YELLOW-THROATED VIREO 



with a more conspicuous line over the eye and 

 no yellow tinge on the under parts. 



3. Lanivireo flavifrons (Vieillot) 

 Yellow-throated Vireo 



Sexes alike. Length 126 mm. (4.95 in.); 

 tail 49 mm. (2.00 in.). Bright olive green 

 above changing to gray on rump and upper 

 tail coverts; a yellow ring around eye extending 

 to almost meet that of opposite side on forehead; 

 two distinct white wing bars; chin, chest, and 

 breast bright yellow, changing to grayish white 

 on abdomen. 



A migrant. 



4. Pachysylvia decurtata (Bonaparte) 

 Gray-headed Pachysylvia 



Sexes alike. Length 96 mm. (3.80 in.); 

 tail 36 mm. (1.40 in.). Head and hindneck 

 gray, the rest of the upper parts yellowish olive 

 green; eye-ring dull white; chin and throat 

 ashy white; middle of chest and breast and 

 abdomen white; sides light olive yellow. No 

 wing bars. 



The smallest and shortest-tailed of the Canal 

 Zone vireos and one of the common and widely 

 distributed birds, frequenting the brush and 

 undergrowth as well as the tallest trees of the 

 forest. 



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