2 1 2 PASSERES : Perching Birds 



CASSIN VIREO 



(629a. Lanivireo solitarius cassini) 5| in. 



Upper parts gray; white below; back, wings, tail, and sides 

 greenish- washed; white eye-ring and lores a conspicuous and 

 distinctive marking. 



Song: A series of disconnected, warbled "phrases" of three 

 or four notes, uttered even more deliberately than that of the 

 Warbling Vireo. 



Habitually feeds among the larger branches of trees instead 

 of their twig-tips. 



PLUMBEOUS VIREO 



(629b. Lanivireo solitarius plumbeus) 5f in. 

 Like the Cassin Vireo in general appearance and habits; but 

 upper parts plumbeous-gray and sides washed with same color. 

 The white eye-ring and lores distinguish this Rocky Mountain 

 form as they do the Cassin on the Pacific slope. 



HUTTON VIREO 



(632. Vireo huttoni huttoni) 4f in. 



Dull olive-green above; lighter below, with yellowish wash, 

 and sides suffused with olive; two whitish wing-bars. 



A dull, inconspicuous, unattractive bird that is easily over- 

 looked except for its pleasing, whistled notes. 



Feeds habitually among the twig-tips, rather than " inside" 

 the tree, as does the Cassin Vireo. 



STEPHENS VIREO 



(632a. Vireo huttoni Stephens!) 5 in. 



A desert-mountain race of the Hutton Vireo, hence grayer 

 and paler; wing-bars pure white, broader and correspondingly 

 conspicuous. 



Habits and notes identical with the type form. 



