Ichthyurus davidi Gestro, 1892

Ichthyurus davidi Gestro, 1892

Figs 1 C ‒ D View Figure 1 , 3 E ‒ H View Figure 3 , 4 View Figure 4 , 8 B View Figure 8

Ichthyurus davidi Gestro, 1892: 1038.

Type material examined.

Holotype • 1 ♀ ( MGI), [h] “ Kian-si / A. David / D. oberth ”, [h] “ Davidii / Gestro ”, [p] “ Typus ”.

Additional material examined.

China, Anhui • 2 ♂♂ 1 ♀ ( IZAS), Jinzhai, Qingshan , 3‒7. VI. 2009, Zhishu Xiao leg. Fujian • 1 ♂ ( IZAS), Chongan, Xingcun , 900‒1000 m alt., 7. VII. 1960, Yiran Zhang leg. • 2 ♂♂ ( IZAS), Chongan, Xingcun, Guadun , 950‒1210 m alt., 12. VI. 1960, Yong Zuo leg. • 1 ♂ ( IZAS), Chongan, Xingcun, Guadun , 1000‒1200 m alt., 2. VI. 1960, Shengqiao Jiang leg. • 1 ♂ 1 ♀ ( IZAS), Wuyishan, Tongmu, Qiliqiao , 818 m alt., 23. V. 2018, Yuanyuan Lu & Yandong Chen leg. • 1 ♂ ( MHBU), Wuyishan , 5. VII. 2003, Ming Bai & Guodong Ren leg. • 1 ♂ ( IZAS), “ Guihe Vill Meihua Mt. Fujian Prov. alt. 1200 m, 4 - VI- 2007, HUANG & XU leg. ” • 1 ♀ ( IZAS), Chongan, Xingcun, Guadun , 1140 m alt., 2. VII. 1960, Fuji Pu leg. • 1 ♀ ( IZAS), Chongan, Xingcun, Sangang , 740‒900 m alt., 7. VII. 1960, Yiran Zhang leg. • 1 ♀ ( IZAS), Jianyang, Huangkeng , 900‒1170 m alt., 5. VII. 1960, Fuji Pu leg. Guangxi • 1 ♂ 1 ♀ ( IZAS), Longsheng, Huaping , 1420 m alt., 20. VI. 1963, Chunguang Wang leg. • 1 ♂ ( IZAS), Longsheng, Huaping , 1420 m alt., 22. VI. 1963, Shuyong Wang leg. • 1 ♂ 1 ♀ ( IZAS), Longsheng, Neicujiang , 840 m alt., 6‒7. VI. 1963, Shuyong Wang leg. • 1 ♂ ( IZAS), Longsheng, Hongtan , 900 m alt., 14. VI. 1963, Shuyong Wang leg. • 1 ♂ ( IZAS), Longsheng, Hongmaochong , 900 m alt., 10. VI. 1963, Chunguang Wang leg. • 2 ♀♀ ( IZAS), Longsheng, Baiyan , 1150 m alt., 19‒20. VI. 1963, Shuyong Wang leg. Guangdong • 4 ♂♂ ( MHBU), Nanling , 20 - V- 2021, Younan Wang leg.

Re-description.

Body length (both sexes): 7.4‒8.0 mm; body width (both sexes): 1.5‒1.6 mm.

Male (Fig. 1 C View Figure 1 ). Colouration. Body black, head yellow before antennal sockets, antennomeres I ‒ III yellow, prosternum yellow, pronotum yellow with a large nearly square black marking in middle of disc, scutellum yellow, elytra yellow around bases including humeri and at apices, legs yellow at trochanters and basal 1 / 3 parts of profemora, 1 / 2 parts of mesofemora and 2 / 3 parts of metafemora, abdomen yellow posteriorly and laterally.

Eyes large, interocular distance approximately half of the diameter of an eye. Antennae reaching elytral apex, antennomere II ca. 1 / 4 length of I, III ‒ XI subequal in length and ca. 3.0 times longer than II.

Pronotum 1.2 times as wide as long, anterior margin arcuate, lateral margins parallel, posterior margin bisinuate, anterior angles truncate, posterior angles nearly rectangular.

Elytra 1.5 times longer than wide, ca. 2.3 times longer than pronotum, with lateral margins nearly straight, sutural margins nearly straight and slightly dehiscent from the basal 1 / 4 part, distance between sutural margins as wide as apical width of an elytron, apices rounded.

Pro- and meta-thoracic legs slender and simple (Fig. 1 C View Figure 1 ); mesotrochanter (Fig. 4 A View Figure 4 ) projecting, with an obtuse apical tooth, mesofemora (Fig. 4 A View Figure 4 ) strongly swollen, 2.5 times longer than wide, without any tooth ventrally, mesotibiae (Fig. 4 A View Figure 4 ) slightly dilated in middle, each with a finger-like process at apex.

Terminal abdominal tergite (Fig. 4 C View Figure 4 ) ca. 1.5 times longer than wide, with postero-lateral projections ca. 1 / 4 length of the tergite, feebly arcuate at inner margins, moderately arcuate at outer margins. Proctiger (Fig. 4 C View Figure 4 ) peach-shaped and evenly sclerotised, surrounded by paraproct; paraproct (Fig. 4 C View Figure 4 ) strongly developed and tubular, feebly shrunk apically, nearly straight at dorso-posterior margin, tergal flange (destroyed and missing).

Terminal abdominal ventrite (Fig. 4 E View Figure 4 ) trilobed, nearly as long as wide, fissured in middle of apical 1 / 3 part, with lateral lobes nearly straight and diverging posteriorly at inner margins, arcuate at outer margins, rounded at outer apical angles, acute at inner apical angles, triangularly emarginate at posterior margins.

Abdominal sternite IX (Fig. 8 B View Figure 8 ) moderately sclerotised and subparallel-sided, approximately twice longer than wide, with posterior margin obliquely truncate, posterior right angles rectangular and left angles widely rounded, anterior left angle small beak-shaped and right angle strongly protruding anteriorly, slightly expanded and rounded at apex.

Aedeagus (Fig. 3 E ‒ H View Figure 3 ): right paramere short and snail-shaped, acute at apex, as long as wide (Fig. 3 E, H View Figure 3 ); left paramere largely hooked at apex (Fig. 3 F, G View Figure 3 ), almost vertically stepped near apical 1 / 3 part of outer side (Fig. 3 E, H View Figure 3 ), ca. 3.0 times longer than right paramere; setifore extension developed and moderately sclerotised, ca. 1 / 3 length of left paramere (Fig. 3 F, G View Figure 3 ); median lobe ca. 1.5 times longer than tegmen, progressively narrowed basally (Fig. 3 E, H View Figure 3 ).

Female (Fig. 1 D View Figure 1 ). Similar to males, but body larger, eyes less protruding, legs yellow at basal 1 / 2 parts of pro- and metafemora, mesothoracic legs slender and simple; terminal abdominal tergite (Fig. 4 D View Figure 4 ) ca. 1.3 times longer than wide, with postero-lateral projections ca. 1 / 3 length of the tergite; terminal abdominal ventrite (Fig. 4 F View Figure 4 ) nearly as long as wide, widest near middle, rounded at lateral margins and confluent with outer apical angles, shallowly and roundly emarginate in middle of posterior margin.

Distribution.

China ( Jiangxi, Anhui, Fujian, Guangxi, Guangdong).