| Ambodina Sharp, 1883 |
| Ambodina granulata Sharp, 1883 |
| Ambracyptus Lundgren, 1984 |
| Ambracyptus minutissima (Seevers, 1971) |
| Amichorus Sharp, 1884 |
| Amichorus cyaneus Sharp, 1884 |
| Amichorus fauveli Sharp, 1884 |
| Amphichroum Kraatz, 1858 |
| Amphichroum floribundum LeConte, 1863 |
| Anacyptus Horn, 1877 |
| Anacyptus testaceus (LeConte, 1863) |
| Ancaeus Fauvel, 1864 |
| Ancaeus megacephalus Fauvel, 1864 |
| Ancaeus politus Sharp, 1887 |
| Anchylarthron Brendel, 1887 |
| Anchylarthron ctenisternum Park, 1945 |
| Aneucamptus Sharp, 1887 |
| Aneucamptus crassus (Sharp, 1876) |
| Aneucamptus excisicollis (Mostchulsky, 1860) |
| Anisolinina Hayashi, 1993 |