Melissodes communis alopex - Melissodes communis -
Residence near Rosebowl, Pasadena, Los Angeles County, California, USA May 26, 2010
I've had this species in my garden for some years now. This year, the males chose to gather for the night on the seed pods of Sisyrinchium bellum.
Compare an earlier gathering (2006) on a dead twig of a sage: