New York Natural Heritage Program
Hessel's Hairstreak
Callophrys hesseli (Rawson and Ziegler, 1950)

Threats [-]
Primary threats to the butterfly include gypsy moth and mosquito insecticide spraying, localized collecting pressure and possibly bird predation (NatureServe 2009). The threats to the species' habitat are numerous and both the Atlantic white cedar swamp community (S1) and C. thyoides itself are imperiled (S2) in New York. Only an estimated 5% of the historical Coastal plain white cedar swamps in New York remain (NYNHP 2011a) and over 15,000 acres of inland Atlantic white cedar were converted to agriculture in the Wallkill Valley alone by the 1970s (Karlin 1997). See NYNHP (2011a) for specific ongoing threats to Atlantic white cedar swamp communities.

Conservation Strategies and Management Practices [-]
Regardless of whether this Hairstreak still occurs in New York, all occurrences of Atlantic white cedar swamps, both coastal and inland, should be protected and managed to sustain the cedar trees. See NYNHP (2011a,b) and NatureServe (2009) for management recommendations and further references for manangement techniques in these community types.

Research Needs [-]
It is imperative to ascertain whether this endangered species remains extant in New York. All occurrences of Coastal plain Atlantic white cedar swamps on Long Island as well as Inland Atlantic white cedar swamps in Putnam and Orange Counties should be surveyed during May to early June to determine whether this species remains a part of New York's Lepidopteran fauna.