Omphale longitarsus Li & Li 2024, sp. nov.

Omphale longitarsus Li & Li sp. nov. Figs 1 D, 5 A – K Type material. Holotype: • ♀ [NEFU; on card], China, Xizang Autonomous Region, Medog County, Damu Village, 22–29. VI. 2017, leg. Zhaxi, by Malaise trapping. Paratypes: • 2 ♀: 1 ♀ [NEFU; on slide], same data as the holotype • 1 ♀ [NEFU; on card], China, Xizang Autonomous Region, Medog County, Gedang Village, 31. V – 5. VI. 2021, leg. Jun-Jie Fan and Jun Wu, by yellow-pan trapping. Diagnosis. Female. Frontal sulcus slightly curved, nearly straight, reaching eye margin; clypeus quadrangular with lower margin arcuately protruding, 1.9–2.0 × as wide as high; antenna slender, flagellomeres decreasing in width from F 1 to F 5; propodeum smooth and flat, with a narrow groove along anterior margin, without median carina; all legs with apical tarsomere slander and elongate, nearly as long as half the length of whole tarsus. Description. Female. Body length 1.4–1.5 mm. Face and vertex bronze with golden-green reflections, eyes red, clypeus with same color as surrounding parts of face, mandibles yellowish white with base and apex brown. Mesosoma brown with weak golden-blue or golden-green reflections. Metasoma brown to dark brown, except yellow petiole. Antenna with scape yellowish white, pedicel and flagellum brown, gradually lighten towards apex, F 5 yellowish white. All legs yellowish white except brown claws and fore coxae. Fore wings hyaline. Head (Fig. 5 A, B) in frontal view 1.3 × as wide as high. Face between frontal sulcus and frontal cross-ridge with weak and irregular sculpture, remainder of face and vertex smooth; POL: OOL ~ 1.8: 1.0; frontal sulcus slightly curved, nearly straight, reaching eye margin, the midpoint closer to antennal torulus than median ocellus; antennal scrobes join frontal sulcus separately; subtorular grooves and frontal cross-ridge present; clypeus quadrangular with lower margin arcuately protruding, 1.9–2.0 × as wide as high; mandible with two large teeth at apex and a row of smaller teeth at base; HE: MS: WM ~ 2.8: 1.0: 1.2. Antenna (Fig. 5 C) slender, with all five flagellomeres separated from each other; scape 6.5 × as long as wide; pedicel 2.4 × as long as wide, and 0.6 × as long as F 1; flagellomeres decreasing in width from F 1 to F 5, F 1 0.9 × as long and 1.5 × as wide as F 2. Mesosoma (Fig. 5 D, E) 1.5 × as long as wide; pronotum reduced and not visible in dorsal view; mesoscutum smooth and flat, with two pairs of setae; notauli indicated only in anterior third; mesoscutellum flat, with very weak traces of reticulation, 1.4 × as long as wide, with one pair of setae located in the middle and close to lateral margin; axillae smooth; metascutellum smooth, nearly triangular, 0.4 × as long as wide, and 0.5 × as long as length of median propodeum. Lateral panels of metanotum smooth; propodeum smooth and flat, with a narrow groove along anterior margin, without median carina. Fore wing (Fig. 5 F) 2.6 × as long as wide, with rather dense setae on membrane, speculum closed; with nine admarginal setae arising from MV; PMV shorter than STV, radial cell setose, ratio of SMV: MV: PMV: STV ~ 4.3: 7.8: 1.0: 1.8. Hind wing (Fig. 5 G) 5.5 × as long as wide, apex slightly pointed. All legs (Fig. 5 I – K) with apical tarsomere slander and elongate, nearly half the length of whole tarsus; metatibial spur distinctly shorter than basal tarsomere, only reaching the middle of basal tarsomere. Metasoma (Fig. 5 H) 2.2 × as long as wide; petiole short; gaster 1.6 × as long as the length of mesosoma, and longer than head + mesosoma (1.2: 1.0); ovipositor sheaths exserted beyond apex of gaster. Male. Unknown. Host. Unknown. Etymology. The specific name refers to the elongate tarsus. Distribution. China (Xizang Autonomous Region). Remarks. Omphale longitarsus sp. nov. should belong to Aetius group, and can be separated from other species by having antenna slender, flagellomeres decreasing in width distinctly from F 1 to F 5, F 1 0.9 × as long and 1.5 × as wide as F 2; all legs with apical tarsomere slander and elongate, nearly half the length of whole tarsus.