Xenocaucus rubeho, Weirauch & Forthman & Grebennikov & Baňař, 2017

Weirauch, C., Forthman, M., Grebennikov, V. & Baňař, P., 2017, From Eastern Arc Mountains to extreme sexual dimorphism: systematics of the enigmatic assassin bug genus Xenocaucus (Hemiptera: Reduviidae: Tribelocephalinae), Organisms Diversity & Evolution (New York, N. Y.) 17 (2), pp. 421-445 : 440

Xenocaucus rubeho , n. sp.

Figures 4 , 5 , 6 , 7 , and 10.

Diagnosis Female: recognized by the relatively large body size (∼ 3.4 mm), the slight raised and transversally elongate pronotal disk ( Fig. 4 ), the pronotum about as long as the mesonotum (ratio 0.9), the intersegmental membrane between tergites 3 and 4 slightly curved caudad ( Fig. 4 ), and setae dorsally on the dorsal laterotergites long ( Fig. 4 ).

Description Female: 2total length 3.37 mm, total length: greatest abdominal width 1.9; wing condition and general vestiture as in generic description. Coloration: uniformly yellowish brown to reddish brown. Structure: head: about as long as wide in dorsal view, with very small anteocular area, glabrous area on vertex indistinct, longitudinal sulcus or pit indistinct, tuft distinct, lateral fringes longer laterally than around posterior half of head. Antenna: scape length: head length 0.7, moderately slender. Labium: first visible segment: head length 0.8. Thorax: transverse suture between pronotum and mesonotum distinct, pronotal disk slightly raised and transversally elongate, pronotum about as long as mesonotum (ratio 0.9), greatest pronotal width: pronotal length 1.4. Legs: foretrochanter without ventral process, forefemur length: body length 0.3, forefemur fairly slender. Abdomen: slightly longer than wide, length: width 1.2, intersegmental membrane between tergites 3 and 4 slightly curved caudad, intersegmental membrane between tergites 6 and 7 distinctly curved anteriad, intersegmental membrane between tergites 7 and 8 slightly curved, mediotergites 1/2 and 3 glabrous, setae on lateral margin of dorsal laterotergites long, setae dorsally on dorsal laterotergites long. Genitalia: as in generic description.

Male: unknown.

Etymology: named for the holotype locality of the holotype, Rubeho Mts. in Tanzania.

Material examined: holotype: Tanzania Rubeho Mts. at Ipondelo Vil., 6.83056° S, 36.56889° E, 1993 m, 20 Dec. 2011, V. Grebennikov, 1;female (00020650) ( CNC) .

Figures

Fig. 4 Dorsal habitus of X. rubeho, n. sp., (female), the female holotype as well as one female and one unsexed immature (both from Uluguru) of X. schoutedeni, X. uluguru, n. sp., (female), and one immature (unsexed)

Fig. 5 Lateral habitus of females of the seven East African species of Xenocaucus and the male of X. ethiopiensis. fl flagellomeres, lb1–3 first, second, and third visible labia segments, om ommatidium, pd pedicel; scale bars, 1 mm

Fig. 6 Ventral habitus of the seven East African species of Xenocaucus and the male of X. ethiopiensis; abbreviation: vptr, ventral process on trochanter

Fig. 7 Details of the head (dorsal, lateral, and/or ventral view) of selected species of Xenocaucus