Ceraunus Blue
Hemiargus ceraunus (Fabricius, 1793)
Family: Lycaenidae
Subfamily: Polyommatinae
Identification: Upperside of male light blue with a darker narrow border; female dark brown, often with wing bases blue. Underside gray; both wings with a row of dark postmedian dashes. Florida butterflies have one submarginal eyespot on hindwing; Southwest butterflies have two.
Wing Span: 3/4 - 1 1/8 inches (2 - 3 cm).
Life History: Males patrol during warm hours of the day for receptive females. Eggs are laid singly on flower buds or leaves of host plant; caterpillars feed on flowers and seedpods.
Flight: Throughout the year in Texas and south Florida, late summer in other parts of its range.
Caterpillar Hosts: A variety of woody legumes including partridge pea (Cassia brachiata), mesquite (Prosopis species), and rosary pea (Abrus precatorius).
Adult Food: Flower nectar.
Habitat: Open woodland, desert scrub, dunes, pastures, road edges, and vacant lots.
Range: U. S. Southwest, South Texas, Florida and the Keys south through the West Indies, Mexico, and Central America to South America. Strays to North Carolina, Missouri, Kansas, and Nevada.
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 855 verified sightings
Observation date: Jul 23, 2025
Submitted by: J_Martineau
Region: Santa Cruz County, Arizona, United States
Verified by: J_Martineau
Verified date: Dec 15, 2025
Observation date: Nov 17, 2025
Submitted by: RexMundi
Region: Cameron County, Texas, United States
Verified by: jwileyrains
Verified date: Dec 08, 2025
Observation date: Dec 06, 2025
Submitted by: 4wildlife
Region: Orange County, Florida, United States
Verified by: John Calhoun
Verified date: Dec 07, 2025
Observation date: Dec 01, 2025
Submitted by: cjgoin
Region: Doña Ana County, New Mexico, United States
Verified by: stevecary
Verified date: Dec 02, 2025
Observation date: Nov 25, 2025
Submitted by: narwahl
Region: Texas, Kendall County, United States
Verified by: jwileyrains
Verified date: Nov 27, 2025
Observation date: Nov 25, 2025
Submitted by: cjgoin
Region: Doña Ana County, New Mexico, United States
Verified by: stevecary
Verified date: Nov 26, 2025
Observation date: Nov 10, 2025
Submitted by: cjgoin
Region: Doña Ana County, New Mexico, United States
Verified by: stevecary
Verified date: Nov 12, 2025
Observation date: Oct 20, 2025
Submitted by: ReggieGal
Region: Lake County, Florida, United States
Verified by: John Calhoun
Verified date: Oct 20, 2025
Observation date: Aug 16, 2024
Submitted by: Starlight
Region: Riverside County, California, United States
Verified by: Ken Davenport
Verified date: Aug 09, 2025
Observation date: Jul 04, 2025
Submitted by: KristyBaker
Region: Cameron County, Texas, United States
Verified by: jwileyrains
Verified date: Aug 03, 2025
Observation date: Jul 24, 2025
Submitted by: asombro_institute
Region: Doña Ana County, New Mexico, United States
Verified by: stevecary
Verified date: Jul 25, 2025
Observation date: Jul 08, 2025
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 09, 2025
Observation date: Jun 22, 2025
Submitted by: bentert
Region: Pima County, Arizona, United States
Verified by: John Saba
Verified date: Jul 03, 2025
Observation date: Jun 26, 2025
Submitted by: bentert
Region: Mohave County, Arizona, United States
Verified by: John Saba
Verified date: Jul 03, 2025
Observation date: Jun 24, 2025
Submitted by: Gordon Berman
Region: Doña Ana County, New Mexico, United States
Verified by: stevecary
Verified date: Jun 25, 2025
Observation date: Jun 16, 2025
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jun 17, 2025
Observation date: May 29, 2025
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: May 31, 2025
Observation date: Jan 25, 2025
Submitted by: hasfitz5
Region: Belize District, Belize
Verified by: Charlie Doggett
Verified date: May 19, 2025
Observation date: Jan 23, 2025
Submitted by: hasfitz5
Region: Orange Walk District, Belize
Verified by: Charlie Doggett
Verified date: May 19, 2025
Observation date: Jan 23, 2025
Submitted by: mtobin11
Region: Monroe County, Florida, United States
Verified by: John Calhoun
Verified date: Mar 21, 2025
Observation date: Feb 20, 2025
Submitted by: hiker96
Region: Miami-Dade County, Florida, United States
Verified by: John Calhoun
Verified date: Mar 03, 2025
Observation date: Feb 18, 2025
Submitted by: hiker96
Region: Monroe County, Florida, United States
Verified by: John Calhoun
Verified date: Mar 02, 2025
Observation date: Feb 07, 2025
Submitted by: Paul Prappas
Region: Belize District, Belize
Verified by: Paul Prappas
Verified date: Mar 01, 2025
Observation date: Feb 07, 2025
Submitted by: Paul Prappas
Region: Belize District, Belize
Verified by: Paul Prappas
Verified date: Feb 21, 2025
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