103 



dense ■willow thiclsct bordering Mazon Creek, about sixty miles south 

 of Cliicago. Upon my approach the birds showed great anxiely, 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 owhig to the char- 

 acter of the covert they were not found. Specimens of this species 

 may invariably — as far as my experience goes — be separated frona 

 those of V. gilvns by the greater intensity of yellow on the former, as 

 well as by the quill characters. 



72. V. gilvus Cass. Wakbling Vireo. A common summer res- 

 ident. Arrives May 8th to l."jth; departs in September. 



73. V. solitarius IM. Blue-headed Viheo. Au abundant mi- 

 grant; May olli to 25th, and the last of September and first of Octo- 

 ber. Found everywhere iu the woods and thickets. 



74. V. flavifrons Bd. YEi.LOW-TiinoArED Viueo. A common 

 migrant and not uncommon summer resident. May 8th to 24th, and 

 September 10th to October 15th. 



75. V. noveboracensis Bonap. White-eyed Viueo. Summer 

 resident. Kulher rare. Arrives the middle of May and departs the 

 first of October. Very common in Southern Illinois. 



76. V. belli And. Bell's Vhieo. A single specimen, obtained 

 near Chicago, June 23, 1875, is the only instance I have recorded of 

 its occurrence in this vicinity. It is a common summer resident on 

 the more southern prairies of the state. 



Family AMPELIDJBI. 

 Genus Ampelis Linn. 



77. A. garrulus Linn. Bohemian Waxwing. An irregular but 

 occasionally abundant winter resident, especially along the lake. Ar- 

 rives in December and sometimes remains until April. The winter 

 of 1875-C they were unusually numerous. In a letter dated March IG, 

 187G, Mr. Charles Douglas, of Waukcgau, describes an "immense" 

 flock of these birds which lie observed the day previous, upon the 

 lake shore near that town. Tiic birds were feeding upon the juniper 

 berries found there, and covered, according to Mr. Douglas's estima- 

 tion, an area at least ten rods square. "While feeding, those in the 

 rear were continually flying and alighting in advance, thus keeping 

 the flock moving so that it was difticult to overtake them. A few 

 days later the flock sepai-ated into numerous smaller ones and soon 

 departed for the north. 



78. A. eedrorum Scl. Cedar Biud. Common summer resident. 

 Arrives the last of February, breeds from the first of June until the 

 middle of July ; leave late in autumn. 



