New York Natural Heritage Program
Hessel's Hairstreak
Callophrys hesseli (Rawson and Ziegler, 1950)
Hessel's Hairstreak Jeffrey Pippen
Family: Blues, Coppers, Hairstreaks, Elfins (Lycaenidae)

State Protection: Endangered
A native species in imminent danger of extirpation or extinction in New York (includes any species listed as federally Endangered by the United States). It is illegal to take, import, transport, possess, or sell an animal listed as Endangered, or its parts, without a permit from NYSDEC. 1) Any native species in imminent danger of extirpation or extinction in New York. 2) Any species listed as endangered by the United States Department of the Interior.

Federal Protection: Not Listed

State Rarity Rank: S1
A State Rarity Rank of S1 means: Typically 5 or fewer occurrences, very few remaining individuals, acres, or miles of stream, or some factor of its biology makes it especially vulnerable in New York State.

Global Rarity Rank: G3G4
A Global Rarity Rank of G3G4 means: Vulnerable globally, or Apparently Secure -- At moderate risk of extinction, with relatively few populations or locations in the world, few individuals, and/or restricted range; or uncommon but not rare globally; may be rare in some parts of its range; possibly some cause for long-term concern due to declines or other factors. More information is needed to assign a single conservation status.

Did you know?
This is the only butterfly species whose caterpillar feeds exclusively on Atlantic White Cedar.

State Ranking Justification [-]
Although this species is one of just a handful of butterflies on the state endangered species list, nothing is known of its current status in New York. However, there is reason to believe that this species is extirpated from the state. All of the few known occurrences on Long Island were first- discovered about 1980, and since then only one of them has been found to harbor butterflies. At this site only 12 butterflies were collected during seven surveys between 1983-1989 and resurveys in the early and mid-1990s failed to turn up any butterflies at any of the formerly occupied sites. Mosquito spray programs on Long Island are known to kill the butterflies outright (Shapiro and Shapiro 1973) and there are myriad threats to the viability of its white cedar swamp habitat not only on Long Island, but rangewide. Only an estimated 5% of the historical Coastal plain white cedar swamps in New York remain. Past spraying for gypsy moths (especially DDT in the 1950s) is believed to have wiped out many colonies (NatureServe 2009).

Short-term Trends [-]

Long-term Trends [-]