Check List of the Lepidoptera of North America... MS, database (version 2003)
Ongoing developmental version with contributions by Don Lafontaine, Jean-François Landry, Jim Troubridge, Paul Opler, Ron Hodges, John Brown, et al. Higher classification does not yet reflect recent and substantial changes that have been published
Checklist of North American Butterflies, 2nd Edition, website (version 2)
Produced by the North American Butterfly Association (NABA) Names Committee, and available online (with corrections) at http://www.naba.org/pubs/checklst.html (web page may not be identical to the printed edition)
Pierinae, Whites [English]
Pelham, Jonathan P.
A catalogue of the butterflies of the United States and Canada with a complete bibliography of the descriptive and systematic literature
Journal/Book Name, Vol. No.:
Journal of Research on the Lepidoptera, vol. 40
xiv + 658
As noted in the Introduction, Pelham intentionally diverges from the Code's provisions on gender agreement (Articles 31 & 34), following original orthography instead
ITIS taxonomy is based on the latest scientific consensus available,
and is provided as a general reference source for interested parties.
However, it is not a legal authority for statutory or regulatory purposes.
While every effort has been made to provide the most reliable and up-to-date
information available, ultimate legal requirements with respect to species
are contained in provisions of treaties to which the United States is a
party, wildlife statutes, regulations, and any applicable notices that have
been published in the Federal Register. For further information on U.S.
legal requirements with respect to protected taxa, please contact the
U.S. Fish and Wildlife Service.