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 97 - 120 of 2767 verified sightings
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
Observation date: Jul 20, 2023
Submitted by: shuckabone
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Jul 23, 2023
Observation date: Jul 22, 2023
Submitted by: RoxannaTessman
Region: Jackson County, Oregon, United States
Verified by: Ken Davenport
Verified date: Jul 23, 2023
Observation date: May 20, 2023
Submitted by: katb1
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Jul 23, 2023
Observation date: Jul 05, 2023
Submitted by: mrsclaus
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Jul 23, 2023
Observation date: Jul 17, 2023
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Jul 19, 2023
Observation date: Jul 14, 2023
Submitted by: Just Julie
Region: Yellowstone County, Montana, United States
Verified by: J_Martineau
Verified date: Jul 17, 2023
Observation date: Jul 12, 2023
Submitted by: John Gibbons
Region: Newfoundland and Labrador, Canada
Verified by: jmgesell
Verified date: Jul 14, 2023
Observation date: Jul 01, 2023
Submitted by: tjay13
Region: Taos County, New Mexico, United States
Verified by: stevecary
Verified date: Jul 02, 2023
Observation date: Jun 22, 2023
Submitted by: pauhana
Region: Boulder County, Colorado, United States
Verified by: mikefisher
Verified date: Jul 02, 2023
Observation date: Jun 16, 2023
Submitted by: cdisney
Region: Saskatchewan, Canada
Verified by: alchem30
Verified date: Jun 30, 2023
Observation date: Jun 23, 2023
Submitted by: Paul Prappas
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Jun 24, 2023
Observation date: May 03, 2023
Submitted by: KelseyM
Region: Alberta, Canada
Verified by: John Calhoun
Verified date: Jun 05, 2023
Observation date: May 01, 2023
Submitted by: Joyce Kozdrowski
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: May 06, 2023
Observation date: Apr 29, 2023
Submitted by: DeepSkyKelly
Region: Colfax County, New Mexico, United States
Verified by: stevecary
Verified date: May 04, 2023
Observation date: Aug 20, 2022
Submitted by: NikkiM
Region: Carbon County, Montana, United States
Verified by: stevekohler
Verified date: Apr 24, 2023
Observation date: Mar 21, 2021
Submitted by: wildebynature
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Apr 15, 2023
Observation date: Mar 21, 2021
Submitted by: wildebynature
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Apr 15, 2023
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