Rihirbus sinicus Hsiao & Ren 1981

Gao, Feng, Zhao, Ping, Webb, Mick & Cai, Wanzhi, 2015, A taxonomic review of the polymorphic assassin bug genus Rihirbus Stål (Hemiptera: Reduviidae: Harpactorinae), Zootaxa 3963 (4), pp. 502-516 : 503-504

Rihirbus sinicus Hsiao & Ren 1981

( Figs 1–13 , 29, 30 )

Rihirbus sinicus Hsiao & Ren 1981: 494 ; Maldonado-Capriles 1990: 292; Putshkov & Putshkov 1996: 254; Cai & Yang 2002: 216; Aukema et al. 2013: 142.

Redescription. Colouration. Body yellowish brown or reddish brown to black with pale markings in female and almost black with several pale markings in male; some individuals with lateral sides of body slightly paler, reddish brown to black. Annular markings of sub-apical part of scapus, spot between ocelli, ventral surface of head, middle of prosternum of thorax, spot on basal ⅓ of fore tibiae, markings of fore femur, two annular markings on mid and hind femora, apical parts and markings of basal ⅓ of mid and hind tibiae dull yellow to brown; coxae, coxal cavity, pleuron (except black markings) yellowish brown to dark brown, or totally black; middle of abdomen ventrally reddish brown to brown; pronotum (except posterior and posterolateral margins paler), scutellum (except lateral margin paler) dull brown to black. Middle of corium and clavus, basal half of third to sixth abdominal connexival segments dark brown to black; abdomen ventrally greyish yellow to black.

Structure. Body of large size, slightly slender in males. Head, thorax (except glabrous region of anterior pronotal lobe), exterior sides of fore femora, mid and hind femora, scutellum, corium, ventral surface of abdomen clothed with procumbent short setae; scapus and pedicellus with oblique short setae, basiflagellomere and distiflagellomere with procumbent setae; legs with erect setae, under surface of fore femora densely with erect setae. Post-antennal tuber short and cone-shaped, apex slightly produced laterally and bent forward. Anterior pronotal angle obscure; anterior pronotal lobe with shallow glabrous impression, middle part with longitudinal sulcus, basal part laterally with two low indistinct protuberances; posterior pronotal lobe somewhat rough, discal part slightly concave and with longitudinal ridges; lateral pronotal angle and posterior angle round, posterior margin slightly convex or nearly straight; fore tibiae indistinctly bent in male; fore femur thickened, basal half indistinctly incurved; fore wing distinctly extending beyond abdominal tip in male and somewhat extending beyond abdominal tip in female; abdomen a little dilated in female and not dilated in male.

Pygophore elliptical ( Figs 5, 6 ); paramere clavate, basal part somewhat curved, apical half with long setae ( Figs 8, 9 ); basal plate of phallobase slightly thicker than plate bridge, pedicel short and wide ( Fig. 10 ); median pygophore process posteriorly angularly produced ( Figs 5, 6 ). Phallosome elliptic; dorsal phallothecal sclerite sclerotized, apical part gradually widened and concave in apex ( Figs 11–13 ); struts shown as Fig. 11 .

Measurements [♂ (n=4) / ♀ (n=5), in mm]. Body length 19.73–21.73 / 21.33–25.33 maximum abdomen width 3.87–4.00 / 4.13–5.67. Head length (including neck) 3.34 / 3.54–3.80; anteocular part length 1.20–1.33 / 1.33–1.53; postocular part length 1.33 / 1.53–1.67; synthlipsis length 0.53–0.80 / 0.80; interocellar space 0.47–0.87 / 0.60–0.70; antennal segments length I–IV= 9.67–10.01 / 8.67–10.01, 3.34 / 3.27–3.67, 5.60 / 6.14–6.34, 3.20 / 3.74–4.48; visible labial segments length I–III= 2.13–2.33 / 2.47–2.67, 1.00–1.13 / 1.33, 0.60 / 0.67. Anterior pronotal lobe length 1.40–1.47 / 1.33–1.67; posterior pronotal lobe length 2.27–2.53 / 2.47–3.00; maximum thorax width (including lateral pronotal spines) 4.34–4.87 / 4.40–5.54; scutellum length 1.33–1.53 / 1.33–1.80; hemelytron length 14.13–15.06 / 14.40–17.73.

Type materials. Holotype, ♀, “Fujian, Shaowu, Yanshan, 30-V-1965, Wang Liangchen leg.” (IOZ); allotype, ♂, “Fujian, Jianyang, Xiaohuangkeng, IV-1965 ” (IOZ).

Other materials examined. 2♀ “ China, Guizhou, Libo, Dongtang, Banzhai, 11-VI- 2005, 540 m, Zhao Ping leg.” ( CAU); 1♀, “ China, Guizhou, Libo, Yongkang, Shuizu, Yaolan, 12-VI-2005, Zhao Ping leg.” ( CAU); 1♀, “ China, Guangxi, Longsheng, Huaping, 12-VII-1987, Zhou Zhihong leg.” ( CAU); 1♀ “ China, Guangxi, Xingan, Gaozhai, VII-2011 ” ( CAU); 1♂, “ China, Guizhou, Libo, Dongtang, 30-V-1988 ” ( CAU); 1♂, “ China, Guangxi, Huaping, Tianping Mountain, 9-VI-1963 ” ( CAU); 1♂, “ China, Guizhou, Libo, Maolan, 5-VI-2007, Li Hu leg.” ( CAU).

Distribution ( Fig. 31 ). China (Fujian, Guangxi, Guizhou, Sichuan).

Figures

FIGURE 1. Rihirbus sinicus Hsiao & Ren 1981, ♀, habitus. Scale bar of 1 = 6.06 mm.

FIGURE 2. Rihirbus sinicus Hsiao & Ren 1981, ♂, habitus. Scale bar of 2 = 5.27 mm.

FIGURES 3 – 13. Rihirbus sinicus Hsiao & Ren 1981. 3, 4, ♀; 5 - 13, ♂. 3, head, pronotum and scutellum, antennae removed; 4, fore leg; 5, 6, pygophore; 7, apical part of abdomen; 8, 9, paramere; 10, phallobase; 11 – 13, phallosoma. 6, 7, 13, ventral view; 3, 4, 5, 12, lateral view; 11, dorsal view. Scale bar of 3, 4, 7 = 2.74 mm; of 5, 6 = 1.04 mm; of 8, 9 = 0.42 mm; of 10 – 13 = 0.68 mm.

FIGURE 31. The geographical distribution map of species in genus Rihirbus. The green circle represents R. sinicus Hsiao & Ren and the red circle represents R. trochantericus Stål.

FIGURES 27 – 30. Rihirbus spp. 27, 28, R. trochantericus Stål 1861, ♀; 29, 30. R. sinicus Hsiao & Ren 1981, ♀. 27, 29, 30, photographed by Hu Li; 28, photographed by Ping Zhao.