wet concrete/stony wall at side of the road, Fikáček, Liang, Hsiao(2018-TW03).  Published records: New Taipei( Gentili 1979, 2003; Hebauer & Wang 1998); Hualien( Gentili 1995); Keelung, Kaohsiung( Hebauer & Wang 1998); Nantou( Gentili 2003, 2012).   Diagnosis.Body length 1.8–2.0 mm, maximum body width 1.2–1.3 mm. Body oval ( Fig. 10), strongly convex. Dorsal back, pronotum and elytra with lateral dark brown margin. Surface of pronotum and elytra with sparse white setae. Legs brown. Male genitalia( Fig. 14): Aedeagus 0.5 mmlong. Median lobe slender, wide basally, slightly narrowing towards midlength, apical rounded; parameres slightly shorter than median lobe or as long as median lobe, weakly narrowing at apex, narrowing towards basal, basal truncate.  Differential diagnosis.  Laccobius politusis similar to Chinese species of  L. hainanensis Jia, Gentili & Fikáček, 2013,  L. martini Jia, Song & Gentili, 2013and  L. motuoensis Jia, Chen & Fikáček, 2019. It can be differentiated from them by the dorsal surface with sparse white setae, median lobe indistinctly constricted subapically, and parameres narrower than median lobe, rounded apically. This species is the only inhabitant of wet rocks in Taiwan, as well as that only representative of the subgenus  Glyptolaccobiusin Taiwan. Therefore, this species can be easily distinguished from other Taiwanese species.   Distribution. China( Yunnan), Nepal, Taiwan( Fig. 27) ( Gentili 1979; Gentili 2003; Hebauer 2006; Jia et al. 2013, this paper).  Bionomics.All examined specimens were collected on wet rocks ( Fig. 26). 3107229302 2018-05-16 NMPC Fikacek & Liang & Liu & Minoshima. Taiwan 1070 23.55263 Rd. 1 120.86947 7 594 7 Nantou 3107229339 2018-05-15 NMPC Fikacek & Liang & Liu & Minoshima. Taiwan 23.5641 Kaigao Rd. 5 120.91837 7 594 15 Nantou 3107229332 2019-05-01 NMPC Damaska & Fikacek & Liu & Tkoc Taiwan 850 23.532742 Yuntan 1 120.65575 7 594 1 Chiayi 3107229333 2020-03-30 HCLC, NCHU Hsing-Che Liu Taiwan Wanggu Waterfall Pingxi District 7 594 4 1 New Taipei 3107229314 2020-08-24 HCLC Hsing-Che Liu Taiwan 151 24.656664 Qixing Village 1 121.02391 Emei Township 7 594 7 2 Hsinchu 3107229334 2018-01-05 Fikacek & Liang & Hsiao Taiwan Heping 722 24.19808 Bashianshan Forest Rd. 1 121.00115 Bashianshan Mts. 7 594 1 Taichung