Megalinus boki ( Bordoni, 2000 )

ZHOU, YU-LINGZI, BORDONI, ARNALDO & ZHOU, HONG-ZHANG, 2013, Taxonomy of the genus Megalinus Mulsant & Rey (Coleoptera: Staphylinidae, Xantholinini) and seven new species from China, Zootaxa 3727 (1), pp. 1-66 : 30

Megalinus boki ( Bordoni, 2000)

(Fig. 8A–E; Fig. 8-1A–F)

Bordoni, 2000: 131 ( Lepidophallus ; Type locality: N. China: Shaanxi, Nan Wutai); Herman, 2001a: 3659 (catalog); Bordoni, 2002: 648 (redescriptions; characters; Sichuan, Yunnan, Guizhou, Zhejiang); Bordoni, 2003c: 268 (Yunnan, Sichuan, Guizhou, Zhejiang); Smetana, 2004: 689 (catalog; Guizhou, Sichuan, Shaan, Shanxi, Yunnan, Zhejiang); Bordoni, 2008: 58 ( Megalinus ; species list of Megalinus ).

Addtional material: one male, CHINA: Chongqing: Wushan co.: Liziping (E 110.0089, N 31.2005), 1850 m, 18. V .1994, collected by Li Wenzhu ( IZ-CAS) .

Male. Abdominal segment VIII entirely covered with setiferous punctures, except a narrow medial longitudinal impunctate band; posterior margins of tergite VIII slightly protruding backwards, that of sternite VIII distinctly protruding backwards medially (Fig. 8-1A, B). Tergite IX symmetrical, connected mediobasally. Sternite IX symmetrical, with bisinuate mediobasal margin and distinctly emarginated posterior margin (Fig. 8-1C). Tergite X with subtruncated base and emarginated apex (Fig. 8-1D), in situ broadly exposed between tergite IX. Median lobe of aedeagus broad, large sized (Fig. 8D, E; Fig. 8-1E, F), basal piece without transparent, membranous medial-longitudinal band; basal bulb 1.13 mm long; anterior portion short, tapered apically, nearly 1/10 of basal bulb length. Parameres symmetrical and thin, shorter than 1/3 of basal bulb length. Internal sac composing of four groups of symmetrical scales, central two groups 8-shaped, lateral two of four paired large notched structures.

Distribution. China (Sichuan, Shaanxi, Guizhou, Yunnan, Zhejiang).

Remarks. This species could be distinguished from its congeners by: 1) dorsal surface of head with round, deep and medium-sized punctures, interspaces between punctures 1–2 punctures’ diameter, which mixed with smaller punctures, mainly on anterior half, especially denser on frontal region; 2) mesoscutellum shiny, extensively covered with polygonal reticulum; 3) posterior margins of tergite VIII slightly protruding backwards, that of sternite VIII distinctly protruding backwards medially; 4) sternite IX symmetrical, with bisinuate mediobasal margin and distinctly emarginated posterior margin; 5) tergite X with subtruncated base and emarginated apex; 6) median lobe of aedeagus broad, large sized, basal piece without transparent, membranous medial-longitudinal band; basal bulb 1.13 mm long; anterior portion short, tapered apically, nearly 1/10 of basal bulb length; 7) internal sac composing of four groups of symmetrical scales, central two groups 8-shaped, lateral two of four paired large notched structures. Although this species possesses quite similar external morphologies (Fig. 8A–C) to Megalinus flavus (Bordoni) , the differences of above points 3–7 could be easily found between the two species.