18(1 TiTi- ^^'lLsox Bulletin. No. 73-73. 



derbriish or berry bnslies. Woods of this character are not numer- 

 ous. Its associations are with the Wood Tlirush and tlie Oven-bird 

 in summer, and with the Hermit and Wood Thrushes in the spring 

 migrations. The median date of s]n'ing arrival is April 29, the 

 earliest record is April 20, 1890. 1 have no reliable fall records. 

 There has never been any fall movement noted. 



250. Eylocichla alidic- — Gray-cheeked Thrush. 



Prior to 1898 the problem of distinguishing this thrush from the 

 next had not been solved. Since that time it has been found fairly 

 ciiiiniiDn in the sjiring migrations, but irregular in the fall. It has 

 always been found associated with the next species, and the gen- 

 eral remarks will lie giA'en under that heading. The median date 

 of spring arrival for seven years is May 2, and of departure. Ma.v 

 19. Fall records indicate that it returns near the first week of 

 September and remains a month. 



251. Hylocichla f<ic(iiiisonii. — Olive-backed Thrush. 



This is decidedl.v the most numerous of the thrushes in the migra- 

 tions, both spring and fall. Probably because of its numbers it is 

 to be found anywhere that trees grow. The Cedar Point sand spit 

 sems to be a line of migration in spring, and my few experiences 

 on the chain of islands indicate that the island route is abundantly 

 patronized in the fall. The song of this thrush is heard in town, 

 parks, and door-yards during the stress of the migration, where 

 the birds often swarm in the tree-tops and among the shrubbery. 

 On the sand spit the.v are everywhere, and during the migration 

 of t!'e Sharp-shinned Hawks, suffer from the depredations of this 

 hawlv greatly. 'I'he median date of migration is, for the northward 

 movement. April :\0, the earliest lieing April 13, 190S: for the de- 

 parture north. j\Iay 25. the latest being June 13, 1905. The me- 

 dia)! (late of return in the fall is September 13, and the departure 

 southward October 4, the latest being October 24. 1S9(>. They usu- 

 ally remain common up to the day of their departure, both spring 

 and fair. On the day of my arrival on Pelee island, August 29. 

 there were none found, nor any the next da.v in spite of a careful 

 search, itut with the first faint dawn of the 31st tiie ]teculiar notes 

 of this bird were heard, and the full light revealed hundreds of 

 them in the bushes and everywhere in the woods. They remained 

 tlin-< nuii'c-r:n< until I'v (Ippartiirc the evening ul' tlie next day. 

 and were conunon on Middle and Kelley's islands. 



