Northwestern Fritillary

Argynnis hesperis W. H. Edwards, 1864

Family: Nymphalidae

Status: Rare resident, possibly extirpated

NENHP Ranking: SH

Range: The Northwestern Fritillay is found through much of the northern United States and central and southern Canada from the Atlantic to the Pacific, and in montane areas in the western United States south into much of Arizona and New Mexico.

Broods/Flight Times: There is one flight. The few records from Nebraska are from 10-16 July.

Larval Hostplant(s): Various violets (Viola species)

Habitat: Pine Ridge canyons

Found at:

Overwintering: As unfed caterpillar

Similar Species:

Notes: Merritt Cary and his associates collected three or four “Atlantis” Fritillaries in Pine Ridge canyons in July of 1901 (these specimens are in the collections of the University of Nebraska at Lincoln). In 1998 it was determined that hesperis, formerly a subspecies of atlantis, was a separate species, and that Nebraska’s specimens were hesperis. Neither species has been found in Nebraska since that time.

Northwestern Fritillary, Photo by Matthew Brust
Atlantis Fritillary – dorsal
Atlantis Fritillary – ventral

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