Subject: Red and black beetle on coast live oak
Location: San Luis Obispo, CA
September 1, 2013 12:09 pm
Found this large beetle investigating the trunk on a coast live oak at the San Luis Obispo Botanic Garden.
Signature: Linda Eremita
Ha, I figured it out. It’s the adult California Glowworm.
Though California Glowworm is the common name for Ellychnia californica, this beetle is actually a Diurnal Firefly. We believe this is the first image of an adult California Glowworm posted to our site. According to BugGuide it is found: “Throughout CA, but seems to be more common from Sacramento south to the San Bernardino Mountains” and the habitat it favors is “on flowers and grassy vegetation, esp. in moist habitats.” We sometimes get images of Glowworms from California, but these glowing larvae are in the family Phengodidae.