Leptozele radiellanus (He & Chen, 2000) comb. nov.

(Figures 5, 6)

Macrocentrus radiellanus He & Chen, 2000: 686. Holotype in Institute of Insect Sciences in Zhejiang University (Hangzhou) and examined by CvA.

Material examined. 1 ♀, labelled “Macr. 087” (IEBR), South Vietnam: Dong Nai, Vinh Cuu, Phu Ly, forest, 11°29’10.3’’N 107°09’58.8’’E, 285 m, light trap, 7.vi.2020, PT Nhi; 1♀ (IEBR), “ Macr. 086 ” (RMNH), id.; 2♀, labelled “Macr. 048 ” and “Macr. 049 ” (IEBR), South Vietnam: Dong Nai, Vinh Cuu, Phu Ly, forest, 11°29’10.3’’N 107°09’58.8’’E, 285 m, light trap, 03.viii.2008, HV Tru; 2♀, labelled “Macr. 129 ” (RMNH), “Macr. 130 ” (IEBR), Central Vietnam: Quang Nam, Bac Tra My, Tra Doc, light trap, 13.iii.2021, PT Nhi; 1♀, labelled “Macr. 173 ” (IEBR), CH Vietnam: Kon Tum province, Chu Mom Ray NP, 14°25’28.1” N 107°47’16.8”E, 570 m, light trap, 24.iv.2022, Pham V Phu.

Redescription. Female from Dong Nai (labelled “Macr. 087 ” IEBR), body length 9.4 mm, fore wing length 7.5 mm, antenna 13.6 mm, ovipositor sheath 9.6 mm (Fig. 5).

Head.Antenna with 52 flagellomeres; first flagellomere 1.3 × second one; length of first and second flagellomeres 6.5 and 5.0 × their width, respectively; length of subapical antennomere 2.5 × its width; in frontal view, width of face 0.8 × its length (Fig. 6B); maxillary palp very long, its length 2.15 × height of head; face sparsely punctate laterally and dorsally, median triangular area above clypeus with divergent rugulose punctures (Fig. 6B); clypeus convex, mostly smooth with fine scattered punctures; malar space 0.8 × as long as basal width of mandible; clypeus convex, straight ventrally; distance between tentorial pits 2.1 × distance from pit to eye margin; in lateral view, eye 7.25 × temple medially; head 2.5 × as wide as long medially (Fig. 6A) and temple very short, eye 10.0 × as long as temple in dorsal view; ocelli large, POL: OD: OOL = 10: 7: 10; frons, vertex and temple smooth (Fig. 6A).

Mesosoma. Length of mesosoma 1.45 × its height; pronotal trough sparsely crenulate; shiny, smooth ventrally and dorsally; propleuron smooth (Fig. 6E); middle lobe of mesoscutum without impressions anteriorly; notauli narrowly converging posteriorly and V-shaped, mostly smooth antero-medially, coarsely crenulate posteriorly (Fig. 6D); median and lateral lobes of mesoscutum shiny, coriaceous to smooth; scutellar sulcus 0.4 × as long as scutellum, with 3 interrupted carinae; scutellum smooth with fine sparse punctures; mesopleuron rugose-punctate medially, punctate ventrally and dorsally, except smooth area medio-dorsally (Fig. 6E); mesopleuron smooth; metapleuron largely rugose-punctate; propodeum irregularly rugulose (Fig. 6C).

Wings. Length of fore wing 3.0 × its maximum width; length of pterostigma 4.6 × its width; vein SR1 of fore wing straight, 2.5 × as long as vein 3-SR; r: 3-SR: SR1 = 15: 26: 62; vein M+CU1 widened apically; vein 1-CU1 short and thick, nearly quadrate (Fig. 6F); vein cu-a curved, inclivous; cu-a: 2-CU1 = 13: 35; vein 2-SR+M very long, 2-SR+M: 2-SR: 3-SR: r-m = 25: 19: 26: 11; r: 3-SR: SR1 = 16: 26: 65 (Fig. 6F); subbasal cell of fore wing widened and largely glabrous apically; second submarginal cell slightly narrowed distally; hind wing with vein 2-SC+R longitudinal (Fig. 6G); vein cu-a straight, mostly perpendicular; cu-a: 1-M: 1r-m = 15: 15: 10; vein SR mostly straight; marginal cell narrower basically than medially, distinctly widened apically (Fig. 6G).

Legs. Fore femur basally as wide as apically, moderately dense setose ventrally, and longer than setose dorsally; hind coxa densely setose latero-ventrally, but without setae dorso-apically; length of femur, tibia and basitarsus of hind leg 7.3, 15.4 and 12.25 × their maximum width, respectively; left hind trochantellus with 3 teeth apically (Fig. 6I); length of hind inner and outer tibial spurs 0.4 × and 0.3 × hind basitarsus, respectively; length of hind basitarsus 0.45 × hind tibia and 1.1 × second-fifth tarsus combined; tarsal claw with large acute lobe.

Metasoma. Length of metasoma 1.7 × head and mesosoma combined; first tergite metasomal tergite elongate, parallel-sided, flat medio-basally; length of first tergite 5.5 × its apical width, without basal excavation (Fig. 6H); second tergite distinctly constricted medially (Fig. 6H); length of second tergite 1.2 × third tergite medially; first metasomal tergite without laterope, flat medio-basally, with fine transverse striation entirely, second tergite with sparse longitudinal striation, except coriaceous area at apex; third tergite smooth with sparse punctate and setae; remaining metasomal tergites coriaceous, densely setose (Fig. 6H); length of ovipositor 1.3 × fore wing.

Colour. Frons and vertex black; face and temple brown; malar space, clypeus, mandible palpi and antenna yellow; mesosoma yellow, except median lobe of mesoscutum yellowish brown anteriorly; all the legs yellow; wing veins yellowish brown; pterostigma yellow; wing membrane hyaline; first-third metasomal tergites yellow; fourth tergite brownish-yellow; the remainder dark brown; ovipositor sheath yellowish-brown; ovipositor yellow.

Variation (females). Antenna 51–52 flagellomeres; length of body 8.0– 9.4 mm, of fore wing 6.6–7.5 mm; length of ovipositor sheath 8.7–9.6 mm; vein SR1 of fore wing 2.2–2.6 × vein 3-SR.

Male: Unknown.

Biology: Unknown.

Notes. This species was keyed out by using He et al. (2000). Above we provide the redescription of Leptozele radiellanus based on the Vietnamese female “Macr. 087 ” (IEBR, Ha Noi).

Distribution. Oriental: China (Guangxi); Central Vietnam: Quang Nam; Central Highlands Vietnam (Kon Tum); South Vietnam: Dong Nai. New record for Vietnam.