| Aulosyta Strand, 1928 |
| Auma Dbar, 1984 |
| Australophion Morley, 1912 |
| Austropimpla Brèthes, 1913 |
| Bachia Förster, 1869 |
| Bachiana Strand, 1928 |
| Balcarcia Brèthes, 1922 |
| Banchinae Wesmael, 1845 |
| Banchini Wesmael, 1845 |
| Banchus Fabricius, 1798 |
| Banchus caudatus Provancher, 1886 |
| Banchus fugitivus (Say, 1836) |
| Banchus mexicanus Cameron, 1886 |
| Barichneumon Thomson, 1893 |
| Barichneumon additus (Cresson, 1874) |
| Barichneumon aztecus (Cameron, 1886) |
| Baryceros Gravenhorst, 1829 |
| Baryceros abdominalis (Cresson, 1874) |
| Baryceros audax (Cresson, 1878) |
| Baryceros bilineatus (Brullé, 1846) |