Description:
Female: Head, frons, and cheeks with reticulate sculpture. Head with golden-brown or silvery-white hairs, fine and dense. The area above the clypeus is smooth. Head width is greater than the mesosoma width, with a length to width ratio of 6:13.5. Antenna with 12 segments, scape 5 times longer than wide; antennal segment 2 only 0.25 times the length of the scape, 2 times longer than wide. Antennal segment 3 longer than segment 2, 1.77 times longer than wide. Antennal segment 4 is 0.39 times the length of antennal segment 3 and wider than long (length 0.6 times width). Segment 5 with a length of 0.45 times the width. The remaining segments form the club. Length of the first club segment is 0.37 times its width, segment 2 is 1.66 times longer than the first club segment, with a length of 0.53 times its width; segment 3 is clearly shorter than segment 2, with a length of 0.78 times its width. Club segment 4 is 0.85 times the length of segment 3, with a length of 0.44 times its width. Segment 5 is almost as long as segment 4, with a length of 0.52 times its width. Segment 6 is nearly as long as segment 3, it has a length of 0.65 times its width. The terminal segment is egg-shaped, 1.5 times longer than the penultimate segment and 1.3 times longer than wide.
Mesoscutum and scutellum with reticulate sculpture (wider on the mesoscutum than on the head). Neck with a few long transverse furrows, propleuron with reticulate sculpture, mesopleuron with fine furrows interspersed with reticulate sculpture. Metapleuron with mesh-like furrows. Propodeum wrinkled and short, with a groove from the coxae to the base of the wing. Thorax with silvery-white, dense hairs. Forewing longer than wide (145:8), marginal vein short, stigmal vein noticeably longer than the marginal vein.
Metasoma width is equal to the mesosoma width. Metasomal tergite 2 wider than long. Tergite 1 with long, thick furrows, other tergites with fine and regular furrows. Tergite 1 longer than wide, with a few long, white hairs on both sides of its base. Length of the metasoma is clearly longer than the combined length of the head and mesosoma.
Body black. Compound eyes, ocelli, and mandibles dark brown. Antennae black, except for the brown scape. Legs brown, except for the dark brown coxae. Forewing dark brown except for the basal 1/3 which is pale. Wing veins brown except for the base of the submarginal and stigmal which are very dark brown.
Male is similar in shape and color to the female. Vertex with golden hairs. Antenna with 10 segments, filiform. Scape 3 times longer than wide. Antennal segment 2 is 1/3 the length of the scape, 1.2 times longer than wide. Antennal segment 3 is longer than segment 2 and subsequent segments. Antennal segment 4 is shorter than wide.
Measurements:
Body length 3.72 – 4.22 mm.
Distribution:
Vietnam: Son La, Thai Nguyen, Hanoi.
Outside Vietnam: India.
Type Material:
3 females and 1 male, Son La, 5/1986 (A. Sarkov and V. Triapitxun), 23 females and 1 male, Thai Nguyen, 4/1986 (A. Sarkov and V. Triapitxun), 9 females and 1 male, Hanoi, 4/1986 (A. Sarkov and V. Triapitxun).