Posted by mcduck on 07-12-2010 17:19
#1
My photo which as previously identified as Trupanea californica at http://www.diptera.info/photogallery.php?photo_id=2707, has been identified as Plaumannimyia flava by Allen Norrbom of the USDA, at http://bugguide.net/node/view/147200#836592.