Butterflies and Moths of North America

collecting and sharing data about Lepidoptera

  Sighting 1172828

Northwestern Fritillary
Speyeria hesperis

Observation date: July 11, 2018
Submitted by: taogirl
Specimen type: Photograph
Observation notes: perhaps an Atlantis Fritillary
Status: Resident
Verified by: mikefisher
Verified date: August 13, 2018
Coordinator notes: We have both hesperis (Northwestern Fritillary) and atlantis (Atlantis Fritillary) in Colorado. The disc on the underside of the hindwings is always reddish on hesperis - as is the one in your photo - and dark chocolate on atlantis and the spots are smaller and more round. Both of these occur together on the Uncompahgre Plateau in Delta and Montrose County and probably on Grand Mesa (I have gotten hesperis there but not atlantis which usually occurs up much higher). Mike
Checklist region(s): Mesa County, United States, Colorado