THRUSHES 131 



Range. Nests north of the United States. Bicknell's Thrash 

 (H. a. bicknelli) a slightly smaller, southern form, nests in the 

 higher parts of the Catskills, the mountains of northern New 

 York and northern New England, and northward and eastward 

 into Canada; both visit us in migration and both winter in the 

 tropics. 



Washington, rather common T. V., May 8-31 ; Sept. 15-Oct. 20. 

 Ossining, tolerably common T. V., May 15-June 1; Sept. 20— 

 Oct. 17. Cambridge, uncommon T. V., May 18-28; Sept. 15- 

 Oct. 9. N. Ohio, not common T. V., Apl. 29-May 23. Glen 

 Ellyn, common T. V., May i-June 4; Aug. 26-Oct. 9. SE. 

 Minn., common T. V., May 7-; Sept. 8. 



The Gray-cheeked and Bicknell's Thrushes are merely 

 the larger northern and smaller southern forms, respec- 

 tively, of the same species. They are known in the 

 United States chiefly as migrants and can be distinguished 

 with certainty in life only by an expert under favorable 

 conditions. The larger form is the commoner. The spe- 

 cies may be known from the Veery and Wood Thrush by 

 its olive, instead of cinnamon-brown back, and from the 

 Olive-backed Thrush by its whitish eye-ring and paler 

 breast. 



Brewster describes the song of the southern form 

 (Bicknell's Thrush) as exceedingly like that of the Veery 

 but more interrupted, while the ordinary call-note is 

 practically identical with the pheu of the Veery. The nest 

 is placed in low trees or bushes. The eggs are greenish 

 blue spotted with brown. 



OLIVE-BACKED THRUSH 



Hylocichla ustulata swainsoni. Case 8, Fig. 81 



Upperparts uniform olive; eye-ring buff; breast and sides of 

 the throat deeper than in the Gray-cheeked Thrush. L. 7 J. 



Range. Nests from northern Michigan and northern New Eng- 

 land northward into Canada and southward in the mountains to 

 West Virginia; winters in the tropics. 



Washington, common T. V., Apl. 19- June 2; Sept. 2-Nov. 1. 

 Ossining, tolerably common T. V., May 2-30; Sept. 19-Oct. 22. 

 Cambridge, common T. V., May 12-28; Sept. 15-Oct. 5. N. 

 Ohio, common T. V., Apl. 22-June 13; Sept. a-Oct. 24. Glen 



