226 Trans. Acad. Sci. of St. Louis. 



1843. At the latter place the species was found common by 

 Dr. J. A. Allen in May 1871, and Dr. Hoy includes it in his Hst 

 of western Missouri birds. At St. Louis it is seldom found 

 before the middle of April (April 12, 1887), but generally in the 

 third week, i. e., between the loth and the 22nd. The bulk, 

 including the females, has come before the end of the month. 

 After the breeding season is over Blue Warblers become scarce, 

 apparently leaving their breeding grounds, but in Dunklin Co. 

 individuals have been found through September (September 

 28, 1897), and an exceptionally late date is reported from 

 New Haven, September 25, 1903, by Dr. Eimbeck. 



*659. Dendroica pensylvanica (Linn.). Chestnut-sided War- 

 bler. 



Sylvia pensylvanica. Sylvia icier ocephala. Sylvicola icterocephala. Yellow- 

 crowned Warbler. 



Geog. Dist. — Eastern United States and southern Canada, 

 north to Nova Scotia, northern Ontario and Manitoba; west to 

 eastern Nebraska and eastern Kansas. Breeds from the Alle- 

 ghany Mountains in South Carolina, from New Jersey, Pennsyl- 

 vania, Ohio, central Illinois, southern Missouri and eastern 

 Kansas northward and winters from Guatemala to Panama. 



In Missouri a fairly common transient visitant, less common 

 westward, where it was taken by Audubon, May 4, 1843, and by 

 Dr. J. A. Allen, May 1871, near Fort Leavenworth. Dr. Hoy 

 has it in his list, also Mr. Chas. W. Tindall of Independence. 

 Mr. S. S. Wilson gives it as rare at St. Joseph, where he took a 

 male, August 28, 1894. W. E. D. Scott has it as rare at Warrens- 

 burg, where he first noted it May 7, 1874. Though usually 

 fairly common in eastern Missouri it is somewhat irregular in 

 arriving; in some years the first are seen in the last week of 

 April (earliest April 23, 1885, and April 25, 1886, at Mt.Carmel; 

 April 26, 27 and 29, St. Louis); in other years not before the 

 second week in May (May 11, 1886), but most of the dates col- 

 lected at St. Louis as well as in the state generally are in the first 

 week of May. In favorable weather transients pass rapidly 

 through and disappear soon after the middle of May, but in cool 

 weather they have lingered through the third into the fourth 

 week (May 23, 1882; May 24, 1883; June 3, 1907). In fall 

 the species is one of the first migrants to return from farther 

 north, having been met with as early as August 24, 1896, and 



