Remsen, J.V. 1977 Philadelphia Vireo Vireo philadelphicus East Mojave Desert [cont] Oct.23 The back looked grayish in most views except in [cont] direct sunlight when a greenish cast was discernible, contrasting with a grayer crown. But unless the back was seen in sunlight or, it looked grayish. An inspection of Philadelphia-Warbling back color in MVZ recently showed that the back color differences were not as pronounced as field guide pictures show - many Warblings are greenish backed and Philadelphia only averages slightly greener. The bird was spotted by Doug Morton and identified simultaneously by Jon Dunn and myself. We watched the bird off and on for 10 minutes, including a 5 minute study at eye level and below in cottonwood saplings from as close as 10 ft. Also seen by Sid England, Linda Hale, Steve Cardiff, and Gregg Morton. An additional note - the wings were a uniform grayish except for a rather noticeable area on the upper wing coverts which was whitish, forming an indistinct wingbar. Oct.24 East Mojave Desert: 1- Kelso (same bird) - Post Office Oct.30 Monterey area, Monterey Co., Calif : 1 - Carmel Rivermouth ~ 1/2 way between Hwy 1 and green sewer pipe. - seen in this area yesterday by Rich Stallcup. Seen with Warbling Vireo for comparison - like Warbling but all yellow underneath from throat to undertail coverts except for whitish in center of belly; dark loreal line; back looked grayish like Warbling in our light (shade); smaller and shorter-billed than Warbling