Omphale longitarsus Li & Li, 2024

Omphale longitarsus Li & Li sp. nov.

Figs 1 D View Figure 1 , 5 A – K View Figure 5

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 View Figure 5 ) 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 View Figure 5 ) 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 View Figure 5 ) 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 View Figure 5 ) 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 View Figure 5 ) 5.5 × as long as wide, apex slightly pointed. All legs (Fig. 5 I – K View Figure 5 ) 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 View Figure 5 ) 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.