Ceanothus silkmoth
Hyalophora euryalus (Boisduval, 1855)
Family: Saturniidae
Subfamily: Saturniinae
Identification: Wings are red to brownish red. Areas outside the narrow white postmedian lines are also red to brownish red, but may have black overscaling. Cell spot on the hindwing is shaped like an elongated comma and touches or breaks the postmedian line.
Wing Span: 3.5 - 5 inches (8.9 - 12.7 cm).
Life History: Females glue eggs singly or in clumps on leaves of the host plant. The eggs hatch in 9-14 days and the caterpillars eat leaves. The cocoon is spun in the outer part of the host plant and is attached to a twig by only one-half its length.
Flight: One brood from January-July depending on altitude and seasonal variation.
Caterpillar Hosts: A wide range of plants including buckbrush (Ceanothus), manzanita (Arctostaphylos), gooseberry (Ribes), madrone (Arbutus menziesii), willows (Salix), alder (Alnus), and mountain mahogany (Cercocarpus betuloides).
Adult Food: Adults do not feed.
Habitat: A wide variety of habitats including coastal areas, chaparral, and conifer forests.
Range: British Columbia east to western Montana, south through Washington, western Oregon, and California to Baja California Sur.
Conservation: Not usually required.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management Needs: None reported.
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Verified Sightings
Displaying 1 - 24 of 622 verified sightings
Observation date: Mar 29, 2025
Submitted by: sjbosso
Region: San Mateo County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Feb 12, 2025
Submitted by: hannahw
Region: San Diego County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Aug 24, 2020
Submitted by: Chris415
Region: San Mateo County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Mar 10, 2024
Submitted by: auntieles
Region: Marin County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Feb 13, 2024
Submitted by: Mr.DeAlva
Region: San Diego County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Apr 18, 2021
Submitted by: fogh8tr@gmail.com
Region: San Luis Obispo County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Apr 21, 2017
Submitted by: Sean Carlisle
Region: El Dorado County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Apr 19, 2021
Submitted by: JamG
Region: El Dorado County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Apr 21, 2021
Submitted by: SandraSchmidt
Region: Mendocino County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Apr 28, 2021
Submitted by: mothanetzky
Region: Santa Cruz County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Feb 12, 2021
Submitted by: syounger
Region: San Diego County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Apr 01, 2021
Submitted by: gdoud80
Region: San Diego County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Jan 07, 2021
Submitted by: skopfman
Region: Orange County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Mar 26, 2021
Submitted by: AstralDan
Region: Santa Cruz County, California, United States
Verified by: curtis.lehman
Verified date: Mar 17, 2026
Observation date: Mar 09, 2026
Submitted by: Mollykmo
Region: Santa Cruz County, California, United States
Verified by: jwileyrains
Verified date: Mar 09, 2026
Observation date: Mar 08, 2026
Submitted by: ldianal
Region: Alameda County, California, United States
Verified by: jwileyrains
Verified date: Mar 09, 2026
Observation date: Mar 30, 2017
Submitted by: NightPrancer
Region: Marin County, California, United States
Verified by: curtis.lehman
Verified date: Oct 21, 2025
Observation date: Mar 30, 2017
Submitted by: Mikazo
Region: Marin County, California, United States
Verified by: curtis.lehman
Verified date: Oct 21, 2025
Observation date: Feb 16, 2017
Submitted by: dammaged
Region: Orange County, California, United States
Verified by: curtis.lehman
Verified date: Oct 20, 2025
Observation date: Jun 15, 2025
Submitted by: Regal5647
Region: Multnomah County, Oregon, United States
Verified by: J_Martineau
Verified date: Jul 08, 2025
Observation date: Jun 12, 2025
Submitted by: bobscafe
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Jun 15, 2025
Observation date: Jun 11, 2025
Submitted by: bobscafe
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Jun 12, 2025
Observation date: May 02, 2025
Submitted by: lonesome55dove
Region: Klickitat County, Washington, United States
Verified by: davidwdroppers
Verified date: Jun 08, 2025
Observation date: May 05, 2025
Submitted by: bobscafe
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: May 21, 2025
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