VIREOS 395 



7. Darker, wing- bars narrower. California. 



huttoni, p. ;]91). 

 7'. Paler and g'rayer, wing bars broader. Texas and Arizona. 



Stephens!, p. :]99. 



6'. Wing bars tinged with yellow. Washington and Oreg-on, 



wintering in California obscurus. p. o99. 



Subgenus Vireosylva. 



Spurious primary if present decidedly shorter than tarsus ; wing without 

 light bands. 



624. Vireo olivaceus (Linn.). Red-eyed Vikeo. 



Adults. — Top of head gray, conspicuously bordered by white superciliary 

 and narrow black line ; blackish line through eye ; rest of 

 upper parts olive green ; wings without bands or spurioiis 

 primary ; under parts clear white. Young : similar, but back 

 brownish ash ; sides washed with brown. Length : 5.50-G.oO, 

 wing- about 3.10-3.30, tail 2.15-2.30, exposed culmen, .50- 

 .55. 



Distribution. — Breeds from the arctic regions south chiefly in the north- 

 eastern United States, but extending through Florida and to the Gulf of 

 Mexico ; west to Montana and Washington ; migrates to South Anierica. 



Xest. — Hung- rather low from a forked twig of a tree, made of strips 

 of birch and inner bark, dead leaves, and vegetable fibers, often patched 

 with bits of wasp nest and lined with pine needles, or stems and rootlets. 

 Eggs : 3 to 5, white, lightly specked with reddish brown, chiefly around 

 the larger end. 



Food. — Insects and small berries. 



The eastern red-eyed vireo is fouud occasionally in Colorado at the 

 ])ase of the foothills, and has been recorded as far west as British 

 Columbia. 



625. Vireo flavoviridis (Cass.). Yellow-green Vireo. 



Like olivaceus. but sides and flanks bright olive green, axillars and 

 under tail coverts sulphur vellow. Length : 0.25-0.75, wing 2.80-3.20. tail 

 2.05-2.50. 



Distribution. — Valley of the Lower Rio Grande in Texas, south to Soutli 

 America ; accidental in Quebec and at Riverside, California. 



627. Vireo gilvus (VieilL). Warkling Vireo. 



. Idulfs. — Upper parts olive ^rfl_y, grayest on head and most olive on riuni) 



and up])er tail coverts: white streal,' through eye: wings ;in<l 



tail dnsky brown, unmarked, wing with a well-developed sj)n 



rious primary ; sides of head ])ale brownish or bufly ; under 



^ l)arts wliite, shaded with olive yellow on sides. Young: top 



Fig. 4'.M». of head and bind neck pale grayisli buff; rest of upper parts 



buffy, wings with bntt'y bars; under parts pure white, except 



for vellowish tail coverts. Length: 5.(K)-5..")(), wing 2.05-2.05, tail 2.10- 



2.4(1,' bill from nostril .:'.()-.:'.2. depth at ba.se .1.5-.1S. 



l)istrihuti())i. — North Anierica in general from (ireat Slave Lake to 

 northern Mi-xico ; breeds throughout the greater part of this range. In 

 winter to southern Mexico. 



Xest. — Similar to that of the red-eye, but smoother and more eomj)act : 

 hung in trees, usually at a considerable height, in open ('oj)ses. .ilong b.tnks 



