ANDERSON — THE BIRDS OF IOWA. 353 



though it has been rarely taken in eastern Kansas and Nebraska. 

 It usually migrates during the second and third weeks of May 

 and from the last week in August to the middle of September, 

 although specimens have been taken as early as April i8 (John- 

 son county) and October 5 (Scott). It is a rapid migrant in spring. 

 Cooke gives the average rate of advance through the Mississippi 

 Valley in 1883 as thirty-five miles a day, and in 1884 as thirty- 

 two miles. It is an active fl3'-catching species, usually appearing 

 after the green leaves of the forest are out. 



302. (658). Dcndroica ceruica (Wils.). Cerulean Warbler. 



The Cerulean Warl:)ler is a tolerably common migrant and a 

 rather rare summer resident in most parts of the state, but is 

 seldom seen on account of its shyness and its habit of keeping to 

 tops of the tallest trees, where the nest is placed on a horizontal 

 limb, 20-5Q feet from the ground. Dr. J. A. Allen found the spe- 

 cies quite common at Boonesboro, 1868, where it was the only 

 woodland Dcndroica observed (Mem. Bost. Soc, i, 1868, p. 494). 

 I never observed the species in Winnebago or Hancock counties, 

 but W. H. Binganian reports it as a rare summer resident in Kos- 

 suth county, northern Iowa. 



303. (659). Dcndroica pe)isylvanica{l^mn.) . Chestnut-sided War- 



bler. 



The Chestnut-sided Warbler is an abundant migrant, May i- 

 June I, and September 9-23, in all parts of the state, and breeds 

 in many localities, but is rather locally distributed in summer. 



County records — (breeding): Blackhawk — "breeds sparingly 

 in Blackhawk, Linn and Tama counties" (Peck). Henry — "sum- 

 mer resident" (D.I,. Savage). Franklin — "common summer resi- 

 dent" (Shoemaker). Jackson — "common migrant; rare breeder; 

 saw a female feeding a young Cowbird, July i, 1^94" (Giddings). 

 Lee — "abundant migrant; rare summer resident; see one or more 

 individuals every summer near certain thickets. Maj- 29, 1898, 

 found a nest in a clump of Indian currents containing one egg. 

 Another time, near the same place, saw a female building in a 

 clump of hazel" (Currier). Linn — "fairly common summer resi- 

 dent" (Keyes, Berry). Mahaska — "abundant; many breed" 

 (Trippe, Proc. Bost. Soc, xv, 1872, p. 235). Pottawattamie — "I 

 have a set of two eggs of this species taken in Pottawattamie 



