Xanthopimpla omega, Pham & Broad & Matsumoto & Wägele, 2011

Pham, Nhi Thi, Broad, Gavin R., Matsumoto, Rikio & Wägele, Wolfgang J., 2011, 3056, Zootaxa 3056, pp. 1-67 : 28-29

Xanthopimpla omega sp. nov.

( Figs 1d, 3c, 5d, 7d, 9d, 11d, 13d)

Diagnosis. Median and lateral black marks on mesoscutum joined posteriorly to black mark in front of scutellum; area superomedia as long as wide; scutellum convex; metasomal tergites each with black spots, tergite 3 sparsely punctate, tergites 4 onwards with fine punctures.

Description (Holotype male). Body length 16.7 mm, fore wing 14.3 mm. Head. Antennal flagellum thinner apically, first flagellomere 1.55x length of second; diameter of lateral ocellus 1.55x ocellar-ocular distance; frons smooth; face 0.75x as high as wide, with low vertical curved carina beneath each antennal socket, dense, coarse punctures between carinae; clypeus 0.55x as high as wide, apical margin concave medially and laterally; malar space about 0.3x basal width of mandible.

Mesosoma . Epomia short; lower anterior corner of pronotum round, making obtuse angle of 100°; mesoscutum with sparse hairs; notaulus weakly present anteriorly, extending half distance to anterior level of tegula; scutellum strongly convex, pubescent, lateral carina extending to apex, forming lateral flange medially 0.35x as high as first flagellomere width; mesopleuron with sparse, minute punctures on upper half, dense, coarse punctures on lower half, epicnemial carina present on lower half of mesopleuron, postpectal carina medially forming low flange; metapleuron subpolished, submetapleural carina complete; pleural carina weaker before anterior margin; pleural part of propodeum divided by posterior transverse carina; propodeum with strong, complete carinae, area superomedia as long as wide, propodeal spiracle elongate, 4.8x as long as wide, in front of spiracle with tubercle swelling. Hind leg with femur 2.3x longer than wide, 0.8x length of tibia, basitarsus 0.3x length of tarsus, 1.8x second tarsomere, third tarsomere 2.15x as long as wide, mid tibia with three bristles at apex, one bristle near apex, hind tibia with three apical bristles. Fore wing with vein 2 rs-m 0.8x vein 3 rs-m; cu-a opposite Rs+M; hind wing with first abscissa of vein Cu 1 about 0.25x length of vein cu-a.

Metasoma. First tergite 1.25x as long as apical width, median longitudinal carina ending before oblique groove, dorsolateral carina complete; tergite 3 sparsely punctate; tergites 4 onwards with dense, fine punctures.

Colour. Lemon yellow; antenna blackish, scape and pedicel yellowish beneath; ocellar area and frons black; hind slope of vertex and occipital area largely black; mesoscutum with median and lateral black marks joined posteriorly to black mark in front of scutellum; tegula black posteriorly; propodeum with black spot in first lateral area; mid leg with basal 0.2 of tibia, basitarsus basally and fifth tarsomere blackish; hind trochanter with small black area, hind femur with small brown mark anteriorly and large black mark posteriorly, basal 0.2 of tibia, basitarsus basally and fifth tarsomere black; wing hyaline, margin infuscate, pterostigma and veins black, except basal 0.3 of costa yellowish; metasomal tergites 1–6 each with two black spots, tergite 7 with black band.

Female. Unknown

Comparison. The colour pattern of the new species is similar to X. nigripectus Townes & Chiu from New Guinea, but it differs from the latter by the colour pattern of the mesepisternum and metasomal tergites and differs from the shape of the scutellum and area superomedia.

Etymology. Named after the pattern of the mesoscutum, resembling the Greek lower case omega, ω; a noun in apposition.

Distribution. Currently known only in Ninh Binh Province, Cuc Phuong NP, North Vietnam (Fig. 19).

Ecological notes. The single specimen was collected in evergreen forest at an elevation of 200–300 m a.s.l.

Material examined. Holotype: 1♂ ( IEBR), Ninh Binh, Cuc Phuong NP, 200–300 m a.s.l, 26.iv.1998, R. Matsumoto leg.