New York Natural Heritage Program
Edwards' Hairstreak
Satyrium edwardsii (Grote and Robinson, 1867)
Insects

General Description [-]
Species in this genus are all variable and a few specimens are very difficult to identify. Note the combination of relatively pale brown color, somewhat like pale females of several related species, and the rounded well separated spots on the hindwing.

Characters Most Useful for Identification [-]
Misidentifications are a problem in this genus. All identifications should be verified by an expert and based on specimens or several good images preferably showing at least two individuals. Species in this genus are all variable and a few specimens are very difficult to identify. Note the combination of relatively pale brown color, somewhat like pale females of several related species, and the rounded well separated spots on the hindwing. The spots are much more fused on the Banded Hairstreak (Satyrium calanus). The Coral Hairstreak (Satyrium titus) has a similar color and pattern, but lacks tails. The Acadian Hairstreak (Satyrium acadicum) is paler and much grayer and found near willows. All four can occur together where prarie willows occur among the scrub oaks near Albany.

Best Life Stage for Proper Identification [-]
Adults, but larvae probably could be identified from Allen et al. (2005).

Behavior [-]
The adults are localized around scrub oaks or on nearby flowers.

Diet [-]
The larvae feed on scrub oak spring growth. Other oaks are rarely or never used in New York.
Edwards' Hairstreak Images
click to enlarge
The Best Time to See
The larvae occur in the spring, with most probably pupating in early June in normal seasons. The adults occur mostly from late June to mid-July, but with stragglers flying into August in cooler areas or delayed seasons. There is only one generation range-wide. The majority of the year is spent as eggs.
J F M A M J J A S O N D
Active Reproducing Larvae present and active Eggs present outside adult Pupae or prepupae present
The time of year you would expect to find Edwards' Hairstreak active (red shading), reproducing (blue shading), larvae present and active (green shading), eggs present outside adult (orange shading) and pupae or prepupae present (purple shading) in New York.
Similar Species
  • Coral Hairstreak (Satyrium titus)
    The Coral Hairstreak (Satyrium titus) has a similar color and pattern, but it lacks tails.
  • Banded Hairstreak (Satyrium calanus)
    The rounded well separated spots on the hindwing of Edwards' hairstreak are much more fused on the Banded Hairstreak.
  • Acadian Hairstreak (Satyrium acadicum)
    The Acadian Hairstreak is paler and much grayer and is found near willows.