Austerocardiochiles mellosus Long, sp. n.

(Figs 1–13)

Material. Holotype, female, ‘ Card.142 ’ (IEBR), S. Vietnam: Lam Dong, Bao Loc, Loc Chau, coffee orchard, 16.vi.2017, DT Hoa.

Description. Holotype, female, body length 8.1 mm, fore wing length 7.4 mm, antenna 5.8 mm, ovipositor sheath 1.4 mm (Fig. 1).

Head. Eyes densely pilose; antenna with 44 antennomeres; third antennomere 1.4 × second antennomere (10:7); apical antennomere 2.25 × as long as subapical antennomere; ventral margin of clypeus sharply convex with faint tubercles (Fig. 3); clypeal suture indistinct (Fig. 3); clypeus rugo-punctate; face width 2.9 × length of face and clypeus combined (44:15); face coarsely rugose (Fig. 3); distance between tentorial pits 2.1 × distance between pit and eye margin (19:9); basal width of mandible 1.6 × distance from mandible to eye margin (13:8); in dorsal view, head median length 0.5 × as long as width (40:78); eye length 1.1 × temple (21:19); POL:OD:OOL=6:5:18 (Fig. 2); frons depressed laterally, with median carina, finely transversely rugose (Fig. 2); in lateral view, transverse width of eye 0.9 × temple (14:15) (Fig. 4); vertex and temple with long, dense pilosities, coarsely rugo-punctate (Fig. 4).

Mesosoma. Length of mesosoma 1.55 × height (56:36); notauli rather deep, narrower anteriorly, wider posteriorly, crenulate (Fig. 5); median lobe of mesoscutum with a faint median depression, sparsely punctate; lateral lobes of mesoscutum sparsely punctate, more or less coriaceous-punctate posteriorly; scutellar sulcus 0.4 × as long as scutellum (9:21), with 3 carinae (Fig. 5); scutellum with lateral and apical carinae, punctate-reticulate; propodeum rugose, with dense and long pilosities laterally and posteriorly, with lateral and median transverse carinae; propodeal areola rather long (Fig. 7); propodeal areola length 1.7 × as long as width (24:14); epicnemial absent; precoxal sulcus wide and shallow, rugo-punctate; mesopleuron smooth medially, almost punctate-recticulate ventrally and dorsally (Fig. 6); metapleuron coarsely rugose (Fig. 6).

Legs. Fore tibial spur 0.75 × fore basitarsus (18:24); length of hind femur, tibia and basitarsus 2.9, 4.8 and 4.4 × their maximum width, respectively; inner hind tibial spur 1.3 × outer tibial spur (12:9), and 0.54 × hind basitarsus (12:22); hind basitarsus 0.45 × hind tibia (22:48), and slightly longer hind tarsus 2–5; hind tarsal claws pectinate, with 5 teeth (Fig. 12); hind coxa densely punctate; hind femur shiny, sparsely punctate.

Wings. Length of fore wing 3.0 × its maximum width (108:36); pterostigma length 3.5 × width (46:13) (Fig. 9); r:3-SR:s-SR=6:27:18; vein 2-SR+M 1.9 × vein m-cu (15:8); vein m-cu 0.4 × vein 1-M (6:15); vein1-CU1 0.25 × vein 2-CU1 (5:20) and 0.55 × vein cu-a (5:9); second submarginal cell 2.3 × as long as wide (55:24); length of hind wing 4.4 × its maximum width (106:24); vein M+CU subequal to vein 1-M (31:32); vein 1-M 5.3 × vein 1r-m (32:6) (Fig. 13); hind wing with 4 hamuli (Fig. 11); vein 2-SC+R vertical (Fig. 13).

Metasoma. Metasoma 0.9 × as long as head and mesosoma combined (58:64); first metasomal tergite widened apically (Fig. 8), 1.1 × as long as broad (36:33), 1.6 × as long as propodeum (36:22); first metasomal tergite smooth basally, almost coarsely rugo-punctate latero-apically; second tergite with basal area (Fig. 8), coriaceous; median length of second tergite 0.7 × as long as third tergite (12:18) (Fig. 8); metasomal tergites 2–5 coriaceous, covered with short, rather dense pilosities (Fig. 8); hypopygium sparsely setose, blunt apically, with median longitudinal desclerotized and membranous area throughout, folded medially; ovipositor sheath widened apically, setose part of ovipositor sheath 1.25 × as long as hind basitarsus (20:16).

Color. Black; scape and basal half of antenna yellow; mandible and glossa black basally, yellow apically; palpi black; fore leg yellow, except coxa and trochanter black; middle coxa and femur black, except yellow extreme-apically; middle tibia and tarsus dark brown to black, except tibia yellow basally (Fig. 1); hind leg black, except base of hind tibia pale yellow; wing veins dark brown; fore wing hyaline basally, black apically (Figs. 1, 9); hind wing hyaline in basal two third, darkish brown in one third apical (Figs 1, 13).

Male: Unknown.

Etymology. From “mellosus” (Latin for “honeycolored”), because honey yellow of fore leg and basal half of antenna contrasts with black apical half.

Biology: Unknown.