YELLOW-GREEN VIREO 



I. Vireosylva flavoviridis flavoviridis Cassin 

 Yellow-green Vireo 



Sexes alike. Length 138 mm. (545 in.); 

 tail 53 mm. (2.10 in.). Top of head and hind- 

 neck gray; rest of upper parts olive green; an 

 indistinct line of light gray above the eye; chin, 

 throat, middle of chest, breast and abdomen 

 white; sides and under tail coverts yellow. No 

 wing bars. Iris red. 



01 



One of the commonest and most widely dis- 

 tributed birds in the Canal Zone. Its song, 

 which differs more in tone than character from 

 that of V. olivacea of the United States, is often to 

 be heard from the shade trees about habitations. 

 The brief phrases of which it consists, are slighter, 

 sharper pitched and less musical than those of 

 its northern relative. 



2. Vireosylva olivacea (Linnaeus) 

 Red-eyed Vireo 



Sexes alike. Length 135 mm. (5.30 in.); 

 tail 54 mm. (2.15 in.). Crown slate gray 

 bordered by black; below that a conspicuous 

 white line extending from the bill above and 

 behind eye; rest of the upper parts olive green; 

 under parts grayish white; no wing bars. Iris 

 red. Bill fairly slender, slightly curved at tip. 



A migrant. Much like Vireosylva f. flavo- 

 viridis in appearance, habits and notes, but 

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