Omphale xanthosoma Li & Li 2024, sp. nov.

Omphale xanthosoma Li & Li sp. nov. Fig. 10 A – F Material examined. Holotype: • ♀ [NEFU; on card, right antenna and right wings on slide], China, Hainan Province, Ledong Li Autonomous County, Jianfengling National Forest Park, 18. V. 2021, leg. Ming-Rui Li and Gang Fu, by sweep netting. Diagnosis. Female. Body mainly yellow without metallic reflections, mesoscutum and mesoscutellum with a brown median stripe, posterior margin of abdominal tergites and apical part of ovipositor sheaths brown to dark brown; mid lobe of mesoscutum with only one pair of setae; gaster lanceolate, 2.0 × as long as length of mesosoma, obviously longer than head + mesosoma (1.6: 1.0); antenna with scape short, 4.0 × as long as wide; fore wing with ten admarginal setae, radial cell nearly bare, with a sparsely hairline from the middle part of radial cell. Description. Female. Body length 1.4 mm, mainly yellow without metallic reflections, with a brown longitudinal stripe along median part of mesoscutum and mesoscutellum, posterior margin of abdominal tergites and apical part of ovipositor sheaths dark brown; eyes dull red; antenna with scape yellowish white, except apical 1 / 3 of dorsal edge brown, pedicel pale brown to brown, flagellum dark brown; mandibles with teeth dark brown; all legs yellow to yellowish white, except brown tarsal claws; wings hyaline. Head (Fig. 10 A) in frontal view 1.3 × as wide as high, slightly collapsed after death; face and vertex smooth; POL: OOL ~ 1.5: 1.0; frontal sulcus arcuate, reaching eye margin, the midpoint closer to median ocellus than to antennal toruli; antennal scrobes join frontal sulcus separately; antennal toruli situated above level of lower eye margin; HE: MS: WM ~ 3.1: 1.0: 3.0; clypeus more or less semicircular, with upper margin weakly delimited and lower margin protruding, 2.2 × as wide as high; mandible with two large and pointed teeth at apex and one smaller and obtuse tooth at base. Antenna (Fig. 10 B) with all five flagellomeres separated from each other; scape 4.0 × as long as wide; pedicel 1.4 × as long as wide; F 1 1.0 × as long and 1.4 × as wide as F 2; F 3 to F 5 slightly decreasing in both length and width. Mesosoma (Fig. 10 C) 1.4 × as long as wide; pronotum reduced and not visible in dorsal view; mesoscutum with fine reticulation, mid lobe with only one pair of black setae; notauli indicated in anterior third; mesoscutellum 1.1 × as long as wide, anterior 1 / 2 with fine reticulation, posterior 1 / 2 smooth, with one pair of black setae located in the middle part; metascutellum small and triangular; propodeum short medially, 0.2 × as long as mesoscutellum, smooth, without median carina or plica. Fore wing (Fig. 10 D) 2.5 × as long as wide, speculum closed, with ten admarginal setae arising from both MV and from membrane just below MV, with apical setae attached close to STV; PMV longer than STV, radial cell nearly bare, with a sparsely hairline from the middle part of radial cell, ratio of SMV: MV: PMV: STV ~ 3.9: 5.3: 1.9: 1.0. Hind wing (Fig. 10 E) 5.3 × as long as wide, apex pointed. Legs (Fig. 10 F) with hind femur with three distinct long setae on outer side. Metasoma (Fig. 10 C) 3.4 × as long as wide; petiole short; Gaster lanceolate, 2.0 × as long as length of mesosoma, obviously longer than head + mesosoma (1.6: 1.0); ovipositor sheaths exserted beyond apex of gaster. Male. Unknown. Host. Unknown. Etymology. The specific name refers to the yellow body of this new species. Distribution. China (Hainan Province). Remarks. Omphale xanthosoma sp. nov. should belong to the obscurinotata group, and is similar to Omphale mellea Hansson. The two species share the following characteristics: body mostly yellow; antenna with scape mainly yellowish white to yellow, flagellum dark brown; mid lobe of mesoscutum with only one pair of setae; metascutellum small; propodeum short medially; fore wing with radial cell nearly bare, with a sparsely hairline from the middle part of radial cell; gaster elongate. Omphale xanthosoma sp. nov. differs from O. mellea in having a brown longitudinal stripe along the median part of the mesoscutum and mesoscutellum (vs only scutellum occasionally with a median infuscate stripe in O. mellea); fore wing hyaline, without any infuscate part (hyaline, infuscate close to STV in O. mellea); antenna with flagellum slender, F 2 and F 3 both nearly as long as F 1 (vs flagellum stouter, F 2 and F 3 both shorter than F 1 in O. mellea). Omphale xanthosoma sp. nov. also looks similar to O. melina but can be easily separated from it through the one pair setae on the midlobe of the mesoscutum and the narrow STV (midlobe of mesoscutum with two pairs setae and STV enlarged in O. melina). Omphale xanthosoma sp. nov. is also similar to O. ochra Hansson & Shevtsova, 2012 and O. rodopiensis Yefremova, Yegorenkova & Boyadzhiev, 2017. Habitually, it can be easily separated from the latter two species through the mostly yellow and non-metallic mesoscutum and the long PMV, which 1.9 × as long as STV (mesoscutum with at least anterior 1 / 2 golden green, PMV 0.7–0.9 × as long as STV in both O. ochra and O. rodopiensis, see Yefremova et al. (2017)).