Female: 1♀, Body length in lateral view 2 mm (Fig. 1A), length of antenna 3.1 mm (Fig. 1E), length of fore wing 2.5 mm (Fig. 1L).

Colour. Head entirely black (Fig. 1A and B). Mesosoma black, with the mesopleuron dark brown (Fig. 1F, G and H). Metasoma is black on the first tergite, becoming light brown from the second tergite onwards (Fig. 1I and K). Legs are generally yellowish, with the apices of the tarsi dark (Fig. 1J).

Head. Width of head 1.3 times as long as its height (Fig. 1B). Antennae consist of 31 antennomeres (Fig. 1E). Length of first flagellomere 3.1 times longer than width, length of the second 2.5 times longer than width and 0.9 times as long as the first flagellomere (Fig. 1D). First antennomere pale in comparison with third antennomere, while all flagellomeres remain dark brown (Fig. 1E). Width of the face 1.6 times as long as its height; face smooth with setose (Fig. 1B). In frontal view, gena rounded (Fig. 1B). The width of clypeus 2.2 times longer than its height (Fig. 1B). Mandible brown, becoming dark apically; widest at the base and gradually narrows towards apex (Fig. 1B). In dorsal view, length of eye 2.1 times longer than temple (Fig. 1C). Ocello-ocular line (OOL) 1.3 times as long as ocellar diameter (OD). The vertex smooth, shiny and sparsely setose (Fig. 1C).

Mesosoma. In lateral view, length of mesosoma 1.2 times as long as its height (Fig. 1F). The mesoscutum smooth and shiny, with the notauli distinctly impressed basally, but not extending to median area (Fig. 1H). Scutellar sulcus impressed, but lacks carinae. Scutellum smooth and shiny, bearing setae along its margins (Fig. 1G). In lateral view, mesopleuron smooth and polished. Metapleuron rugose and non-shiny, with setae present along its margins (Fig. 1F). Precoxal sulcus impressed only medially (Fig. 1F). Propodeum smooth and dull, becoming rugose near the margins; in its lower two-thirds, it curves inwards, forming a large, flattened tubercle.

Hind leg. Length of femur 4.4 times longer than its width (Fig. 1J). Length of tibia 8.3 times longer than width and 1.3 times as long as the femur. Length of basitarsus 3.5 times longer than wide. The coxa bears sparse setae, whereas the remaining leg segments are densely setae. Overall colouration is yellowish, with the apical parts of the tarsi darkened.

Wing. Length of fore wing 2.3 times longer than its width (Fig. 1L). Stigma wedge-shaped, with vein r arising from its anterior third. Proportions of vein r : 3-SR : SR1 = 1 : 15 : 31, while those of 2-SR : 3-SR : r-m = 2 : 4 : 1. Vein SR1 slightly curved dorsally at mid-length. Vein r-m is absent. Vein 1-M curved inwards at its apical three-quarters and vein 1-SR+M arises from the basal quarter of vein 1-M.

Metasoma. Length of first tergite 1.3 times as long as its maximum width, transversely rugose and bears a weak transverse carina medially; setae are sparsely present (Fig. 1I). Two spiracles situated dorsally. Ovipositor approximately one-quarter length of the metasoma (Fig. 1K). Hypopygium equal in length to the ovipositor and bears setae dorsally (Fig. 1K). Metasoma comprises about one-half of the total body length (Li et al. 2013).

Notauli present only anteriorly and not reaching the median depression; the median depression is absent (Fig. 1H). In frontal view, the gena is rounded. The clypeus is flattened and comparatively large, with the median portion slightly convex dorsally (Fig. 1B). The pronotum is short. The hind tarsus is yellowish-brown, except for the telotarsus (Fig. 1J).

China (Li et al. 2013), South Korea (in this study).

COI data of the original description from China and data from the present specimens (South Korea) exhibit a high degree of similarity, 99.85% of base pairs. Morphological comparison with the type material revealed differences in the head region. The most conspicuous differences occur in the relative proportions of the third and fourth antennal segments, the length of the temple and the proportions of the clypeus. Whereas the original description was based on a male specimen, the present study is based on a female, whose variation may account for the observed differences. More rigorous assessment requires re-examination of the type material and evaluation of intraspecific variation, based on a larger number of specimens. A description of the type specimen can be found in Li et al. (2013).

Male: 1♂, Body length in lateral view 2 mm (Fig. 2A). Length of antenna 2.4 mm (Fig. 2B). Length of fore wing 2.1 mm (Fig. 2K).

Colour: Body and mesosoma entirely black (Fig. 2A, F, G and I). Antenna yellowish-brown up to the second flagellomere, remaining to dark brown (Fig. 2C). Legs overall yellowish-brown; apical part of tarsi, including arolium and tarsal claws, dark brown (Fig. 2J).

Head. Width 1.3 times as long as height in frontal view (Fig. 2D). Antenna with 25 antennomeres (Fig. 2B); length of first flagellomere 3.0 times longer than wide, its length nearly equal to that of the second flagellomere (Fig. 2C). Third flagellomere darker in colour than preceding segments, with this darker shade extending to the apical antennomeres (Fig. 2B). Width of face 1.5 times as long as its height, smooth and shiny, sparsely punctate with setae; distinct median longitudinal carina (Fig. 2D). Gena straight in frontal view. Width of clypeus 1.8 times as long as its height, semicircular in shape. Mandible yellowish-brown basally, apically darkened; basally broadened in a distinct step-like manner (Fig. 2D). In dorsal view, length of eye 1.5 times as long as temple (Fig. 2E). OOL 3.4 times longer than OD (Fig. 2E). Vertex smooth and polished.

Mesosoma. In dorsal view, length of mesosoma 1.6 times as long as its width (Fig. 2F); in lateral view, length of mesosoma 1.2 times as long as its height (Fig. 2I). Mesoscutum smooth and polished. Notauli present, distinctly impressed basally, thereafter faintly traceable and ending as a small pit posteriorly (Fig. 2F). Scutellar sulcus with eight carinae (Fig. 2F). In lateral view, mesopleuron smooth and polished, with few setae along the margins. Metapleuron rugose, smoother medially compared to mesopleuron (Fig. 2I). Precoxal sulcus distinct, but not extending from the anterior margin (Fig. 2I). Propodeum rugose, not dorsally curved in lateral view, 2.1 times longer than wide at maximum length; ventral margin with a carina, curved inwards at one-third of its length (Fig. 2G and H).

Hind leg. Length of femur 4.6 times longer than its width; length of tibia 8.8 times longer than its width; length of basitarsus 3.4 times longer than its width (Fig. 2J). Hind coxa and femur with few or no setae; hind tibia and tarsus densely setose. Hind leg overall yellowish-brown, apical part of tarsus dark brown (Fig. 2J).

Wing. Fore wing. Length of fore wing 2.3 times longer than its maximum width (Fig. 2K). Stigma wedge-shaped. Vein r arising from anterior third of stigma; ratio of r : 3-SR : SR1 = 1 : 7 : 15; ratio of 2-SR : 3-SR : r-m = 3 : 6 : 2. Vein SR1 shallowly curved dorsally at mid-length. Vein r-m represented only by a trace. Vein 1-SR+M arising from basal quarter of vein 1-M. Vein m-cu postfurcal.

Metasoma. Length of first tergite 1.3 times as long as its maximum width, medially convex and finely rugulose; dorsal carinae arising from anterior quarter of tergite and curved outwards (Fig. 2H). Second tergite anteriorly rugose towards the mid-line, otherwise smooth (Fig. 2H). Length of metasoma 0.5 times as long as body length (Fig. 2A).

The temple is approximately two-thirds the length of the eye (Fig. 2E); the face bears a distinct median carina (Fig. 2D). The mandible is broadest at its base, broadened in a step-like manner; the gena is straight and narrowed (Fig. 2D). The notauli are distinct anteriorly, but vanish medially (Fig. 2F). The median depression is represented as a small puncture.

Germany (Fischer 1963), Netherlands (Li et al. 2013), South Korea (in this study).