These are hard to get down to species, but I can tell you it is a Longlegged Fly. Most likely in the Subfamily Sciapodinae. If that is so I'm taking a guess that in California it's probably Condylostylus longicornis
http://bugguide.net/node/view/146478
But see others here:
http://bugguide.net/node/view/12491/bgpage
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