# Endangered and Threatened Wildlife and Plants; Endangered Status for the Island Marble Butterfly and Designation of Critical Habitat
> **US Fish and Wildlife Service** · Final rule. · Published 2020-05-05 · Effective 2020-06-04 · 85 FR 26786
## Document
- **Document number:** 2020-07856
- **Category:** endangered-species
- **Sub-agency:** US Fish and Wildlife Service
- **Federal Register citation:** 85 FR 26786
- **CFR reference:** 50 CFR 17
- **Publication date:** 2020-05-05
- **Effective date:** 2020-06-04
- **Interior docket:** Docket No. FWS-R1-ES-2016-0145
## Abstract

We, the U.S. Fish and Wildlife Service (Service), determine endangered species status under the Endangered Species Act of 1973 (Act), as amended, for the island marble butterfly (Euchloe ausonides insulanus) and designate critical habitat. In total, approximately 812 acres (329 hectares) on the south end of San Juan Island, San Juan County, Washington, fall within the boundaries of the critical habitat designation.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/05/05/2020-07856/endangered-and-threatened-wildlife-and-plants-endangered-status-for-the-island-marble-butterfly-and)
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