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 1 - 24 of 2733 verified sightings
Observation date: Sep 14, 2024
Submitted by: ezeemonee
Region: Teller County, Colorado, United States
Verified by: mikefisher
Verified date: Nov 09, 2024
Observation date: Aug 28, 2021
Submitted by: dvollmar
Region: San Miguel County, Colorado, United States
Verified by: mikefisher
Verified date: Oct 07, 2024
Observation date: Sep 20, 2024
Submitted by: srhflsmck
Region: Missoula County, Montana, United States
Verified by: J_Martineau
Verified date: Sep 23, 2024
Observation date: Sep 07, 2024
Submitted by: NikkiM
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Sep 12, 2024
Observation date: Jul 29, 2024
Submitted by: ncrosbyrd
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Sep 04, 2024
Observation date: Aug 06, 2024
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Aug 24, 2024
Observation date: Aug 14, 2024
Submitted by: rapids
Region: Newfoundland and Labrador, Canada
Verified by: jmgesell
Verified date: Aug 23, 2024
Observation date: Aug 02, 2024
Submitted by: NikkiM
Region: Baker County, Oregon, United States
Verified by: Ken Davenport
Verified date: Aug 12, 2024
Observation date: Jul 31, 2024
Submitted by: Marta Reece
Region: Socorro County, New Mexico, United States
Verified by: stevecary
Verified date: Aug 05, 2024
Observation date: Jun 24, 2024
Submitted by: k.d.stutzman
Region: Park County, Wyoming, United States
Verified by: J_Martineau
Verified date: Jul 18, 2024
Observation date: Jul 13, 2024
Submitted by: Cactuswren1976
Region: Taos County, New Mexico, United States
Verified by: stevecary
Verified date: Jul 16, 2024
Observation date: Jul 02, 2024
Submitted by: hasfitz5
Region: Washoe County, Nevada, United States
Verified by: Ken Davenport
Verified date: Jul 10, 2024
Observation date: Jul 05, 2024
Submitted by: Cactuswren1976
Region: Santa Fe County, New Mexico, United States
Verified by: stevecary
Verified date: Jul 08, 2024
Observation date: Jun 29, 2024
Submitted by: NikkiM
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Jul 08, 2024
Observation date: Jul 02, 2024
Submitted by: sandyleapt
Region: Benton County, Oregon, United States
Verified by: Ken Davenport
Verified date: Jul 06, 2024
Observation date: Jun 25, 2024
Submitted by: Lupine1
Region: Pierce County, Washington, United States
Verified by: davidwdroppers
Verified date: Jun 28, 2024
Observation date: May 09, 2024
Submitted by: Jessully1104
Region: Saskatchewan, Canada
Verified by: alchem30
Verified date: Jun 26, 2024
Observation date: Apr 24, 2024
Submitted by: scienceofthemind
Region: Saskatchewan, Canada
Verified by: alchem30
Verified date: Jun 26, 2024
Observation date: Sep 30, 2023
Submitted by: Ldmcmama
Region: Saskatchewan, Canada
Verified by: alchem30
Verified date: Jun 26, 2024
Observation date: Jun 25, 2024
Submitted by: Bwabbit
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Jun 25, 2024
Observation date: Jun 22, 2024
Submitted by: weflybye
Region: Pierce County, Washington, United States
Verified by: davidwdroppers
Verified date: Jun 23, 2024
Observation date: May 13, 2024
Submitted by: hasfitz5
Region: White Pine County, Nevada, United States
Verified by: Ken Davenport
Verified date: Jun 05, 2024
Observation date: Aug 16, 2023
Submitted by: MomoButterfly
Region: Alberta, Canada
Verified by: jmgesell
Verified date: May 22, 2024
Observation date: May 16, 2024
Submitted by: Geoff Urwin
Region: Saskatchewan, Canada
Verified by: Tom Middagh
Verified date: May 19, 2024
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