Remsen, J.V. 1977 Philadelphia Vireo Vireo philadelphicus Pt. Reyes [cont] Sept. 28 and breast was solid bright yellow, brightest on center of chest-lower throat; the yellow became paler towards the belly and it appeared that the center of belly, especially between the legs was whitish, not yellow; the flanks were a dull yellow; the undertail coverts were fairly bright yellow. Behavior: foraged slowly and deliberately through undergrowth but did occasionally sally to foliage and hover-gleaned once. Voice: Silent. Legs: appeared bright blue The combination of black loral line, green back contrasting with gray crown, and bright yellow throat and breast eliminates Warbling or Red-eyed Vireo. The thick, hooked bill and bright yellow undertail coverts eliminates Tennessee Warbler (which looked more like this bird in general than does a Warbling Vireo). Oct. 23 East Mojave Desert, San Bernardino Co., Calif: 1 at Kelso in trees around Post Office. Size and shape of Warbling Vireo (but perhaps somewhat chunkier and shorter-billed) but including undertail coverts underparts almost entirely yellow, with only some whitish in center of belly. The yellow was brightest in the center of breast, but not as strikingly so as in the bird seen on Pt. Reyes Sept. 28 - underparts were more evenly yellow. Face similar to Warbling but black between eye and bill.