Euscopus robustus Stehlík, 2005

Zhao, Ping, Ou, Minmin, Cao, Liangming, Liu, Huaiyu & Wang, Jianyun, 2024, One new species and two new records of Pyrrhocoridae (Hemiptera, Heteroptera) from China, ZooKeys 1210, pp. 273-286 : 273-286

Euscopus robustus Stehlík, 2005

Figs 4 , 5 Chinese common name: 黑锐红蝽

Euscopus robustus Stehlík, 2005: 157.

Diagnosis.

The species is similar to Euscopus fuscus Hsiao, 1964 in body shape and coloration. However, the species reported here lacks the yellow to red posterior margin on the pronotum, and the body is nearly parallel-sided (in E. fuscus , the posterior margin of pronotum is yellowish brown, and the body is oblong-elliptical).

Redescription.

Coloration. Body dorsally black, ventrally reddish brown. Head, thorax, scutellum, and legs black; lateral margin of pronotum, costal margin of corium yellow to red; antennae black, basal half of fourth white (Fig. 4 ).

Structure. Body clothed with procumbent short setae. Posterior pronotal lobe, clavus, corium, rim of callus of anterior pronotal lobe, scutellum punctate. Body oblong, nearly parallel-sided (Fig. 4 ). Head subangular, compound eyes laterally produced, apical part of head forward and downward sloping; frons bulged; clypeus thickened and longer than paraclypei; first antennal segment longest, second sub-equal to fourth in length, third shortest; first to third labial segments nearly equal in length, fourth shortest, first and fourth thickened. Pronotum slightly gibbous, lateral pronotal margin moderately wide and reflexed; anterior pronotal lobe subequal to in length posterior lobe. Profemora ventrally in apical half with several minute denticles, middle part with a large spine. Third and fourth abdominal sternites with four round black spots, and two sides of each abdominal sternum with two black spots.

Male genitalia.

Pygophore gibbous, posterior margin concaved medially, posterior rim infolding and distinctly sloping into genital chamber, and forming an internal cuplike sclerite of pygophore, its apical margin straight (Fig. 5 a – c ); parameres short and thick, middle part with many oblique setae, apical part with a hook-shaped process (Fig. 5 d ); phallosoma shown in Fig. 5 e – g, a pair of dorsal conjunctival appendages long horn-shaped.

Measurements

[male (n = 1) / female (n = 1), in mm]. Body length 9.56 / 11.04; maximal width of abdomen 3.74 / 4.00. Head length 1.22 / 1.48; Head width 1.74 / 1.74; length of synthlipsis 0.87 / 0.96; length of antennal segments I – IV = 2.00 / 2.26, 1.22 / 1.30, 0.87 / 0.87, 1.30 / 1.30; length of labial segments I – IV = 0.78 / 0.78, 0.78 / 0.87, 0.70 / 0.87, 0.43 / 0.43; length of pronotum 1.74 / 2.26; width of pronotum 3.22 / 3.65; length of anterior pronotal lobe 0.70 / 0.70; length of posterior pronotal lobe 1.04 / 1.39; length of scutellum 1.30 / 1.22; length of hemelytron 6.96 / 8.00.

Material examined.

1 male, 1 female, China, Guangxi, Nonggang National Nature Reserve, Ningming , Huashan , Ping Zhao, Zhuo Chen & Yingqi Liu leg., 2022 - VII- 11, collected by using a light trap, deposited in CAU .

Distribution.

China [Guangxi (Nonggang)]; Laos. New record from China

Biology.

Euscopus robustus exhibits positive phototaxis when exposed to artificial light sources during nocturnal periods.

Figures

Figure 4. Euscopus robustus Stehlík, 2005, habitus a, b male c, d female a, c dorsal view b, d ventral view.

Figure 5. Euscopus robustus Stehlík, 2005, male external genitalia a – c pygophore d paramere e – g phallus a, e dorsal view b, f lateral view g ventral view c caudal view.