UNIVERSITY OF CALIFORNIA 



[GRINNELL-STORERI PLATE 50 





The Vireos of the Yosemite f-eetion. Photogiaphcd fioiu freshly taken 

 specimens, about % natural size. 



Cassin Vireo ; Pleasant Valley, May 23, 1915. 



Western Warbling Vireo; Pleasant Valley, May 23, 1915. 



Hutton Vireo; FA Portal, December 8, 1914. 



California Least Vireo; Snellino-, May 29, 1915. 



For ilisciissions of comparative fiehl characters, see jip. 509, 512, 513, .)14. 



