Cogswell 1948 Sialia mexicana Nov. 7. 4 mi. W.S.W. of Palo Alto, San Mateo Co. Calif. Flock of 6 settled into top of oaks on ridge S. of San Francisquito Creek, many oak moths flying all about them were apparently not recognized as food -- and are apparently not taken by any bird according to John Barville, who has been studying the moth for years & is getting his M.A. on it at Stanford University. Another flock of 5 or 6 bluebirds, 1/2 mi. further to N. may have been the same ones.