189 



Nesting. Suspended from a branch about 8 feet from the ground in pensile nest of 

 fibres and birch bark. 



Distribution. Eastern America. More northern in breeding range than the Warbling 

 and only a migrant in most of the settled sections of Canada. 



Usually a rather rare little Vireo and too inconspicuous to be often 

 seen or recognized by the ordinary observer. 



627. Warbling Vireo. fr. — lb vireo gris-olive. Vireosylva gilva. L, 5-80. 

 Plate XXXIX A. 



Distinctions. The even unmarked coloration and small size will distinguish the 

 Warbling from any other Vireo except the Philadelphia. The lack of yellow overwash in 

 front and below will usually be diagnostic. The final test of the species, however, is the 

 email rudimentary condition of the first primary which is hardly three-quarters of an inch 

 long instead of one and three-quarters. 



Field Marks. The almost piu"e white underparts instead of the yellow suffusion of 

 the Philadelphia makes the best recognition mark from that species and the small size and 

 dull even coloration from other Vireos. 



Nesting. Suspended between the forks of a small branch 15 to 50 feet above the ground 

 in pensile nest of fine bark strips and plant fibres, smoothly and firmly interwoven and 

 lined with pine needles and hairs. 



Distribution. As a species, occupies all of temperate America; the Eastern Warbling 

 Vireo extends west to the prairie provinces. 



SUBSPECIES. The Warbling Vireo is divided into an eastern and a western sub- 

 epecies. The Eastern Warbling Vireo V. g. gilva, the type of the species, is the only one 

 met with in eastern Canada. 



The Warbling Vireo, hidden in leafy tree tops, is more often heard 

 than seen. Its song is very different from that of the Red-eyed, being 

 continuous and not composed of disconnected phrases. 



628. Yellow- throated Vireo. fr. — le vireo X front jatjne. Lanivireo flavifrons. 

 L, 5 95. Head, cheeks, and back greenish; rump and tail slaty; breast and thi'oat bright 

 yellow; below white; wings with two distinct white bars. 



Distindions. The bright yellow breast and throat of this species is distinctive. The 

 Solitary and the White-eyed are the only other Vireos with wing bars. In the former the 

 bars are white as in the breast, in the latter the bars are yellowish. In coloration the Yellow- 

 throated Vireo is very similar to the Pine Warbler, but there is much less white on the under- 

 parts of the latter species, the yellow suffusing and covering most of it instead of stopping 

 almost sharply at the breast line. 



Field Marks. The bright yellow throat and breast are distinctly recognizable and 

 prevent confusion with any other native Vireo. The voice, similar to that of the Red- 

 eyed but with the phrases following each other less rapidly 2 to 3 seconds apart instead of 

 about one per second, will distinguish it from others of its family or from the Warblers. 



Nesting. Suspended from a forked branch 10 to 80 feet above the ground, in pensile 

 nest of strips of bark, plant fibres, etc., lined with fine grasses and covered externally with 

 lichens, spider webs, etc. 



Distribution. Eastern North America. Common in eastern Canada only in the 

 southern parts of the lower Great Lakes region. 



A woodland and orchard bird. Besides its characteristic song it is a 

 maker of many queer noises and has an extensive vocabulary. 



629. Solitary Vireo. blue-headed vireo. fr. — le vireo a tIitb bleue. 

 Lanivireo solitariiis. L, 5 61. Back greenish shading into bluish ash on head and adjacent 

 parts of cheeks; white loral spot and white ring about eye; all underparts white with suffu- 

 sion of yellow on flanks; wings with two whitish bars. 



Distinctions. The ashy blue head with conspicuous white lores and eye-ring are 

 distinctive. 



Field Marks. The bluish head with conspicuous white eye-ring and lores and pure 

 white throat make conspicuous field marks. 



Nesting. Suspended from between the forks of a small branch 5 to 10 feet above the 

 giound, in pensile nest of wood fibres, bark strips, and pine needles, plant down, etc. 



57172—13* 



