Sirthenea (Sirthenea) nigra Cai & Tomokuni 2004

Sirthenea (Sirthenea) nigra Cai & Tomokuni, 2004

(Figs. 113–121, 179, 206, Map 11)

Sirthenea nigra Cai & Tomokuni, 2004: 89. Holotype (♂): Pha Din Pass: Vietnam; NSMT.

Sirthenea nigra: Chłond (2008a: 385).

Sirthenea nigra: Chłond (2008b: 139).

Type material examined: Holotype, Ƌ: 4.V.95 [handwritten by pencil], 71[in the circle, handwritten by pencil] / Pha Din Pass. / 1400m L.T. [handwritten by pencil] (NSMT).

Other material examined: Laos: 4 ƋƋ: Lao–NE, Hua Phan prov., / ~ 20°12'N 104°01'E, / Phu Phan Mt., 1500– / 1900m, 17.v.–3.vi.2007, Vit. Kubáň leg. [printed]; Entomological expedition / „Laos 2007” / Moravian Museum Brno / Czech Republic [printed] (MMBC). Malaysia: 2 ƋƋ: Malaysia W., Pajiang / 50 km NE of Kuala Rompin / Endau Rompin Nat.P., 400m / G.Keriung. (Kg. Tebu Hitam) / 9.–30.iv.2008, P.Cechovsky lgt. [printed]; Sammlung–Collection / Ernst Heiss / Innsbruck—Austria [printed] (TLMF).

Diagnosis. This species is similar to S. caiana and S. nitida but can be easily distinguished from those two species by the not enlarged basal part of second visible labial segment, the U-shaped posterior margin of an eye in lateral view, the bulbous median process of the pygophore and dark coloration of the body (black or dark brown) with paler middle part of connexives.

MAP 11. Distribution of Sirthenea nigra Cai & Tomokuni, 2004.

Redescription: Color: Body black to dark brown (Figs. 113, 206). Basi- and distiflagellum dark brown to yellowish. Second and third visible segments slightly paler. Posterior pronotal lobe slightly paler than anterior lobe. Hemelytron with barely visible paler markings (dark yellowish) in basal part. Coxa dark or with paler apical part. Fore femur pale with dark base, apex and longitudinal lines on ventral and dorsal surfaces. Middle and hind femur dark with pale base and apex. Middle and hind tibia dark with pale base. Tarsus brownish. Connexives grayish with dark margins. Abdomen beneath brown (except dark sternite of II abdominal segment), distinctly paler than thorax. Pygophore with paler parameres.

Structure: Body medium-sized, slender with shinning head, pronotum, scutellum and costal margin. Head, scape, pronotum, scutellum, meso- and metathoracic sterna, legs and abdomen beneath with long setae. Dorsal surface of antenniferes corrugated. Pedicel and distiflagellum with rather short, dense setae. Scape, club-shaped with 4 trichobothrial setae (Fig. 179). Corium with short setae. Eyes and ocelli large, eyes narrower than synthlipsis. Posterior margin of an eye U-shaped. Anteocu1ar part of head about 2.83–3.39 times as long as postocular part. Apodeme depression of head shallow, transversal furrow deep. Ridges proepisternum and proepimeron not connected in entire length. Pedicel, basi- and distiflagellum subequal in length. Second visible labial segment, not enlarged basally, surpassing posterior margin of eyes. Anterior pronotal lobe with distinct collar, sculptured with median and lateral longitudinal sulci. Sulci granulated and dull. Anterior pronotal lobe with short, wide and deep apodeme depression. Posterior pronotal lobe sculptured, with distinct depression in middle of anterior margin. Metapleura with two complete ridges. Scutellum with long setae, and distinctly enlarged lateral margins. Hemelytron with distinct sculpturation on costal margin, surpassing apex of abdomen. Abdomen with spiracles III–IV placed close to ventral connexival suture. Lateral parts abdominal sternites with distinct sculpturation.

Genitalia: Median process of pygophore bulbous, delicately bent, apex rounded (Fig. 114). Paramere broad, triangular (Figs. 115–118). Right paramere slightly longer and narrower than left paramere (Figs. 117, 118), apex of inner side of right paramere with a small sharp process (Fig. 118), apex of inner side of left paramere with a tubercular process (Fig. 116). Basal plate of aedeagus robust and slightly longer than basal plate bridge (Fig. 121), pedicel bent (Figs. 119–121). Pedicel relatively robust and bent laterally (Figs. 119, 120); dorsal phallothecal sclerite strongly enlarged on right side (Fig. 121); apical portion of right side of phallotheca wrinkled (Fig. 121), endosomal processes visible on left side of aedeagus in resting position.

Measurements (in mm): Body length:17.4–17.5; maximum width of abdomen: 4.2–4.4; head length: 3.0; head width: 1.7–1.8; length of anteocular part: 1.6–1.7; length of postocular part: 0.5–0.6; length of synthlipsis: 0.6–0.7; interocellar distance: 0.4–0.5; lengths of antennal segments I:II:III:IV: 0.9–1.0: 2.0–2.1: 1.6–1.7: 2.0–2.1; length of visible labial segments I:II:III: 0.8–0.9: 2.0–2.2: 0.8–1.1; maximum length of anterior pronotal lobe: 2.2–2.4; maximum length of posterior pronotal lobe: 1.3–1.6; maximum width of anterior pronotal lobe: 2.5–2.8; maximum width of posterior pronotal lobe: 3.6–3.7; length of scutellum: 1.5–1.6; length of hemelytron: 11.3–11.9.

Female: Unknown.

Distribution: Laos, Malaysia, Vietnam (Map 11).