Sighting for June 4, 2021

Brian McGurgan

Chugach State Park, Flattop Mountain, Glen Alps trailhead
Anchorage Municipality, AK

Sunny but very breezy late afternoon. I selected “Western White” because an option for “Margined White” isn’t available. I’m referencing Butterflies of Alaska by Ken Philip and Cliff Ferris, which includes Pieris marginalis but not Pontia occidentalis. I’d welcome correction on the Polaris Fritillary. I was leaning toward Freija Fritillary based on reference to the Butterflies of Alaska guide but of the options provided here Boloria polaris seems closest in appearance. Unfortunately I didn’t get a view of the ventral side of the fritillary’s wings.

  • Canadian Tiger Swallowtail 1
  • Mustard White 1
  • Freija Fritillary 1
  • Milbert's Tortoiseshell 2

Freija Fritillary

Freija Fritillary

Milbert's Tortoiseshell

Milbert's Tortoiseshell

Mustard White