First county record for Santa Clara County, September 2005, and still the only sighting of this species in the county. I got only bad (distant and backlit) photographs of this bird -- and my field views were even less informative. But when I processed the digital images, the pictures turned out to give much better views. After checking my books, I thought the bird looked odd for Warbling, which is the expected vireo of this type in this area. The dark crown, dark lores, short bill, and yellow underparts are consistent with Philadelphia Vireo, and a number of expert birders thought that identification could be made firmly on the basis of these pictures. Efforts to refind the bird were not successful, so these photographs are the only record of this bird's presence in Santa Clara County.