J 36 Wood and Tinker, Rarer Birds of Michigan. \au^\ 



year he was not able to locate one, although the same territory was 

 thoroughly searched. In 1908, the species appeared to have 

 returned in some numbers, as it was recorded on INIay 16, and on 

 May 24 a number were found in full song, in a heavy swamp about 

 seven miles west of Ann Arbor. The spring of 1909 fovmd the 

 species present, but only in limited numbers. On July 20, 1909, 

 F. Novy took an immature bird near here, a few others being noted 

 at the same time. In all probability the decrease in the number 

 observed may be attributed to the destruction of the heavier timber 

 which apparently forms a prominent factor in the environmental 

 conditions preferred by this warbler. 



Dendroica castanea. Bay-breasted Warbler. — Covert con- 

 sidered the Bay-breasted Warbler as not very common, but in recent 

 years it seems to be fairly common during the migrations, especially 

 in the fall. Our earliest spring record is that of INIay 3, 1905, and 

 one was taken as late as June 6 (1908). In the fall it has been taken 

 here as early as September 5 (1 896) and as late as September 30 (1905) . 

 In 1907, the species was quite common, first making its appearance 

 on May 13, and remaining until June 6. As a general thing the 

 males appear to be more abundant in the spring than the females, 

 while in the fall the immature birds form the bulk of the migrants. 

 In 1908, the Bay-breasted was quite common during both spring 

 and fall, but especially in the fall, when they were the most abundant 

 species present from September 27 to October 1. In the spring and 

 fall of 1909, the species was not as common as in the previous year. 



Dendroica striata. Bi>ArK-POLL Warbler.— Covert says of 

 the Black-poll, "The last of our warblers to arrive in spring, when 

 it comes in immense numbers." We have never found it common 

 at any time, and it is only occasionally that the species is present in 

 any numbers. In the spring of 1907, Black-polls came May 16, 

 and were unusually common, remaining until June 6. Our earliest 

 spring record is May 13 (1904) and the latest June 6 (1907). The 

 spring of 1908 found the species fairly common, especially on May 18 

 when a number were observed, and they were with us from May 16 

 to 25. In the fall of that year they were even more abundant, being 

 noted from September 9 to October 7, and in considerable numbers 

 on September 27. 



Dendroica dominica albilora. Sycamore Warbler. — In 1881, 



