Bergenstamm, 1889 Argyrothelaira Townsend, 1916 Aridalia Curran, 1934 Arrhenomyza Malloch, 1929 Arrhinactia Townsend, 1927 Asetulia Malloch, 1938 Asilidotachina Townsend, 1931 Asseclamyia Reinhard, 1956 Atacta Schiner, 1868 Atactopsis Townsend, 1917 Atactosturmia Townsend, 1915 Ateloglossa Coquillett, 1899 Ateloglutus Aldrich, 1934 Athrycia Robineau-Desvoidy, 1830 Atlantomyia Crosskey, 1977 Atractocerops Townsend, 1916 Atrichiopoda Townsend, 1931 Atylomyia Brauer, 1898 Atylostoma Brauer & von Bergenstamm, 1889 Aulacephala Macquart, 1851 Austeniops Townsend, 1915 Australotachina Curran, 1938 Austromacquartia Townsend, 1934 Austronilea Crosskey, 1967 Austrophasiopsis Townsend, 1933 Austrophorocera Townsend, 1916 Austrophryno Townsend, 1916 Austrophytomyptera Blanchard, 1962 Avibrissia Malloch, 1932 Avibrissina Malloch, 1932 Avibrissosturmia Townsend, 1927 Azygobothria Townsend, 1911
B thumb|Blondelia nigripes