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 582 verified sightings
Observation date: Jul 11, 2016
Submitted by: jorm
Region: San Mateo County, California, United States
Verified by: mcduck
Verified date: Aug 23, 2023
Observation date: Jun 24, 2023
Submitted by: bran9522
Region: Nevada County, California, United States
Verified by: mcduck
Verified date: Aug 09, 2023
Observation date: Jul 25, 2023
Submitted by: ckrepky
Region: Jackson County, Oregon, United States
Verified by: J_Martineau
Verified date: Jul 28, 2023
Observation date: May 17, 2023
Submitted by: flyinganvil
Region: Josephine County, Oregon, United States
Verified by: J_Martineau
Verified date: Jul 24, 2023
Observation date: Jun 23, 2023
Submitted by: Giudita13
Region: Pierce County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 18, 2023
Observation date: Jun 04, 2023
Submitted by: Stacey Terrill
Region: Missoula County, Montana, United States
Verified by: davidwdroppers
Verified date: Jun 07, 2023
Observation date: May 19, 2023
Submitted by: bobscafe
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Jun 04, 2023
Observation date: Jan 25, 2023
Submitted by: Desidoodles59
Region: Kern County, California, United States
Verified by: mcduck
Verified date: May 31, 2023
Observation date: May 30, 2023
Submitted by: LBisMe
Region: Tuolumne County, California, United States
Verified by: mcduck
Verified date: May 31, 2023
Observation date: May 26, 2023
Submitted by: Cidri
Region: Stevens County, Washington, United States
Verified by: davidwdroppers
Verified date: May 28, 2023
Observation date: May 18, 2023
Submitted by: OliveandFig
Region: Klickitat County, Washington, United States
Verified by: davidwdroppers
Verified date: May 19, 2023
Observation date: May 18, 2023
Submitted by: Cmeskee
Region: Chelan County, Washington, United States
Verified by: davidwdroppers
Verified date: May 19, 2023
Observation date: May 15, 2023
Submitted by: singingfalls
Region: Douglas County, Oregon, United States
Verified by: davidwdroppers
Verified date: May 15, 2023
Observation date: May 08, 2023
Submitted by: Jurfie
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: May 09, 2023
Observation date: Jan 07, 2018
Submitted by: Cfuller
Region: San Diego County, California, United States
Verified by: mcduck
Verified date: Nov 09, 2022
Observation date: Jan 16, 2018
Submitted by: Sillymeg11
Region: Orange County, California, United States
Verified by: mcduck
Verified date: Nov 09, 2022
Observation date: Feb 15, 2018
Submitted by: Carin Fredriksson
Region: Los Angeles County, California, United States
Verified by: mcduck
Verified date: Nov 09, 2022
Observation date: Mar 16, 2018
Submitted by: Lizardlou
Region: San Diego County, California, United States
Verified by: mcduck
Verified date: Nov 09, 2022
Observation date: Mar 19, 2018
Submitted by: CelestesMountainNest
Region: Los Angeles County, California, United States
Verified by: mcduck
Verified date: Nov 09, 2022
Observation date: Apr 14, 2018
Submitted by: Hukilau
Region: Alameda County, California, United States
Verified by: mcduck
Verified date: Nov 08, 2022
Observation date: Apr 24, 2018
Submitted by: Claudia578
Region: San Diego County, California, United States
Verified by: mcduck
Verified date: Nov 08, 2022
Observation date: May 03, 2018
Submitted by: j.boothman
Region: Santa Cruz County, California, United States
Verified by: mcduck
Verified date: Nov 08, 2022
Observation date: May 08, 2018
Submitted by: capepeirce
Region: Humboldt County, California, United States
Verified by: mcduck
Verified date: Nov 08, 2022
Observation date: May 12, 2018
Submitted by: Andreaparker
Region: Calaveras County, California, United States
Verified by: mcduck
Verified date: Nov 08, 2022
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