Aulacocentrum assitum Long & Pham sp. nov.

Figs 1, 2, 16

Material.

Holotype, ♀, "Macr. 147 " (IEBR), NE Vietnam: Ha Giang, Vi Xuyen, Phong Quang, forest, 22°54'00"N, 104°54'56"E; 650 m a.s.l.; light trap, 26.v.2022, PT Nhi, PV Phu.

Description.

Holotype, female, body length 7.4 mm, fore wing length 6.2 mm, antenna 12.2 mm, ovipositor sheath 7.6 mm (Fig. 1).

Head. Antenna with 48 flagellomeres; flagellum densely setose; first flagellomere 1.4 × second one; length of first and second flagellomeres 7.5 and 5.5 × their widths, respectively; subapical antennomere 2.0 × its width; apical flagellomere with long spine; in frontal view, width of face 1.2 × its length (Fig. 2B); length of maxillary palp 2.2 × height of head; face shiny, punctate; malar space as long as basal width of mandible; clypeus convex, finely punctate (Fig. 2B); distance between tentorial pits 1.8 × distance from pit to eye margin; in lateral view, eye 3.5 × temple medially; head transverse, in dorsal view, head 2.1 × as wide as long; and width of head 0.6 × median length; temple short, eye 13.5 × as long as temple; ocelli large, OOL: OD: POL = 6: 8: 7 (Fig. 2A); frons, temple, and vertex coriaceous.

Mesosoma. Length of mesosoma 1.4 × its height (Fig. 2E); pronotal trough crenulate medially, mostly smooth dorsally, sparsely punctate ventrally; propleuron densely punctate (Fig. 2E); middle lobe of mesoscutum without impressions anteriorly; notauli narrow, mostly smooth anteriorly, punctate posteriorly; notauli fused posteriorly, separating by mid-longitudinal rugosity (Fig. 2D); median lobe of mesoscutum smooth, with sparse fine punctures; lateral lobes of mesoscutum mostly smooth, with sparse punctures near notauli; scutellum convex, with dense fine punctures; mesopleuron densely punctate (Fig. 2E); metapleuron rugose-punctate; propodeum foveolate-rugose (Fig. 2C).

Wings. Length of fore wing 2.9 × its maximum width (Fig. 2H); length of pterostigma 4.0 × its width; fore wing vein SR1 2.3 × as long as vein 3-SR; vein r originating behind middle of pterostigma, r: 3-SR: SR1 = 11: 25: 57; cu-a slightly inclivous (Fig. 2H), cu-a: 1-CU1: 2-CU1 = 9: 4: 33; 2-SR: 3-SR: r-m = 17: 25: 7; second submarginal cell of fore wing narrowed distally; hind wing vein cu-a: 1-M: 1r-m = 15: 12: 13; vein 2-SC+R vertical; vein SR strongly bent basally, at constriction mostly touching the frontal wing margin (Fig. 2I).

Legs. Hind coxa sparsely setose; length of femur, tibia, and basitarsus of hind leg 7.8, 17.8, and 14.0 × their maximum widths, respectively; left hind trochantellus with two teeth apically (Fig. 2G); tibial spurs straight, setose, length of hind inner and outer tibial spurs 0.4 × and 0.3 × hind basitarsus combined; length of hind basitarsus 0.4 × hind tibia and 1.1 × second-fifth tarsal segments.

Metasoma. Length of metasoma 1.5 × head and mesosoma combined; first tergite parallel-sided, flat medio-basally, length 5.1 × its apical width; mostly smooth anterior of spiracle, transversely rugose from spiracle to apex; median length of second tergite 1.2 × third tergite; second tergite narrowed medio-laterally (Fig. 2F), with fine convergent striae; third tergite with fine parallel striae basally; finely punctate apically; fourth-sixth metasomal tergites punctate, densely setose (Fig. 2F); length of ovipositor sheath 1.2 × fore wing.

Colour. Head black; scapus dark brown, cream-white ventrally; pedicel yellow; flagellum brown with flagellomeres 9th-18th ivory; mandible yellow; palpi whitish yellow; propleuron brown; middle lobe of mesoscutum and scutellum yellowish brown; lateral lobes of mesoscutum, mesopleuron, metapleuron, and propodeum reddish yellow; fore and middle legs yellow; hind coxa yellow basally, brown apically; hind trochanter and trochantellus infuscate; hind femur dark brown; hind tibia mostly brown, pale yellow basally, cream-white apically; hind tibial and tarsus cream-white; tegula brownish yellow; wing membrane hyaline; veins yellowish brown, except vein 1-R1 and parastigma whitish yellow; pterostigma brown, pale yellow apically; metasoma brown, except first tergite basally, second and third metasomal tergites laterally and ventrally pale yellow; ovipositor sheath brown; ovipositor yellow.

Male. Unknown.

Biology.

Unknown.

Etymology.

From assitus (Latin for “near”), because this new species is close to A. seticella van Achterberg & He, 1994, from China.

Distribution.

NE Vietnam (Ha Giang province) (Fig. 16).

Notes.

This new species is close to A. seticella van Achterberg & He, but differs from the latter by the following characters: 1) length of maxillary palp 2.2 × height of head (1.6-1.7 × in A. seticella); 2) marginal cell of hind wing as wide basally as apically (Fig. 2I) (strongly widened basally in A. seticella, see He and van Achterberg 1994: fig. 18); and 3) second metasomal suture distinct, basal 1/3 of third tergite finely striate (second suture indistinct, more than basal 1/2 of third tergite finely striate in A. seticella).