Key to Austerocardiochiles species from Oriental region

1. Epicnemial carina absent; hind basitarsus almost cylindrical; first metasomal tergite widened apically (Figs 8, 23; Fig. 3 in Chen et al. 2004), length of first tergite 0.9–1.1 × as long as its maximum width................................... 2

- Epicnemial carina present; hind basitarsus distinctly compressed; first metasomal tergite slender, hardly or slightly widened apically (Figs 5, 8 in Chen et al. 2004; Fig. 6 in Ahmad & Shujauddin 2004), length of first tergite 1.4–2.0 × as long as its maximum width...................................................................................... 4

2. Antenna yellowish orange basally (Fig. 1); clypeus sharply convex ventrally, with faint tubercles (Fig. 3); vein SR1 of fore wing evenly curved basally (Figs 9, 10); hind wing with 4 hamuli (Fig. 11); hind tarsal claw pectinate with 5 teeth (Fig. 12). Vietnam .......................................................................... A. mellosus Long, sp. n.

- Antenna dark brown to black entirely (Fig. 14); clypeus evenly convex ventrally, with obsolescent tubercles (Fig. 16; Fig. 2 in Chen et al. 2004); hind wing with 6 hamuli (Fig. 22); vein SR1 of fore wing more or less angularly bent basally (Fig. 20, Fig. 1 in Chen et al. 2004); hind tarsal claw pectinate with 6 teeth (Fig. 25)........................................... 3

3. Vein SR1 of fore wing angularly bent in basal 0.2 (Fig. 1 in Chen et al. 2004); vein 1-CU1 0.27 × vein 2-CU1; length of first metasomal tergite 0.9 × as long as broad; median length of second tergite 0.62 × as long as third tergite (Fig. 3 in Chen et al. 2004). China ............................................................. tujiazu Chen, Whitfield & He, 2004

- Vein SR1 of fore wing hardly bent in basal (Fig. 20); vein 1-CU1 0.4 × vein 2-CU1; length of first metasomal tergite 0.95 × as long as broad; median length of second tergite 0.52 × as long as third tergite (Fig. 24). Vietnam .... A. simulatus Long, sp. n.

4. Vein SR1 of fore wing more or less evenly curved basally (Fig. 4 in Chen et al. 2004; Fig. 7 in Ahmad & Shujauddin 2004);. length of first metasomal tergite 1.6–2.0 × as long as wide (Fig. 5 in Chen et al. 2004; Fig. 6 in Ahmad & Shujauddin 2004) 5

- Vein SR1 of fore wing vein SR1 of fore wing angularly bent in basal 0.24 (Fig. 7 in Chen et al. 2004);....... length of first metasomal tergite 1.4 × as long as its maximum width (Fig. 8 in Chen et al. 2004). China ............................................................................................ A. zhejiangensis Chen, Whitfield & He, 2004

5. Hind wing with 3 evenly spaced hamuli; hind tarsal claw pectinate with 8–9 teeth (Fig. 9 in Ahmad & Shujauddin 2004); first metasomal tergite 1.6 × as long as its maximum width (Fig. 6 in Ahmad & Shujauddin 2004). India ..................................................................................... A. glochidionae Ahmad & Shujauddin, 2004

- Hind wing with 5 evenly spaced hamuli; hind tarsal claw pectinate with 7 teeth; first metasomal tergite 2.0 × as long as its maximum width (Fig. 5 in Chen et al. 2004). China ........................... A. xibouzu Chen, Whitfield & He, 2004