Aulacocentrum glabrum Long sp. nov.

Figs 3, 4, 16

Material.

Holotype, ♀, "Macr. 050 " (IEBR), S Vietnam: Dong Nai, Vinh Cuu, Phu Ly, forest, 11°22'52.3 ”’ N, 107°03'43.6"E; 107 m a.s.l., light trap, 03.viii.2008, HV Tru.

Description.

Holotype, female, body length 12.0 mm, fore wing length 9.4 mm, antenna 17.6 mm, ovipositor sheath 13.4 mm (Fig. 3).

Head. Antenna with 51 flagellomeres; first flagellomere 1.3 × second one; length of first and second flagellomeres 3.8 and 4.4 × their widths, respectively; length of subapical antennomere 2.7 × its width; in frontal view, width of face 0.8 × its length (Fig. 4B); length of maxillary palp 2.0 × height of head; face densely punctate medially, sparsely punctate laterally (Fig. 4B); malar space 0.9 × as long as basal width of mandible; clypeus slightly convex ventrally, sparsely finely punctate (Fig. 4B); distance between tentorial pits 1.3 × distance from pit to eye margin; in dorsal view, width of head 2.2 × median length; temple short, smooth, eye 15.5 × temple; ocelli large, OOL: OD: POL = 6: 9: 9 (Fig. 4A); frons smooth.

Mesosoma. Length of mesosoma 1.4 × its height (Fig. 4E); pronotal trough finely and densely crenulate medially, shiny smooth dorsally, finely punctate ventrally; propleuron densely punctate (Fig. 4E); middle and lateral lobes of mesoscutum mostly coriaceous, with sparse fine punctures; notauli crenulate anteriorly, strongly converging posteriorly in a sharp V-shaped depression, divided by mid-longitudinal rugosity (Fig. 4D); scutellar sulcus wide, with one median carina, 0.5 × as long as scutellum; scutellum convex, rugose-punctate; mesopleuron densely punctate (Fig. 4E); metapleuron rugulose; propodeum reticulate-rugulose (Fig. 4C).

Wings. Length of fore wing 5.2 × its maximum width; length of pterostigma 5.2 × its width; fore wing vein SR1 2.2 × as long as vein 3-SR; r: 3-SR: SR1 = 12: 37: 80; vein 1-CU1 quadrate; cu-a: 2-CU1 = 11: 52; 2-SR: 3-SR: r-m = 21: 37: 10; second submarginal cell of fore wing narrowed distally; hind wing vein 2-SC+R thick, nearly quadrate; vein 1-M weakly curved basally; hind wing vein cu-a: 1-M: 1r-m = 22: 22: 16; vein SR strongly bent basally (Fig. 4F), and marginal cell largely glabrous basally, wider medially than basally and apically, parallel-sided medially and distinctly widened apically (Fig. 4F).

Legs. Hind coxa densely setose latero-ventrally, but without setae dorso-apically; length of femur, tibia, and basitarsus of hind leg 9.1, 17.0, and 12.3 × their maximum widths, respectively; left hind trochantellus with four teeth apically (Fig. 4H); length of hind inner and outer tibial spurs 0.4 × and 0.3 × hind basitarsus, respectively; length of hind basitarsus 0.4 × hind tibia and as long as second-fifth tarsal segments combined.

Metasoma. Length of metasoma 1.6 × head and mesosoma combined; first tergite deeply concave medio-basally (Fig. 4G), length of first tergite 3.6 × its apical width; median length of second tergite 1.1 × third tergite; first metasomal tergite transversely striate basally, transverse-obliquely striate medio-subapically, obliquely striate at apex; second tergite with convergent striae on most part of tergite, but with parallel striae apically (Fig. 4G); third tergite with fine striae, mostly smooth apically; remaining metasomal tergites sparsely punctate, with sparse long setae; length of ovipositor sheath 1.4 × fore wing.

Colour. Head dark brown; palpi yellow; scapus and pedicellus dark brown; flagellum brown with flagellomeres 8th-18th yellow; mesosoma brown; wing veins yellowish brown; tegula yellow; parastigma, pterostigma basally and apically yellow; wing membrane hyaline; fore and middle legs yellow; hind coxa (except apically brown), trochanter and trochantellus yellow; hind tibia brown, except yellow at base; hind tarsus and tibial spurs yellow; metasoma blackish brown, except basal 1/2 of first and third tergites pale yellow; ovipositor sheath brown; ovipositor yellow.

Male. Unknown.

Biology.

Unknown.

Etymology.

From glaber (Latin for hairless), referring to the hind wing with both the basal cell apically and the marginal cell basally glabrous.

Distribution.

S Vietnam (Dong Nai province) (Fig. 16).

Notes.

This new species can be distinguished from other species by the following characters: marginal cell of hind wing largely glabrous basally, and vein 1-CU1 of fore wing quadrate.