Scudder's Sulphur
Colias scudderi Reakirt, 1865
Family: Pieridae
Subfamily: Coliadinae
Identification: Upper surface of male lemon yellow; dark wide border cut by yellow veins. Females often white, with small black cell spot; border incomplete or lacking. Underside of both sexes dirty green.
Wing Span: 1 1/2 - 2 inches (3.8 - 5.1 cm).
Life History: Males patrol near willows for receptive females. Females lay eggs singly on young host plant leaves. Caterpillars eat leaves. Second-, third-, and fourth-stage caterpillars hibernate.
Flight: One flight from late June-August.
Caterpillar Hosts: Willow shrubs in the willow family (Salicaceae).
Adult Food: Flower nectar.
Habitat: Mountain meadows and willow bogs.
Range: Alaska south through Rocky Mountains to northern New Mexico.
Conservation: Not usually required.
NCGR: G4 - Apparently secure globally, though it might be quite rare in parts of its range, especially at the periphery.
Management Needs: Not reported.
Comments: NULL
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Verified Sightings
Displaying 1 - 24 of 72 verified sightings
Observation date: Mar 09, 2024
Submitted by: Joshua C
Region: Rio Arriba County, New Mexico, United States
Verified by: stevecary
Verified date: Apr 14, 2025
Observation date: Sep 02, 2024
Submitted by: Cascade Colors
Region: Jackson County, Colorado, United States
Verified by: mikefisher
Verified date: Sep 24, 2024
Observation date: Jul 28, 2024
Submitted by: Lisahug
Region: Clear Creek County, Colorado, United States
Verified by: mikefisher
Verified date: Sep 13, 2024
Observation date: Jul 22, 2023
Submitted by: ezeemonee
Region: Summit County, Colorado, United States
Verified by: mikefisher
Verified date: Sep 17, 2023
Observation date: Aug 03, 2017
Submitted by: JKlodzen
Region: Duchesne County, Utah, United States
Verified by: James Steen
Verified date: Aug 23, 2023
Observation date: Jul 17, 2021
Submitted by: Christian.Nunes
Region: Grand County, Colorado, United States
Verified by: mikefisher
Verified date: Feb 11, 2023
Observation date: Jul 15, 2014
Submitted by: Dwaine Wagoner
Region: Utah, United States
Verified by: RaisingButterfl...
Verified date: Dec 12, 2022
Observation date: Jun 29, 2022
Submitted by: twofried
Region: Taos County, New Mexico, United States
Verified by: stevecary
Verified date: Jul 17, 2022
Observation date: Apr 19, 2021
Submitted by: CTenglish
Region: Clear Creek County, Colorado, United States
Verified by: mikefisher
Verified date: May 03, 2021
Observation date: Jul 04, 2020
Submitted by: WYbutterflyer1
Region: Carbon County, Wyoming, United States
Verified by: J_Martineau
Verified date: Feb 02, 2021
Observation date: Jul 14, 2020
Submitted by: stevecary
Region: Rio Arriba County, New Mexico, United States
Verified by: stevecary
Verified date: Nov 22, 2020
Observation date: Jul 28, 2019
Submitted by: A_baldini
Region: Larimer County, Colorado, United States
Verified by: A_baldini
Verified date: Feb 21, 2020
Observation date: Jul 01, 2015
Submitted by: ncrosbyrd
Region: Gunnison County, Colorado, United States
Verified by: A_baldini
Verified date: Aug 10, 2018
Observation date: Jun 28, 2018
Submitted by: taogirl
Region: Mesa County, Colorado, United States
Verified by: mikefisher
Verified date: Aug 10, 2018
Observation date: Aug 12, 2017
Submitted by: A_baldini
Region: Larimer County, Colorado, United States
Verified by: mikefisher
Verified date: Dec 26, 2017
Observation date: Jul 22, 2007
Submitted by: hjbarkey9
Region: Routt County, Colorado, United States
Verified by: mikefisher
Verified date: May 22, 2012
Observation date: Aug 29, 1995
Submitted by: Norbert Kondla
Region: Colorado, United States
Verified by: Norbert Kondla
Verified date: Feb 20, 2011
Observation date: Aug 07, 1990
Submitted by: Norbert Kondla
Region: Colorado, United States
Verified by: Norbert Kondla
Verified date: Feb 20, 2011
Observation date: Jul 28, 2007
Submitted by: stevecary
Region: Rio Arriba County, New Mexico, United States
Verified by: stevecary
Verified date: Feb 04, 2011
Observation date: Jul 23, 2010
Submitted by: legacy.reporter (Paul Opler and EviBuckner-Opler )
Region: Summit County, Colorado, United States
Verified by: paulopler (Paul Opler)
Verified date: Dec 31, 2010
Observation date: unknown
Submitted by: BAMONA
Region:
Verified by: BAMONA
Verified date: Sep 06, 2010
Observation date: unknown
Submitted by: legacy.reporter
Region: Garfield County, Colorado, United States
Verified by: legacy.verifier
Verified date: Dec 31, 2004
Observation date: unknown
Submitted by: legacy.reporter
Region: La Plata County, Colorado, United States
Verified by: legacy.verifier
Verified date: Dec 31, 2004
Observation date: unknown
Submitted by: legacy.reporter
Region: Custer County, Colorado, United States
Verified by: legacy.verifier
Verified date: Dec 31, 2004
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