| Name | Eucephalus formosus Greene |
| Authorship | Greene |
| Rank | Species |
| Placed in | Eucephalus Nuttall |
| Citation | 1900 Pittonia 4(22C): 156 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Eucephalus formosus Greene |
| Identification made in | [no date] (1), 2016 (1) |