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Photo#359322
California Diurnal Firefly - Ellychnia californica

California Diurnal Firefly - Ellychnia californica
MB05 Pond, Monte Bello Open Space Preserve, Santa Clara County, California, USA
May 22, 2009
Size: ~13 mm
I believe this is Ellychnia californica, which seems to be under-represented in BG images, given its relative abundance in the Bay Area. Here's another specimen from a neighboring county, one week earlier: