634 Field Museum of Natural History — Zoology, Vol. IX. 



tinged with pale olive yellow, more especially on the sides; wings 

 and tail, slaty brown, more or less faintly edged with olive; first pri- 

 mary, very short, less than an inch long. 



Sexes similar. 



Length, 5.60; wing, 2.90; tail, 2.20; bill, .40. 



The Warbling Vireo is a common summer resident in suitable 

 localities in Illinois and Wisconsin, arriving in May and leaving for 

 the south in September. The song somewhat resembles that of the 

 Red-eyed Vireo but is sweeter and not so loud. 



The nest is pensile, usually attached to a forked branch of a tree. 

 The eggs are 3 to 4, pure white, with a few scattered spots of black 

 and brown chiefly at the larger end, and measure about .75 x .54 

 inches. 



Genus LANIVIREO Baird. 



296. Lanivireo flavifrons (Vieill.). 

 Yellow-throated Vireo. 



Vireo flavifrons Vieill., A. O. U. Check List, 1895, p. 264. 



Distr.: Breeds in United States and southern British Provinces, 

 from Texas, Kansas, the Dakotas, north to southern Manitoba, and 

 eastward to the Atlantic coast; south in winter to Cuba, Mexico, 

 Central America, and Colombia, S. A. 



Adult: Wing coverts, tipped with white, forming wing bars; 

 upper parts, olive green, shading to grayish on the ramp; eye ring, 

 yellow or yellowish; throat and breast, yellow; belly, white; inner 

 secondaries, edged with white. 



Sexes similar. 



Length, 5.80; wing, 3; tail, 2; bill, .38. 



A common migrant and not uncommon summer resident in 

 wooded districts in Illinois and Wisconsin, although apparently rather 

 rare in the vicinity of Chicago. It arrives from the south late in 

 April, and the majority have gone by October i. 



Mr. Frank M. Woodruff records a nest and eggs of this species 

 taken June 8, 1885, in Lake County, Illinois, by Mr. B. T. Gault. 



The nest is attached to the branch of a tree, usually in woods, and 

 is composed of grass, lichens, shreds of bark, and plant fibers. The 

 eggs are three or four, pure white, with a few scattered spots of black 

 and brown, chiefly at the larger end. Size, about .80 x .59 inches. 



