Poanes melane (W. H. Edwards, 1869), Golden Gate Park, San Francisco, CA, 17 June 2013
Best fit I can find that should be in the area.
San Diego County, California, US
A skipper is a butterfly of the family Hesperiidae, and superfamily Hesperioidea (there is only one family in this superfamily). They are named after their quick, darting flight habits. There are more than 3500 recognized species of skippers and they occur worldwide, but with the greatest diversity occurring in the tropical regions of Central and South America.