Ichthyurus platyurus Gestro 1906

Ichthyurus platyurus Gestro, 1906 Figs 5 A, B, 6 A, 7, 8 C, 9 A ‒ D, 10 A Ichthyurus platyurus Gestro, 1906 b: 295, figs 18‒20. Type material examined. Holotype • 1 ♀ (MGI), [h] “ Momeit / Doherty / Mus. Br. 1906 ”, [h] “ platyurus / Gestro ”, [h] “ platyurus / Gestro / typus / 8320 ”, [p] “ Typus ”, [p] “ ♀ ”. Additional material examined. China. Yunnan • 3 ♀♀ (IZAS), Xishuangbanna, Menga, 800 m alt., 1. VI. 1958, Shuyong Wang leg. • 1 ♀ (IZAS), same locality as the preceding, 1050‒1080 m alt., 4. VIII. 1958, Shuyong Wang leg. • 2 ♀♀ (IZAS), same locality as the preceding, 800 m alt., 1. X. 1958, Zhizi Chen leg. • 1 ♀ (IZAS), Xishuangbanna, Menghun, 750 m alt., 3. VI. 1958, Zhizi Chen leg. • 1 ♀ (IZAS), same locality as the preceding, 1200 m alt., 11. V. 1958, Yiran Zhang leg. • 1 ♂ 2 ♀♀ (NWAFU), Mengyang, 800 m alt., 6. VI. 1991, Yinglun Wang & Ruigang Tian leg. Re-description. Body length (both sexes): 9.4‒9.9 mm; body width (both sexes): 1.4‒1.6 mm. Male (Fig. 5 A). Colouration. Body yellow, head with a black transverse marking on vertex, antennae black, except for yellow antennomeres I ‒ III; pronotum with a median transverse black band; elytra with a pair of longitudinal black stripes along lateral margins, except for humeri; leg black at apical 1 / 3 parts of pro- and mesofemora, and 1 / 5 parts of metafemora, as well as all tibiae and tarsi; abdomen black ventrally and laterally, terminal abdominal tergite with postero-lateral projections black along basal parts of outer margins, whole length of inner margins and apices, as well as a pair of black bar-like markings at basal parts of dorsal sides. Eyes strongly protruding, interocular distance ca. 0.7 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 rounded, lateral margins diverging posteriorly, posterior margin bisinuate, anterior angles confluent with anterior and lateral margins, posterior angles nearly rectangular. Elytra 1.7 times longer than wide, ca. 2.9 times longer than pronotum, with lateral margins near straight, sutural margins distinctly sinuate and strongly dehiscent from the basal 1 / 3 part, distance between sutural margins twice as wide as apical width of an elytron, apices rounded. Pro- and meta-thoracic legs slender and simple (Fig. 5 A, B); mesotrochanters (Fig. 6 A) projecting, each with a cylindrical apical tooth; mesofemora (Fig. 6 A) strongly swollen, twice longer than wide, each with a large and sharp tooth in middle of ventral side, excavated at ventro-apical half part, where covered with very short and stout setae on surface, mesotibiae (Fig. 6 A) longitudinally ridged laterally, each with a shape tooth in middle, which opposite to the femoral tooth, mesotarsomere I lengthened and ca. 3.0 times longer than II. Terminal abdominal tergite (Fig. 7 A, C) ca. 4.0 times longer than wide, with postero-lateral projections dorso-ventrally flattened, ca. 5 / 7 length of the tergite, nearly straight at both inner and outer margins, feebly protruding posteriorly at apex (Fig. 7 C). Proctiger (Fig. 7 C) peach-shaped and sclerotised laterally, completely surrounded by paraproct; paraproct (Fig. 7 C) moderately developed and tubular, feebly shrunk apically, shallowly emarginate in middle of dorso-posterior margin, tergal flange weakly sclerotised. Terminal abdominal ventrite (Fig. 7 E) trilobed, nearly as long as wide, fissured in middle of apical half part, with lateral lobes nearly straight and moderately diverging posteriorly at inner margins, feebly arcuate at outer margins, widely rectangular at inner apical angles, rounded at outer apical angles, sinuate at posterior margins. Abdominal sternite IX (Fig. 8 C) weakly sclerotised and narrowed posteriorly, ca. 2.6 times longer than wide, with posterior margin rounded, posterior right and left angles rounded, anterior left angle small beak-shaped and right angle strongly protruding anteriorly, moderately expanded and rounded at apex. Aedeagus (Fig. 9 A ‒ D): right paramere slender and cylindrical, rounded at apex (Fig. 9 A, D); left paramere bent in middle (Fig. 9 B, C) and hooked at apex (Fig. 9 A, D), almost vertically stepped near apical 1 / 3 part of outer side (Fig. 9 A, D), approximately twice longer than right paramere; setifore extension developed and moderately sclerotised, swollen at apex, half the length of left paramere (Fig. 9 B, C); median lobe slightly longer than tegmen, widely rounded at apex (Fig. 9 A, D). Female (Fig. 5 B). Similar to males, but body larger, eyes less protruding, legs black at apical 1 / 3 parts of mesofemora and 2 / 3 parts of metafemora, profemora uniformly yellow, mesothoracic legs slender and simple; terminal abdominal tergite (Fig. 7 B, D) uniformly black, ca. 1.3 times longer than wide, with postero-lateral projections never flattened, approximately half length of the tergite; terminal abdominal ventrite (Fig. 7 F) ca. 1.2 times as long as wide, widest near middle, rounded at lateral margins and confluent with outer apical angles, feebly roundly protuberant in middle of posterior margin. Internal organ of the reproductive system (Fig. 10 A): bursa copulatrix elongate tube-shaped at apex; accessory gland even in width at apical half part. Distribution. China (new record: Yunnan), Myanmar.