Figures 17-22. Male genitalia of the species similar to Laccobius motuoensis sp. nov. 17-19 L. sipeki Gentili & Fikáček, holotype (17 ventral 18 lateral 19 ventral) 20-22 L. yunnanensis Gentili, specimen from China: Yunnan: Rehai Hot springs (coll. NMPC) 20 detail of the apical half of medial lobe 21 ventral view 22 lateral view.

1	Elytra with distinct parasutural furrows	2
-	Elytra without distinct parasutural furrows	3
2	Body length 2.7-2.9 mm; elytra without pale yellow spots at base; median lobe bearing lateral subapical rows of stout spines (Jia et al, 2013: figs 3-5)	L. qinlingensis Jia, Gentili & Fikáček
-	Body length 1.8-2.1 mm; base of elytra with two or four distinct pale yellow spots; median lobe without lateral subapical rows of spines (Zhang and Jia 2017: figs 6, 7)	L. yinziweii Zhang & Jia
3	Body length 2.0-2.8 mm; elytral borders and epipleura are swollen at base; median lobe narrowly pointed apically (Gentili 1995: figs 52, 53)	L. nitidus Gentili
-	Body length 1.8-2.1 mm; elytral borders and epipleura are not swollen at base; median lobe rounded apically	4
4	Apical part of the median lobe without series of fine setae. Elytra completely black at the base. Species from Hainan and Taiwan	5
-	Apical part of the median lobe with series of fine setae. Elytra with or without pale basal spots. Continental species	6
5	Median lobe strongly constricted subapically (Jia et al. 2013: figs10-12). Hainan	L. hainanensis Jia, Gentili & Fikáček
-	Median lobe indistinctly constricted subapically (Jia et al. 2013: figs 14-16). Taiwan	L. politus Gentili
6	Elytral series regular throughout; primary series of punctures distinctly stronger and coarser than secondary ones; median lobe ca. of the same width in apical half (Figs 5, 6)	L. motuoensis sp. nov.
-	Elytral series somewhat irregular at base, with some secondary punctures at least as large as those on primary series; median lobe distinctly widened apically (Figs 20-22)	L. yunnanensis Gentili