| Xerostictia Gillaspy, 1963 |
| Xerostictia longibarbis Gillaspy, 1963 |
| Xerostictia longibarbis subsp. boharti Gillaspy, 1963 |
| Xestocrabro Ashmead, 1899 |
| Xylocrabro Ashmead, 1899 |
| Xylocrabro umbrosus Schrottky, 1914 |
| Yambal Tsuneki, 1990 |
| Yanonius Tsuneki, 1956 |
| Yuchiha Pate, 1944 |
| Zanysson Rohwer, 1921 |
| Zanysson chichimeca Pate, 1938 |
| Zanysson dives (Handlirsch, 1887) |
| Zanysson mexicanus Cresson, 1882 |