Acadian Hairstreak

Satyrium acadica

The Acadian Hairstreak often perches on the tops of vegetation, usually near a good patch of willows, its host plant. This makes fresh, light gray Acadian Hairstreaks often easy to spot. On a butterfly count, one member of our group spotted this species, with binoculars, at over 40 yards.

I have seen five very fresh Acadian Hairstreaks perched within a two square meter area during a light rain. With the vegetation bent down, it was even easier to see and photograph (first photo) this species. In 2005, I saw over 10 of these on the same Swamp Milkweed plant, but only eight were left when I snapped the photo (second image).

Identifying characteristics

The Acadian Hairstreak is slightly larger than Edward’s and Banded Hairstreaks. It is light gray underneath, with with a conspicuous submarginal row of orange on the hindwing below that continues over the blue tail spot. A postmedian row of round black spots is very conspicuous on the light background of both wings. The hind wings have obvious tails.

Similar species

The Coral Hairstreak is similar in size and has the submarginal row of orange, but it has no tails. The Gray Copper could also be mistaken for this species, but the Gray Copper is larger, lighter, and has no tail.

Habitat

Wetland areas, especially marshes, with an abundance of willow, the host plant of this species.

Flight

One brood. It can be found from Late June through July.

Abundance

Locally common, but often may be found in small scattered colonies. In the Sandhill area in Wood County, in one day I saw over 30 individuals, an unusual concentration for this species.

Late Acadian Hairstreak Sightings

Date	County	Reported by
Aug 8, 2017	Manitowoc	Mike Reese, Julie and ...
Aug 8, 2003	Bayfield	Dave Hanson
Aug 8, 2011	Bayfield	Mike Reese, Ryan Brady
Aug 8, 2011	St. Croix	Douglas Belisle
Aug 12, 2017	Manitowoc	Mike Reese

Locations