Hydaspe Fritillary is a species of orange-brown butterfly found in the western portions of the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 and Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

. A small fritillary, it usually has cream-colored underwing spots, but the Vancouver Island subspecies has silver spots. It is similar to S. zerene

Speyeria zerene

Zerene Fritillary is a species of butterfly found in the western portions of the United States and Canada.-Description:...

and S. atlantis

Speyeria atlantis

The Atlantis Fritillary is a butterfly of the Nymphalidae family of North America. It is from the Avalon Pennisula of Newfoundland and Labrador to northern British Columbia, across northern United States south as far as Colorado and West Virginia...

, but may be distinguished by the smooth and even appearance of its postmedian spotband.
The caterpillars feed on violets including Viola glabella

Viola glabella

Viola glabella, the Stream Violet or Pioneer Violet, is usually found along streams or in moist woods in northeastern Asia and northwestern North America....

. A single brood flies from July through September and feeds on flower nectar. They may be found in moist forests, in clearings and subalpine meadows.