1. Fore wing with a brown to dark brown stripe, or with pale brown cloud (Figs 4, 17, 22); head and mesosoma metallic black or metallic blue-black (Figs 1, 14, 20)........................................................................2

- Fore wing completely hyaline; head and mesosoma dark metallic purple (Australia)................ B. peculicornis Girault

2. Fore wing with a brown to dark brown stripe (Figs 4, 22); antennal pedicel without a dark brown spot basally (Figs 3, 21)........................................................................................................ 3

- Fore wing with a pale brown cloud below stigmal vein (Fig. 17); antennal pedicel with a dark brown spot basally (Fig. 16) (China)................................................................................ B. bouceki sp. nov.

3. Fore wing with a transverse brown cloud apically (Fig. 4); antenna with scape and pedicel mostly pale (Fig. 3) (China)............................................................................................. B. balios sp. nov.

- Fore wing with a longitudinal brown stripe from stigmal vein to posterior margin of wing (Figs 20, 22); antenna with scape and pedicel completely brown to dark brown (Fig. 21) (China)...................................... B. virgatus sp. nov.