New York Natural Heritage Program
Northern Oak Hairstreak
Satyrium favonius ontario (W. H. Edwards, 1868)

New York State Distribution [-]
The New York State distribution is mostly in the lower Hudson Valley and on Long Island. The distribution also includes the Albany Pine Bush where one was collected in 1979. Historically, it was present in at least the Ithaca area, but according to Robert Dirig there are no records in that area since 1970, after collections in 1890, 1967, and 1970. Since 2000, there have been credible reports from Orange, Westchester, Rockland, and Suffolk Counties. As Shapiro (1974) noted, the habitat is not rare in southeastern New York.

Global Distribution [-]
The original specimen supposedly came from Ontario, Canada. However, since 1900 this subspecies has been found from the vicinity of Boston, Massachusetts (not before about 1980) south though coastal New England, southeastern New York, and then more widely from New Jersey through most of Georgia and west into Texas and Oklahoma. While it does occur in much of the lower Midwest east into Ohio and widely in the southeastern states, this species is unknown from the mountains.