| Xenometra Emery, 1917 |
| Xenometra monilicornis Emery, 1917 |
| Xenomyrmex Forel, 1885 |
| Xenomyrmex floridanus Emery, 1895 |
| Xenomyrmex floridanus subsp. skwarrae Wheeler, 1931 |
| Xenomyrmex panamanus (Wheeler, 1922) |
| Xenomyrmex stollii Forel, 1885 |
| Xenomyrmex stollii subsp. castus Wheeler, 1931 |
| Xenomyrmex stollii subsp. cubanus Wheeler, 1931 |
| Xenomyrmex stollii subsp. floridanus Emery, 1895 |
| Xenomyrmex stollii subsp. lucayanus Wheeler, 1931 |
| Xenomyrmex stollii subsp. mexicanus Wheeler, 1931 |
| Xenomyrmex stollii subsp. nodosus Creighton, 1953 |
| Xenomyrmex stollii subsp. rufescens Wheeler, 1931 |
| Xiphomyrmex Forel, 1887 |
| Xiphomyrmex atomum Santschi, 1914 |
| Xiphomyrmex spinosus Pergande, 1896 |
| Xiphomyrmex spinosus subsp. hispidus Wheeler, 1915 |
| Xiphomyrmex spinosus subsp. insons Wheeler, 1915 |
| Xiphomyrmex spinosus subsp. wheeleri Forel, 1901 |