l62 THE CHICAGO ACADEMY OF SCIENCES. 



breeds from the northern United States northward and south- 

 ward in the Alleghanies to Pennsylvania, and it winters from 

 the Bahamas and Mexico south to the West Indies and Panama. 



Dendroica rara (Wilson). Cerulean Warbler. 



Sylvia ccerulea Wilson, Amer. Om., II, 1810, 141, pi. 17, fig. 5. 

 Sylvia rara WILSON, Amer. Orn., Ill, 1811, 119, pi. 27, fig. 2. 

 Dendroica ccerulea Baibd, Rep. Pacific R. R. Surv., IX, 1858, 280. 

 Dendroica rara Ridbwat, Auk, XIV, 1897, 97. 

 Popular synonyms: Blue Waebler. Azuee Wabbleb. Whitb- 



THEOATED WABBLES. 



The Cerulean Warbler is a rare summer resident in the heavy 

 timber of DuPage County, Illinois, and a few probably breed 

 in the woods bordering the Desplaines River at ' River Forest. 

 Mr. B. T. Gault has observed this species during the summer 

 months in DuPage County and at Lake Forest, Illinois. It ar- 

 rives from about the tenth to the twentieth of May, and departs 

 early in Sepember. Mr. H. K. Coale informs me that he shot 

 a male Cerulean Warbler at Winnetka, Illinois, on May 12, 1879, 

 and that he also found them breeding in woods seven miles west 

 of Lake Forest, Illinois, in 1876. 



The range of the Cerulean Warbler covers the eastern United 

 States, east of the Rocky Mountains and chiefly west of the 

 Alleghanies, and from southern Canada southward, in winter, 

 to Central America and northern South America. It breeds from 

 about the latitude of 35" northward, especially in the heavily 

 wooded districts of the Mississippi Valley. 



Dendroica pensylvanica (Linnaeus) . Chestnut-sided Warbler. 



Motacilla pensylvanica LlNN^ns, S. N., ed. 12, I, 1766, 333. 

 Sylvia icterocephala Latham, Ind. Orn., II, 1790, 538. 

 Sylvicola icterocephala Jabdine, ed. Wilson's Amer. Om., I, 1832, 248. 

 Dendroica pensylvanica Baibd, Kep. Pacific R. R. Surv., IX, 1858, 

 279. 



At the present time thll Chestnut-sided Warbler is an abun- 

 dant migrant, arriving in the spring during the month of May, 

 and returning in the fall from about the ninth of September to 

 the third of October. In his list of the birds of Cook County, Illi- 

 nois,* Mr. Robert Kennicott includes this species with the no- 

 tation "Abundant," and also states that, at that time, it was 

 known to breed in the county. In his Birds of Northeastern lUi- 



*Trans. Illinois State Agri. Society, Vol. I, I853-I854, 583. 



