Jan., 1909. Birds of Illinois and Wisconsin — Cory. 633 



with a few scattered spots of black or dark brown, and measure about 

 .82 X .56 inches. 



The song of the Red-eyed Vireo is a melodious 'and often-repeated 

 warble. 



294. Vireosylva philadelphica Cass. 



Philadelphia Vireo. 



Vireo philadelphicus (Cass.), A. O. U. Check List, 1895, p. 263. 



Distr.: United States and British Provinces, from Kansas, the 

 Dakotas, and Athabaska eastward, breeding from the northern edge 

 of the United States northward and occasionally farther south. 



Adults: Upper parts, grayish olive, the crown, slightly grayer 

 than back; a pale line over the eye; wings and tail, slaty brown, 

 faintly edged with olive green; under parts, pale greenish yellow; 

 chin and belly, often whitish; first primary as long or longer than 

 fifth. 



Sexes similar. 



Length, 4.70; wing, 2.55; tail, 2; bill, .36. 



A rather common migrant in Illinois and Wisconsin, but owing 

 to its plain colors often overlooked. It has not as yet been found 

 nesting within our limits, but may do so in northern Wisconsin and 

 perhaps farther south. 



Mr. E. W. Nelson found it abundant in the vicinity of Waukegan. 

 He says: "They were so numerous near Waukegan about the twen- 

 tieth of May, 1876, that a dozen specimens might have been obtained 

 in an hour. The first of July, 1874, I found two pairs of these birds 

 in a dense thicket bordering Mazon Creek about 60 miles south of 

 Chicago. Upon my approach the birds showed great anxiety, utter- 

 ing a short, complaining cry and coming within a few feet of me. 

 That they had young in the vicinity I was sure, but owing to the 

 character of the covert they were not found." (Birds of N. E. 111., 

 1876, p. 102.) 



295. Vireosylva gilva (Vieill.). 

 Warbli.ng Vireo. 



Vireo gilvus (Vieill.), A. O. U. Check List, 1895, P- 264. 



Distr.: United States and British Provinces east of the Rocky 

 Mountains, from Kansas, Wyoming, Montana, and Saskatchewan 

 eastward to the Atlantic coast, breeding throughout its range, except 

 in southern Florida. 



Adult: Upper parts, ash-gray, faintly tinged with olive; no white 

 bars on wings; throat, whitish; rest of under parts, whitish, faintly 



