BioStor
 | Descriptions of New Species of North American Bees (1878) Proceedings of The Academy of Natural Sciences of Philadelphia 30: 181-221 |
 | Some Illinois bees Charles Robertson (1900) Transactions of the Academy of Science of Saint Louis 10: 47-55 |
 | The type species of the genera and subgenera of bees Grace A Sandhouse (1943) Proceedings of the United States National Museum 92(3156): 519-619 |
 | Genus-group names of bees and supplemental family-group names Charles D Michener (1997) Scientific Papers Natural History Museum University of Kansas 1: 1-81 |