Hi Scott,
I might be wrong, but I think that at some point in time DeLair, was actually "Dallaire".
Joseph Antoine probably changed his last name to "Delair" when he got to New-York.
Many Dallaires ancestry are found in the Chicoutimi area, so if you want, you can first try your luck with the "Societe de genealogie du Saguenay" at
http://www.cybernaute.com/sgs/The web site is in French, but if you send them an email (it can be in English) re Joseph Antoine Delair with wife Marion Lucy Boivin, chances are that they can help you.
Best of luck,
Esther