Stenarella nigriscuta, Santos & Bordera, 2025

3.1.13. Stenarella nigriscuta sp. nov.

Figures 1 K View Figure 1 , 16 View Figure 16 , 24E View Figure 24 , 28 View Figure 28

Etymology.

From the Latin adjective niger, - gra, - grum, meaning “ black ”, and the noun scutum, - i, in reference to the entirely black mesoscutum in this species.

Diagnosis.

Stenarella nigriscuta sp. nov. can be distinguished from all other Stenarella species by the combination of the following characters: pronotum and mesoscutum mostly smooth (Fig. 16 D, E View Figure 16 ); posterior area of propodeum transversely striate, striae regularly separated and reaching pleural sulcus (Fig. 1 K View Figure 1 ); face black (Fig. 16 B View Figure 16 ); antenna with white band on f 6 – f 13 (Fig. 16 A View Figure 16 ); mesoscutum dark brown to black (Fig. 16 E View Figure 16 ); mesopleuron, metapleuron and propodeum light orange to orange (Figs 1 K View Figure 1 , 16 A, D View Figure 16 ); hind coxa orange (Fig. 16 A View Figure 16 ); wing hyaline or evenly infuscate (Fig. 16 A View Figure 16 ).

Description.

FEMALE. Fore wing 11.3–12.3 mm long. — Head (Fig. 16 A, B, D, E View Figure 16 ): Mandible covered with very dense and long setae, clypeus and face moderately setose. Mandible punctate, MLW 2.1–2.55. Malar space short, MSM 0.35–0.45. Clypeus smooth, CWL 2.5–2.65. Clypeus and face mostly flat. Face centrally distinctly rugulose, or rugulose granulate, elsewhere smooth. Frons smooth and shiny, with weak interrupted longitudinal carina. Antenna with 34 flagellomeres. — Mesosoma (Figs 1 K View Figure 1 , 16 A, C – E View Figure 16 ): Pronotum almost entirely smooth and shiny. Epomia strong, reaching pronotal depression. Mesoscutum almost entirely smooth and shiny. Notaulus reaching 0.55–0.75 of mesoscutum with fine transverse striae. Scutellum mostly smooth, with shallow lateral punctures. Mesopleuron and metapleuron moderately setose. Mesopleuron mostly moderately punctate, dorsally weakly longitudinally striate, slightly rugulose punctate along epicnemial carina. Epicnemial carina distinct, reaching 0.7 of distance to subtegular ridge. Sternaulus shallow and sinuous, reaching posterior rim of mesopleuron. Metapleuron densely punctate reticulate. Propodeum relatively long, dorsal profile in lateral view evenly convex and sloped. Anterior area of propodeum rugose punctate sometimes medially weakly transversely strigose. Propodeal spiracle elliptic, SLW 2.35–2.6. Posterior area of propodeum covered by fine, more or less uniformly spaced transverse striae. Posterior transverse carina of propodeum indiscernible from transverse striae. Areolet small, closed distally by an unpigmented vein 3 rs-m, APH 0.35–0.45. Vein 2 m-cu antefurcal to vein 3 rs-m. Hind wing vein Cua distinctly longer than crossvein cu-a, HW 1 C 2.0–3.0. — Metasoma (Fig. 16 A, F View Figure 16 ): Posterior end of S 1 placed posteriorly to spiracle of T 1. T 1 LW 3.0–3.55; T 1 WW 1.85–2.0; T 2 LW 1.25–1.45; T 2 WW 2.25–2.4. Thyridium 2.0–2.5 times as long as wide. T 2 mostly minutely punctate reticulate on a finely granulate background, anterior part finely granulate. Dorsal valve of ovipositor with 6 teeth. Ventral valve with 9–11 teeth. OST 3.75–4.45. — Color (Figs 1 K View Figure 1 , 16 View Figure 16 ): Head mostly black: labrum, clypeus, mandible except distal part, mouth parts, usually spot on malar space, facial and frontal orbits, dorsal part of genal orbit and f 6–13 dorsally, whitish. Mesosoma mostly light orange to orange: mesoscutum black; propleuron, pronotum mostly, spot on medial anterior part of propodeum, dark brown; dorsal lateral part of pronotum, subtegular ridge, lateral parts of scutellum and usually posterior medial spot on propodeum, whitish. Fore and mid leg orange, sometimes fore coxa and trochanter whitish. Hind leg mostly dark brown; coxa, and sometimes ventral part of femur orange; t 1 posteriorly, t 2 – t 4, and distal part of t 5, whitish. Wing hyaline. Metasoma dark brown; T 1 – T 2 narrowly and T 6 – T 7 extensively posteriorly whitish. — MALE. Unknown.

Hosts.

Unknown.

Distribution.

Afrotropical. Known records from Cameroon, Nigeria and Republic of the Congo (Fig. 24 E View Figure 24 ).

Material examined.

6 ♀♀. Holotype. CAMEROON • ♀; Nkoemvom ; 13.VII–24.VIII.1980; Ms. D. Jackson ( NHMUK) . Dry pinned. Distal flagellomeres from f 29 of right antenna missing. — Paratypes. CAMEROON • 2 ♀♀; same data as holotype ( NHMUK) • 1 ♀; same data except 25.IX–19.XI.1979 ( NHMUK) . NIGERIA • 1 ♀; Oni River; 70 miles. E of Lagos ; 15.V.1910; W. A. Lamborn / 1911–422 ( NHMUK) . REUBLIC OF THE CONGO • 1 ♀; Brazzaville, Djoumouna ; 22.X.1968; M. Grjebin Coll. ( MNHN) .