Ichthyurus bisignatus Pic, 1926

Ichthyurus bisignatus Pic, 1926

Figs 6 E View Figure 6 , 8 E View Figure 8 , 10 B View Figure 10 , 12 A ‒ B View Figure 12 , 13 View Figure 13 , 14 A ‒ D View Figure 14

Ichthyurus bisignatus Pic, 1926: 5.

Type material examined.

Holotype • 1 ♀ ( MNHN), [h] “ Hoa Binh ”, [h] “ bisignatus / n. sp. ”, [h] “ HOLOTYPUS ”.

Additional material examined.

China, Yunnan • 1 ♂ 1 ♀ ( IZAS), Menglongbanna, Mengsong , 1600 m alt., 25. IV. 1958, Fuji Pu leg. • 1 ♂ ( IZAS), same locality as the preceding, 1600 m alt., 25. IV. 1958, Shuyong Wang leg. • 1 ♂ ( IZAS), same locality as the preceding, 1600 m alt., 26. IV. 1958, Shuyong Wang leg. • 1 ♂ ( IZAS), same locality as the preceding, 1600 m alt., 25. IV. 1958, Chunpei Hong leg.

Re-description.

Body length (both sexes): 8.0‒ 8.1 mm; body width (both sexes): 1.5 mm.

Male (Fig. 12 A View Figure 12 ). Colouration. Body yellow, head with a black transverse marking on vertex, antennae black, except for yellow antennomeres I ‒ III; pronotum with a pair of black semi-rounded markings in middle of disc; elytra with a pair of longitudinal black stripes along lateral margins, except for humeri, as well as a pair of black ovate markings on basal parts of disc; leg black at tarsi and slightly darkened at tibiae; abdomen black, yellow laterally, terminal abdominal tergite with postero-lateral projections black at apices.

Eyes strongly protruding, interocular distance ca. 0.4 times of the diameter of an eye. Antennae extending to elytral apices, antennomere II ca. 1 / 4 length of I, III ‒ XI subequal in length and ca. 3.0 times longer than II.

Pronotum 1.1 times wider than long, anterior margin arcuate, lateral margins nearly parallel, posterior margin bisinuate, anterior angles feebly emarginate, posterior angles nearly rectangular.

Elytra 1.6 times longer than wide, ca. 2.4 times longer than pronotum, with lateral margins feebly sinuate, sutural margins feebly bisinuate and moderately dehiscent from the basal 1 / 3 part, distance between sutural margins as wide as apical width of an elytron, apices subrounded.

Pro- and metathoracic legs slender and simple (Fig. 12 A View Figure 12 ); mesotrochanters each with a small and acute tooth at apex (Fig. 12 A View Figure 12 ), mesofemora (Fig. 12 A View Figure 12 ) moderately swollen and smooth ventrally, without any tooth, mesotibiae each with an unciform process at apex (Fig. 6 E View Figure 6 ).

Terminal abdominal tergite (Fig. 13 A, C View Figure 13 ) ca. 1.2 times longer than wide, with postero-lateral projections very stout and short, ca. 1 / 8 length of the tergite, nearly straight at inner margins, and slightly arcuate at outer margins (Fig. 13 C View Figure 13 ). Proctiger (Fig. 13 C View Figure 13 ) peach-shaped and sclerotised apically, completely surrounded by paraproct; paraproct (Fig. 13 C View Figure 13 ) weakly developed and tubular, feebly shrunk apically, hardly emarginate in middle of dorso-posterior margin, tergal flange weakly sclerotised, expanded at base and narrowly protruding apically.

Terminal abdominal ventrite (Fig. 13 E View Figure 13 ) trilobed, ca. 1.2 times as long as wide, fissured in middle of apical 3 / 4 part, with lateral lobes moderately diverging posteriorly and sinuate at inner margins, arcuately ridged near inner margins, moderately arcuate at outer margins, rounded at apices.

Abdominal sternite IX (Fig. 8 E View Figure 8 ) weakly sclerotised and narrowed posteriorly, ca. 1.5 times longer than wide, with posterior margin truncate, posterior right angle rectangular and left angle widely rounded, anterior left angle small beak-shaped and right angle strongly protruding anteriorly.

Aedeagus (Fig. 14 A ‒ D View Figure 14 ): right paramere slender and cylindrical, acute at apex (Fig. 14 A, D View Figure 14 ); left paramere feebly bent in middle (Fig. 14 B, C View Figure 14 ), compressed laterally at apical half part and coarsely hooked at apex (Fig. 14 A, D View Figure 14 ), approximately twice longer than right paramere (Fig. 14 A, D View Figure 14 ); setifore extension developed and weakly sclerotised, 1 / 3 length of left paramere (Fig. 14 A, D View Figure 14 ); median lobe as long as tegmen, progressively narrowed basally (Fig. 14 A, D View Figure 14 ).

Female (Fig. 12 B View Figure 12 ). Similar to males, but body larger, eyes less protruding, mesothoracic legs slender and simple, elytra with narrower longitudinal black stripes; terminal abdominal tergite (Fig. 13 B, D View Figure 13 ) ca. 1.2 times longer than wide, with postero-lateral projections ca. 1 / 4 length of the tergite; terminal abdominal ventrite (Fig. 13 F View Figure 13 ) ca. 1.2 times as long as wide, widest near middle, rounded at lateral and posterior margins and confluent with latero-apical angles. Internal organ of the reproductive system (Fig. 10 B View Figure 10 ): bursa copulatrix tube-shaped at apex; accessory gland even in width at apical half part.

Distribution.

China (new record: Yunnan), Vietnam.