Hexarhopalus (Leprocaulus) bisinuatus Ren & Xu 2011, sp. n.

Hexarhopalus (Leprocaulus) bisinuatus sp. n. (Figs 8–16, 18)

Material examined. Holotype: male, CHINA: Guizhou Province, Leigongshan, 13 September 2005, Haoyu Liu leg. Paratypes: 1 male, CHINA: Guizhou Province, Leigongshan, Lianhuaping, Alt. 1450–1500 m, 15 September 2005, Lihong Zhu leg., 1 female; CHINA: Guizhou Province, Leigongshan, 15 September 2005, Fuming Shi leg.; 1 female, CHINA: Guizhou Province, Jiangkou County, Fanjingshan, 29 July 2001, Guodong Ren leg.

Condition of holotype. Right protarsus and metatarsus are missing.

Description. Male (Fig. 18). Body elongate (length 13.4–14.3 mm, width 4.5–5.0 mm), subcylindrical, winged, dull shiny; labrum, claws, tibiae, 1st–7th antennal segments blackish brown, 8th–11th segments pale brown, the rest uniformly black.

Head widest across eyes, 0.69–0.70 (0.70 on average, n = 2) times as wide as pronotum, finely punctate, punctures on genae and anterior half of clypeus denser than those on frons. Frontoclypeal suture well developed, deep, reaching clypeal anterior margins. Distance between eyes 1.33–1.35 (1.34 on average, n = 2) times as wide as the transverse diameter of an eye (in dorsal view). Ocular sulcus deep, reaching posterior margin of eyes. Anterior edge of clypeus nearly straight. Labrum transverse, covered with long yellow setae anteriorly and laterally. Antennae (Fig. 14) slightly filiform, 1.15–1.21 (1.18 on average, n = 2) times as long as pronotum, entirely pubescent; five distal segments slightly dilated, with shallow sensory pores and dense sensory setae; ratio of the length (width) of 2nd–11th segments 6 (8):22 (8):16 (8):16 (8):16 (8):16 (8):15 (11):13 (12):12 (12):17 (13). Mentum obtrapezoidal, with a tubercle-like elevation in middle, which is directed forwards; each lateral side of elevation with a broad groove, respectively.

Pronotum semicordiform, broadest at anterior third, 1.03–1.04 (1.04 on average, n = 2) times as wide as long; medio-longitudinal groove distinct only in the middle, not reaching anterior and posterior margins of pronotum; disc strongly convex laterally, completely punctate, with a diagonal depression at the rear of swellings; some larger punctures situated between basal groove and diagonal depressions; lateral carina visible only in the anterior half, rudimental posteriorly; oblique indentation in posterior angles deep, somewhat long, running anteriad to the mildle point just above lateral carina, then the indantation obliterated, indentation also running posteriad and sharply connected with basal groove; prothoracic hypomeron dull shiny, shagreened and finely wrinkled. Prosternum finely wrinkled, prosternal process weakly depressed between coax and wrinkled apically. Scutellum punctate, small, triangular.

Elytra subparallel-sided, with developed shoulders, 1.90–2.01 (1.96 on average, n = 2) times as long as its width, 2.83–2.87 (2.85 on average, n = 2) times longer and 1.38–1.43 (1.41 on average, n = 2) times wider than pronotum, broadest at posterior third, slightly raised posteriad, and curved downward close in apical fourth; scutellary striole long; striae consist of row of well separated punctures, but the punctures variable in size; punctures in rows finer in the middle and the rear than those at the base and sides; interstices shagreened, flattened to convex, clearly convex at basal and lateral portions, 4th interstice highest; basal rim slightly carinate in first to fourth interstices; epipleuron narrow, smooth, developed throughout length of elytra, slightly depressed and arched at the level of fourth abdominal ventrite, then bent to apex, decorated with fine rim in apical half.

Metasternum 1.75–1.82 (1.79 on average, n = 2) times as long as mesocoxa, finely punctate and pubescent.

Legs densely punctate and completely pubescent, tibiae weakly wrinkled, with yellow-brown setae in apical half; femora pedunculate; ventral side of male protibiae (Fig. 13) slightly bisinuate in inner lateral view due to inner margin of ventral surface with a weak blunt projection near middle; pro-, mesotibiae gently arcuate; metatibiae near straight, thickened at apex.

Abdomenal sternites with punctures dense, punctures lager than those on metasternum; each lateral side of the first and second visible sternites with a round shallow depression; sternite VIII (Fig. 8) entirely densely covered with fine setae, emarginated at apical margin.

Aedeagus (Figs 10–12) faintly curved at base in lateral view, length 1.7 mm, width 0.4 mm; parameres short (length 0.9 mm, width 0.3 mm), regularly curved in apical part in lateral view. Spiculum gastrale (Fig. 9) relatively short, with large apical lobes.

Female. Ovipositor (Fig. 15) consists of paraprocts and coxites; paraprocts reduced, and partly enclose the base of the coxites, the baculi of the paraprocts nearly transverse; coxites 4-lobed; basal lobe elongate (length 1.6 mm), with a pair of longitudinal baculi, 2.50 times as long as three apical lobes combined; gonostyles with apices bearing a few cerci, attached dorsolaterally to coxites; spiculum ventrale (Fig. 16) with well-developed median shaft.

Etymology. The specific name is derived from the Latin word “bi” (two) + “sinuatus” (sinuate), to indicate to bisinuate protibiae.

Remark. This new species is similar to H. (Leprocaulus) punctithorax KASZAB, 1982, but differs from the latter by male profemora which is normal, without any projections, male protibiae which is slightly bisinuate due to inner margin of ventral surface with a weak blunt projection near the middle.

Distribution. China: Guizhou.