Butterflies and Moths of North America

collecting and sharing data about Lepidoptera

  Sighting 1150565

Northwestern Fritillary
Speyeria hesperis

Observation date: August 04, 2017
Submitted by: Tim Shortell
Specimen type: Photograph
Observation notes: None.
Status: Resident
Verified by: mikefisher
Verified date: January 03, 2018
Coordinator notes: Both the Atlantis Fritillary and this one on the picture you submitted - the Northwestern Fritillary (Speyeria hesperis) occur in Colorado. They can be separated by two main characters. The NW Frit has a reddish disc with the silver spots on the ventral hindwing and it is usually a bigger butterflies than Atlantis. Atlantis (usually smaller) have a blackish-brown, sometimes chocolate colored disc with the silver spots. The NW frit in western Colorado has silver spots and represents subspecies electa and in some places there occurs along with the Atlantis frit. In eastern Colorado the NW frit has unsilvered spots with the red disc (rarely fully silvered). Mike
Checklist region(s): Gunnison County, United States, Colorado