Milbert’s Tortoise Shell

Aglais milberti (Godart, 1819)

Family: Nymphalidae

Status: Occasional resident

NENHP Ranking: S3, Tier 2

Range: This species is found throughout the southern half of Canada and Alaska and in the northern United States. In the western U. S. it extends southward at higher elevations into southern portions of California, Arizona and New Mexico. In Nebraska it has been found primarily in the panhandle although there are scattered records from eastern and southern counties as well.

Broods/Flight Times: Probably double brooded, with flights in early and late summer, the late summer adults overwintering and accounting for the early spring records. It is recorded in Nebraska from 13 April – 25 September.

Larval Hostplant(s): Stinging nettles (Urtica dioica)

Habitat: Adults are most often found in the rugged country of western Nebraska where their hostplants can be found along streams and in moister portions of canyons. 

Found at: Gilbert-Baker SWMA, Wildcat Hills SRA

Overwintering: As adults

Similar Species:

Notes: This butterfly has been observed in urban settings (Omaha, UN Campus-Lincoln) from time to time but not frequently enough to suspect that there are sustained populations there.

Milbert’s Tortoise Shell, Wildcat Hills, Photo by Colin Croft
Milbert’s Tortoise Shell – dorsal
Milbert’s Tortoise Shell – ventral

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