Orientalicesa nigra, Li & Barthélémy & Carpenter, 2019

Li, Ting-Jing, Barthelemy, Christophe & Carpenter, James M., 2019, The Eumeninae (Hymenoptera, Vespidae) of Hong Kong (China), with description of two new species, two new synonymies and a key to the known taxa, Journal of Hymenoptera Research 72, pp. 127-176 : 127

(26) * Orientalicesa nigra sp. nov.

Figs 86-91

Material examined.

CHINA: Hong Kong , HOLOTYPE, ♀, Park Sha O, hand net, 15-27.iv.2008, UTM: 50Q KK 242 849, 70m, 0554. C.Hy. 1, leg. C. Barthélémy [AMNH].

Description.

Female (Figs 86-91 ): body length 9.0 mm; fore wing length 10.5 mm. Black, with the following parts yellow: two small interantennal spots ( Fig. 88 ), scape ventrally, a small spot on base of mandible, and a small band of fore tibia inside; antenna except scape, mandible except a spot, all legs except the band of fore tibia, tegula, and apex of parategula dark ferruginous. Wings brown, infuscate, veins dark brown.

Head. Clypeus ( Fig. 88 ) 1.02 × as wide as long, medially convex, coarsely punctuate, interspaces between punctures more or less reticulate; apex slightly emarginated medially and forming blunt tooth on each lateral side, total width 3.29 × apical width, apical width 7 × emargination depth and as wide as interantennal space; interantennal carina prominent; frons slightly convex and coarsely punctate, distinctly carinate and reticulate between punctures; vertex ( Fig. 89 ) with two large cephalic foveae, brown pubescence inserted mesally, depression for cephalic foveae distinctly concave, and with a medio-longitudinal carina from anterior ocellus to occipital carina and connecting occipital carina, punctures on other parts of vertex and gena relatively sparser; occipital carina complete.

Mesosoma. Mesosoma not visibly depressed; pronotal carina complete and strong, anterior sloping face of pronotum obviously polished; pronotum, mesoscutum, mesepisternum, scutellum, and metanotum coarsely and deeply punctate, interspaces between punctures with distinct carinae and reticulate, epicnemial carina present, not strong; mesoscutum weakly convex, scutellum flat, in lateral view at same level as mesoscutum, strongly depressed along anterior margin with some short longitudinal carinae, and without a medial longitudinal furrow from middle to apex; metanotum sloping down to apical margin; propodeum ( Fig. 90 ) without horizontal area behind midline of metanotum, dorsal face of propodeum coarsely punctate, punctures large, shallow, flat bottomed and interspaces with reticulate carinate, superior carinae ( Fig. 90 ) of propodeum well developed and on top forming a pair of large triangular teeth behind metanotum, carinae curved, posterior surface distinctly concave, with few faint striae, and bordered by superior carina with wide V-shaped incision in middle above; tegula shorter than parategula posteriorly.

Metasoma. T1 wider than long, width 1.63 × its length and 0.83 × width of T2, vertical anterior faces distinctly coriaceous and separated from horizontal surface, horizontal surface without transverse carina and moderately punctate, punctures much sparer and smaller than those of head and mesosoma, apex with a wide, smooth and shiny preapical band ( Fig. 91 ); T2 1.29 × as wide as long, with a row of larger and denser punctures at about 1/5 of their length from apical margin and forming a broad smooth and shiny preapical band ( Fig. 91 ) and with another row of sparse punctures close to the apical edge, other punctures of T2 slightly sparser than those of T1, subapex of T2 not swollen; S2 sparsely punctate and regularly convex; visible apexes of T3-T5 with the similar preapical bands to that of T2; lateral margins of T2-T4 clearly marginalized.

Male. Unknown.

Distribution.

*China (*Hong Kong).

Remarks.

This species is similar to O. bicolorata (Giordani Soika, 1994) from Indonesia in superior carinae of propodeum well developed and forming a pair of large triangular teeth behind metanotum, punctures of T2 moderately dense and not larger than those of mesoscutum, and apex of T2 with another row of sparse punctures close to the apical edge. It can be distinguished from the related species and all other members of the genus by the combination of following characters: mesosoma not visibly depressed, and the body ( Figs 86-87 ) almost wholly black and without yellowish or reddish-ferruginous spots or bands.

Etymology.

The specific name refers to the body almost wholly black.

Figures

Figures 86 - 97. Orientalicesa nigra sp. nov., female 86 habitus (lateral view) 87 habitus (dorsal view) 88 head (frontal view) 88 face (frontal view) 89 dorsal view of vertex 90 propodeum (dorsal view) 91 metasoma (dorsal view) 92 - 94 Paraleptomenes kosempoensis, female 92 habitus (lateral view) 93 habitus (dorsal view) 94 head (frontal view) 95 - 97 Parancistrocerus hongkongensis, female 95 habitus (lateral view) 96 habitus (dorsal view) 97 head (frontal view).