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B. olba
- metasomal segments 1-3 entirely O-Y
- T4-6 broadly transversely Y apically
- S2 process large, rounded below, concave behind
- mesopleura Y above, B below (including venter)
image courtesy Kerry Stuart: https://inaturalist.ala.org.au/observations/342858697
B. olba
- metasomal segments 1-3 entirely O-Y
- T4-5 broadly transversely Y apically (T6 not visible here)
- S2 process large, rounded below, concave behind
- wings subhyaline (not heavily infuscated)
- mesopleura Y above, B below (including venter)
image courtesy Jean and Fred Hort: https://inaturalist.ala.org.au/observations/68527581
B. wilcannia
- T1-3 broad orange bands apically, B basally
- clypeus entirely black
- mesopleura & venter black
- S2 process small, angulate
image courtesy LGJ: https://inaturalist.ala.org.au/observations/337896162
B. wilcannia
- front basitarsus with 6 pecten spines
- front tarsomeres 3 & 4 with strong apical flanges beneath
image courtesy LGJ: https://inaturalist.ala.org.au/observations/337896162