| Xanthandrus (Xanthandrus) | | Mengual, Ximo; Skevington, Jeff | |
| Xanthandrus (Xanthandrus) comtus (Harris) | | Mengual, Ximo | en |
| Xanthandrus (Xanthandrus) nitidulus Fluke | | Mengual, Ximo; Skevington, Jeff | en |
| Xanthogramma | | Mengual, Ximo; Skevington, Jeff | |
| Xanthogramma pedissequum (Harris) | | Mengual, Ximo | en |
| Xylota | | Skevington, Jeff; Mengual, Ximo | |
| Xylota (Ameroxylota) | | Mengual, Ximo; Skevington, Jeff | |
| Xylota (Ameroxylota) flukei (Curran) | | Skevington, Jeff; Mengual, Ximo | en |
| Xylota (Brachypalpoides) | | Mengual, Ximo; Skevington, Jeff | |
| Xylota (Brachypalpoides) lenta Meigen | | Mengual, Ximo; Skevington, Jeff | en |
| Xylota (Haploxylota) | | Skevington, Jeff; Mengual, Ximo | |
| Xylota (Haploxylota) sichotana Mutin | | Skevington, Jeff; Mengual, Ximo | en |
| Xylota (Hovaxylota) | | Skevington, Jeff; Mengual, Ximo | |
| Xylota (Sterphoides) | | Skevington, Jeff; Mengual, Ximo | |
| Xylota (Xylota) | | Mengual, Ximo; Skevington, Jeff | |
| Xylota (Xylota) florum (Fabricius) | | Mengual, Ximo; Skevington, Jeff | en |
| Xylotina | | Skevington, Jeff | |
