1	Sub-orbital band absent, anterior of central stripe deeper than posterior, ≥ 30 anal fin rays (Fig. 18A)	B. pi
–	Sub-orbital band present, anterior of central stripe depth equal to posterior, ≤ 29 anal fin rays (Fig. 18B)	2
2	Sub-orbital band connects to second post-orbital band, anal fin rear tip rounded and beyond caudal fin base (Fig. 19A)	B. simplex
–	Sub-orbital band separates from second post-orbital band, anal fin rear tip pointed and extend to caudal fin base (Fig. 19B)	3
3	First sub-marginal stripe at anal fin edge present and second sub-marginal stripe absent (Fig. 20A)	4
–	Marginal stripe or second sub-marginal stripe at anal fin edge present (Fig. 20B) or pigmentation covers entire anal fin (Fig. 20C)	5
4	Second post-orbital and pectoral base band absent, central stripe separates from caudal spot (Fig. 21A)	B. prima
–	Second post-orbital and pectoral base band present, central stripe connects to caudal spot (Fig. 21B)	B. pallida
5	Marginal stripe, sub-marginal stripe at anal fin, second post-orbital band present (Fig. 22A)	B. apollon
–	Second post-orbital band and marginal stripe at anal fin edge fade or absent	6
6	Heavily sub-orbital band, second post-orbital band fade (Fig. 22B)	B. pugnax
–	Lightly sub-orbital band, second post-orbital band absent (Fig. 22C)	B. ferox