New York Natural Heritage Program
Northern Oak Hairstreak
Satyrium favonius ontario (W. H. Edwards, 1868)
Insects
Oak Hairstreak Erik Nielson
Family: Blues, Coppers, Hairstreaks, Elfins (Lycaenidae)

State Protection: Not Listed
The species is not listed or protected by New York State.

Federal Protection: Not Listed

State Rarity Rank: S2S4
A State Rarity Rank of S2S4 means: Imperiled or Vulnerable in New York, or Apparently secure -- Conservation status is uncertain, and could range from very vulnerable to disappearing from New York due to rarity or other factors, to vulnerable to becoming imperiled; or could be uncommon but not rare in New York. More information is needed to assign a single conservation status.

Global Rarity Rank: G4T4
A Global Rarity Rank of G4T4 means: Apparently Secure globally - Both the species as a whole and the subspecies/variety are uncommon in the world but not rare; usually widespread, but may be rare in some parts of its range; possibly some cause for long-term concern due to declines or other factors.


Did you know?
In New York, the northern oak hairstreak occurs in the lower Hudson Valley and on Long Island. It has likely been extripated from the Ithaca area since 1970.

State Ranking Justification [-]
Since the potential habitat is widespread in southeastern New York, and since the species probably spends most of its time in the canopy, it is probably much less rare than records indicate. Nevertheless, the habitat is spotty in heavily developed southeastern mainland New York, although the species could be more widespread on outer Long Island.

Short-term Trends [-]

Long-term Trends [-]