Milbert's Tortoiseshell
Aglais milberti (Godart, 1819)
Family: Nymphalidae
Subfamily: Nymphalinae
Identification: Forewing tip squared-off. Upperside is black with a wide orange submarginal band which grades to yellow at the inner edge of band. Narrow black marginal border on both wings; the hindwing border may contain some blue spots.
Wing Span: 1 5/8 - 2 1/2 inches (4.2 - 6.3 cm).
Life History: In the afternoon, males perch on hillsides, banks of gulches, logs, or behind bushes to watch for females. Eggs are laid in large batches of up to 900 on the underside of host plant leaves. Young caterpillars feed together in a web, while older ones feed alone and make shelters of folded leaves tied with silk. Adults hibernate, sometimes in small groups.
Flight: Two broods from May-October.
Caterpillar Hosts: Nettles (Urtica dioica and U. procera).
Adult Food: Usually flowers, such as thistles, goldenrods, and lilacs; probably also sap and rotting fruit.
Habitat: Wet areas near woodlands, moist pastures, marshes.
Range: Boreal North America south of the taiga. Southern Alaska south to California, Nevada, and New Mexico; east to Newfoundland and West Virginia.
Conservation: Not required.
NCGR:
Management Needs: None reported.
Alternate Scientific Names:
Nymphalis milberti
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Verified Sightings
Displaying 49 - 72 of 2736 verified sightings
Observation date: Aug 25, 2023
Submitted by: MinPinLord
Region: Alberta, Canada
Verified by: Paul Prappas
Verified date: Sep 28, 2023
Observation date: Sep 08, 2023
Submitted by: NewbieWatcher
Region: Alberta, Canada
Verified by: Paul Prappas
Verified date: Sep 28, 2023
Observation date: Jul 20, 2023
Submitted by: Paul C. Agidius
Region: Latah County, Idaho, United States
Verified by: stevekohler
Verified date: Sep 12, 2023
Observation date: Aug 29, 2023
Submitted by: John Gibbons
Region: Newfoundland and Labrador, Canada
Verified by: jmgesell
Verified date: Sep 02, 2023
Observation date: Aug 09, 2023
Submitted by: Allison Barta
Region: Beltrami County, Minnesota, United States
Verified by: jmgesell
Verified date: Aug 28, 2023
Observation date: Aug 14, 2023
Submitted by: NikkiM
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Aug 24, 2023
Observation date: Aug 06, 2018
Submitted by: Cactuswren1976
Region:
Verified by: James Steen
Verified date: Aug 21, 2023
Observation date: Dec 29, 2017
Submitted by: origamiotaku
Region: Salt Lake County, Utah, United States
Verified by: James Steen
Verified date: Aug 21, 2023
Observation date: Jul 30, 2017
Submitted by: dingoqueen
Region: Box Elder County, Utah, United States
Verified by: James Steen
Verified date: Aug 21, 2023
Observation date: Jul 27, 2017
Submitted by: dingoqueen
Region: Utah, United States
Verified by: James Steen
Verified date: Aug 21, 2023
Observation date: Jul 30, 2017
Submitted by: mhearell
Region: Box Elder County, Utah, United States
Verified by: James Steen
Verified date: Aug 21, 2023
Observation date: Jun 18, 2017
Submitted by: ezeemonee
Region: Salt Lake County, Utah, United States
Verified by: James Steen
Verified date: Aug 21, 2023
Observation date: Aug 04, 2023
Submitted by: Robert Gorman
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Aug 18, 2023
Observation date: Aug 14, 2023
Submitted by: Dobber31
Region: Alpine County, California, United States
Verified by: Ken Davenport
Verified date: Aug 17, 2023
Observation date: Aug 16, 2023
Submitted by: Steve Parmenter
Region: Placer County, California, United States
Verified by: Ken Davenport
Verified date: Aug 16, 2023
Observation date: Aug 13, 2023
Submitted by: Todd Boland
Region: Newfoundland and Labrador, Canada
Verified by: jmgesell
Verified date: Aug 13, 2023
Observation date: Jul 22, 2023
Submitted by: NikkiM
Region: Park County, Wyoming, United States
Verified by: J_Martineau
Verified date: Aug 10, 2023
Observation date: Aug 04, 2023
Submitted by: Geoff Urwin
Region: Saskatchewan, Canada
Verified by: alchem30
Verified date: Aug 09, 2023
Observation date: Jul 20, 2023
Submitted by: flyinganvil
Region: Wallowa County, Oregon, United States
Verified by: Ken Davenport
Verified date: Aug 07, 2023
Observation date: Jul 31, 2023
Submitted by: natureali
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Aug 07, 2023
Observation date: Jul 31, 2023
Submitted by: natureali
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Aug 07, 2023
Observation date: Jun 09, 2023
Submitted by: bshettler
Region: Manitoba, Canada
Verified by: chalicerae
Verified date: Aug 06, 2023
Observation date: Jul 16, 2023
Submitted by: JenniferLupine
Region: Pierce County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 04, 2023
Observation date: Jul 26, 2023
Submitted by: Lori Bellis
Region: Washoe County, Nevada, United States
Verified by: Ken Davenport
Verified date: Jul 27, 2023
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