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Photo#178203
Feathered Antennae - Pterotus obscuripennis - male

Feathered Antennae - Pterotus obscuripennis - Male
Caspers Regional Park, San Juan Capistrano, Orange County, California, USA
April 20, 2008
Size: 3/4" from mouth to end.

Images of this individual: tag all
Feathered Antennae - Pterotus obscuripennis - male Feathered Antennae - Pterotus obscuripennis - male

I come up with
Pterotus (Lampyridae), and it looks very much like Pterotus obscuripennis , a male. There's a page for this in the guide, incl. a post from Sta Clara County, CA.
Also, as Ken suspected, Evans & Hogue's Field Guide (1) does have both a description, and a photo.

 
Thanks!
That looks to be it! Thank you very much.

 
Male.
This is the male. The females reach sexual maturity while retaining a larval appearance, hence "larviform female." She glows, he doesn't.

I'm pretty sure
I've seen this beetle in the Field Guide to CA Beetles, but I can't place it right now - someone will know this cool beetle...

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