342 DAVENPORT ACADEMY OF SCIENCES. 



climbing up to a Robin's nest which chanced to be near it. The 

 usual nesting date is about June 20 in northern Iowa. 



Subgenus Lanivireo Baird. 



284. (628). Vireo flavi/ro?is\\Q.\\\. Yellows-throated 'Vireo. 

 The Yellow-throated Vireo is reported as a tolerably common 



summer resident in most portions of the state, and rather rare in 

 others. It appears to be less common than either the Red-eyed 

 or Warbling Vireo, although its bright j'ellow breast makes it 

 conspicuous. It is a less pleasing singer than either of the pre- 

 ceding species, and has the habit of greeting the intruder into its 

 haunts with a peevish, scolding note, particularly if near the 

 nesting site. The only nest I ever found was at Forest City, 

 June 18, 1891, containing four eggs of the Vireo and one of the 

 Cowbird, suspended from a crotch about twenty feet up in a burr- 

 oak, composed of dried grass, cottony substances, thin pieces of 

 bark, moss, and nearly covered with small bits of newspaper, 

 lined with fine strips of reddish grapevine bark. The nest was 

 in the same tree with occupied nests of a Robin and a Mourning 

 Dove. An unusual nesting site was reported from Dallas county 

 by J. E. Law, in a hazel bush one foot up (Iowa Orn., ii, 2, 1896, 

 pp. 44-46). 



285. (629). Jlj'eo solitarius {W\\s.). Blue-headed Vireo. 



The Blue-headed Vireo is a regular migrant in Iowa during the 

 first two weeks of May. In the fall it remains for a longer time, 

 being more common during the middle of September, although I 

 took a specimen as early as August 24, 1901, at Forest City, and 

 Prof. C. C. Nutting took one as late as October 5, 1886, at Iowa 

 City. W. W. Cooke estimated that in 1884 the species moved 

 northward at the rate of more than eighty miles a day, the most 

 rapid speed among more than a hundred species whose rate of ad- 

 vance was calculated. The same rapidity of migration was noted 

 in 1885 (Bird Migr. in Miss. Val., 1884-85, pp. 235-36). 



The Blue-headed Vireo is quite generally distributed over low'a 

 during migration, visually keeping to the heavier woods. Esti- 

 mates as to its abundance are variable, it being considered toler- 

 ably common in many localities and rather rare in others. In 

 Winnebago county the Blue-headed Vireo is quite common and 



