| Arixiuna prolixa (Bates, 1872) |
| Arixiuna varians (Bates, 1881) |
| Asemini Thomson, 1860 |
| Asemolea Bates, 1881 |
| Asemolea crassicornis Bates, 1881 |
| Asemum Eschscholtz, 1830 |
| Asemum caseyi Linsley, 1957 |
| Asemum glabrellum Bates, 1892 |
| Assycuera Napp & Monné, 2001 |
| Assycuera macrotela (Bates, 1880) |
| Assycuera rubella (Bates, 1892) |
| Assycuera scabricollis (Chemsak, 1963) |
| Asynapteron Martins, 1970 |
| Asynapteron glabriolum (Bates, 1872) |
| Asyngenes Bates, 1880 |
| Asyngenes (Neosyngenes) Breuning, 1943 |
| Asyngenes (Neosyngenes) venezuelensis Breuning, 1943 |
| Ataxia Haldeman, 1847 |
| Ataxia alpha Chemsak & Noguera, 1995 |
| Ataxia arizonica Fisher, 1920 |