Figures 17 - 22 in A new species of Laccobius Erichson, 1837 (Hydrophilidae, Coleoptera) from the Chinese Himalaya, with comments on taxonomic status of subgenera Glyptolaccobius Gentili, 1989 and Cyclolaccobius Gentili, 1991 and additional faunistic records from China
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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. 1Elytra with distinct parasutural furrows2-Elytra without distinct parasutural furrows32Body 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 & Jia3Body 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 apically44Apical part of the median lobe without series of fine setae. Elytra completely black at the base. Species from Hainan and Taiwan5-Apical part of the median lobe with series of fine setae. Elytra with or without pale basal spots. Continental species65Median lobe strongly constricted subapically (Jia et al. 2013: figs10-12). HainanL. hainanensis Jia, Gentili & Fikáček-Median lobe indistinctly constricted subapically (Jia et al. 2013: figs 14-16). TaiwanL. politus Gentili6Elytral 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
图版17~22展示与墨脱小粒龙虱（Laccobius motuoensis sp. nov.）近缘的物种雄性外生殖器。其中17~19为锡氏小粒龙虱（L. sipeki Gentili & Fikáček）的正模标本：(17) 腹面观，(18) 侧面观，(19) 腹面观。20~22为云南小粒龙虱（L. yunnanensis Gentili）的采自中国云南省热海温泉的标本（馆藏于NMPC）：(20) 中叶顶端半部细节，(21) 腹面观，(22) 侧面观。 1. 鞘翅具明显的亚脊沟（parasutural furrows）…………………………………………………………2 鞘翅无明显的亚脊沟………………………………………………………………………………3 2. 虫体体长2.7~2.9 mm；鞘翅基部无淡黄色斑点；雄性外生殖器中叶（median lobe）亚顶端侧面具粗刺列（Jia等，2013：图3~5）——秦岭小粒龙虱（L. qinlingensis Jia, Gentili & Fikáček） 虫体体长1.8~2.1 mm；鞘翅基部具2或4枚明显的淡黄色斑点；雄性外生殖器中叶亚顶端侧面无粗刺列（Zhang & Jia，2017：图6、7）——殷氏小粒龙虱（L. yinziweii Zhang & Jia） 3. 虫体体长2.0~2.8 mm；鞘翅边缘与缘折（epipleura）基部膨大；雄性外生殖器中叶顶端狭尖（Gentili，1995：图52、53）——光亮小粒龙虱（L. nitidus Gentili） 虫体体长1.8~2.1 mm；鞘翅边缘与缘折基部不膨大；雄性外生殖器中叶顶端圆形……………………4 4. 雄性外生殖器中叶顶端无细毛列；鞘翅基部完全黑色；分布于海南与台湾………………………5 雄性外生殖器中叶顶端具细毛列；鞘翅基部具或不具淡黄色基斑；为大陆分布物种……………6 5. 雄性外生殖器中叶亚顶端强烈缢缩（Jia等，2013：图10~12）；分布于海南——海南小粒龙虱（L. hainanensis Jia, Gentili & Fikáček） 雄性外生殖器中叶亚顶端不明显缢缩（Jia等，2013：图14~16）；分布于台湾——光滑小粒龙虱（L. politus Gentili） 6. 鞘翅刻点列全程规整；主刻点列（primary series of punctures）明显较次生刻点列粗大浓密；雄性外生殖器中叶顶端半部宽度大致均一（图5、6）——墨脱小粒龙虱（L. motuoensis sp. nov.） 鞘翅刻点列基部略显紊乱，部分次生刻点至少与主刻点列刻点等大；雄性外生殖器中叶顶端明显加宽（图20~22）——云南小粒龙虱（L. yunnanensis Gentili）
