94 



with the two preceding species, frequent vacant lots and grounds con- 

 taining shrubbery in Chicago, in large numbers during the migrations. 



6. T. migratorius Linn. ROBIN. Common summer resident. 

 Arrives March 1st in large flocks. The resident birds commence 

 nesting April 15th, and all leave during October and the first part of 

 November. 



Genus Harporhynclms Cab. 



7. H. rufus Linn. BROWN THRUSH. Common summer resident. 

 Arrives April 20th, nests the middle of May, and departs in Septem- 

 ber. That the nest of this species is often placed in trees and bushes 

 for protection against some apparent clanger I have no doubt, but in 

 many cases this site is chosen from a mere whim of the bird. I have 

 found in one "scrub oak" grove, on a sandy ridge, some half dozen 

 nests for several seasons in succession, and each year about one-half 

 the nests were in the trees, and the remainder were built at the bases 

 of saplings or bushes, yet I could find no apparent cause for the loca- 

 tion of the nests in the trees. The young were in each case reared 

 with equal safety. 



Genus Mimus Boie. 



8. M. polyglottus L. MOCKING BIRD. A very rare summer 

 resident. I know of but few instances of its occurrence in the vicin- 

 ity of Chicago. Dr. Hoy has recorded six nests obtained in the 

 vicinity of Racine, Wisconsin. 



Genus Qaleoscoptes Caban. 



9. G. carolinensis L. CAT BIRD. Very common summer resi- 

 dent. Arrives May 1st; nests the middle of this month and departs 

 during September. 



Genus Myiadestes Cab. 



10. M. townsendi And. TOWNSEND'S THRUSH. A single spec- 

 imen of this species was obtained December 16, 1875, by Mr. Charles 

 Douglas, at Waukegan. The bird was found in a sheltered ravine, 

 extending a short distance into the bluff, bordering the lake shore 

 neuv the above named place, and showed no alarm when approached. 

 Nothing peculiar was observed concerning its habits except that its 

 movements were very sprightly. 



Family SAXICOLIDJE. 



Genus Sialia 8w. 



11. S. sialis Bd. BLUE BIRD. Arrives early in March and is 

 abundant, in flocks, until the first of May, when they commence 



