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



Immature: Upper parts more grayish olive; wing bars, absent, or 

 only slightly indicated by dull whitish; sides obscurely streaked with 

 olive instead of black. 



Diagnostic characters for adults: Wing bars, yellow, and 'under 

 parts, including belly, yellow. 



Length, 4.65; wing, 2.15; tail, 2; bill, .36. 



The Prairie Warbler must be considered a rather rare bird in 

 Illinois and a rare straggler in Wisconsin. Mr. Isaac E. Hess writes 

 me he has taken it at Philo, Champaign Co., Illinois, and Mr. Ridgway 

 took a specimen at Mt. Carmel, 111. Mr. L. E. Wyman shot a male 

 at Riverside, near Chicago, on May 8, 1907 (The Auk, Vol. XXV, 1908, 

 p. 87), and another specimen, a female, was shot by Mr. John F. 

 Ferry on May 22, 1907, at Lake Forest, Illinois. Nelson considered 

 it "a very rare spring and summer visitant." But few specimens 

 have been taken in the vicinity of Chicago. Mr. Frank M. Woodruff 

 writes: "Mr. George Clingman informs me that he took a pair at 

 Bryn Mawr, Chicago, during the second week of June, 1878. He also 

 took a nest and eggs of this species at Forty-eighth Street and Vin- 

 cennes Ave., Chicago, on May 22, 1892." (Birds of the Chicago 

 Area, 1907, p. 169.) 



It has also been recorded as breeding by Mr. D. H. Eaton at 

 Peotone, Will County, Illinois (Forest and Stream, Vol. XI, Aug., 

 1878, p. 47); by Mr. A. H. Mundt at Fairbury, Livingston Co., 

 Illinois (Ornithologist and Oologist, Vol. VIII, Feb., 1883, p. 9), and 

 by Mr. W. E. Loucks at Peoria, Illinois (Oologist, 1891, p. 224). 



Dr. Hoy says: "A few are occasionally seen about the middle of 

 May. Rare in Wisconsin." (Proc. Acad. Nat. Sci. Phila., Vol. IV, 

 1853, p. 311.) Messrs. Kumlien and Hollister record a specimen 

 taken by Thure Kumlien at an early date at Lake Koshkonong. 

 (Birds of Wisconsin, 1903, p. 116.) 



The nest is built in a small tree or bush and is composed of plant 

 fiber, shreds of leaves, etc., and lined with plant down and hair. 

 The eggs are 4 or 5, white or buffy white, spotted with brown chiefly 

 around the larger end, and measure about .64 x .47 inches. 



