324 OHIO EXPERIMENT STATION. 



143. Helminthophila peregrina (WILS .) 

 Tennessee Warbler. 



A spring and fall transient ; tolerably common, though somewhat irregular. It 

 has been observed in spring between May 15 and May 24; in fall from September 21 

 to October 7. It was most numerous during the spring of 1892. It frequents thick- 

 ets and woodlands generally, being found often in company with other Warblers.. 

 Its song is heard quite regularly during the spring migration. 



GENUS DENDROICA GRAY. 



SUBGENUS PERISSOGLOSSA BAIRD. 



144. Dendroica tigrina (GMEL.). 

 Cape May Warbler. 



A transient visitor ; apparently rare in spring, but tolerably common in the fall, - 

 though of rather local occurrence. In the spring it has been only once seen, on 

 May 6, 1892; but in the autumn it has been observed from September 25 to October 

 7. It appears to somewhat prefer the lowlands, and has been chiefly noted in the 

 valley of the Killbuck, usually near the stream, in thickets and the less heavily ' 

 wooded portions of the forests. 



SUBGENUS DENDROICA GRAY. 



145. Dendroica aestiva (GMEL.). 

 Yellow Warbler. 



An abundant summer resident. Its spring arrival has been usually between- 

 April 21 and April 25, and it generally remains until September, not, however, 

 having been noted later than the seventh of this month. It is apparently more 

 numerous on the bottoms than on the uplands. 



Thickets along streams seem to furnish the most acceptable nesting sites, and in 

 this locality a decided preference is shown for the elders (Sambucus Canadensis}^ 

 much the greater number of nests found being situated in these bushes. 



The three eggs of a set (containing also one egg of the Cowbird) taken May 29, 

 1891, are somewhat peculiar in pattern of coloration, and exhibit considerable differ- 

 ence in size. The ground color is greenish white ; in one of the eggs almost immac- 

 ulate, with near the larger end a very few minute dots of clove brown and dull lilac 

 and one long streak of clove brown. A second egg is similar to the one described, 

 but is slightly more heavily marked, though much less so than is usual in eggs of the 

 species. The other egg is thickly marked, but still somewhat less so than average 

 specimens with small spots of fawn color, drab and dull lilac, these being in a broad 

 zone about the central portion of the egg. These eggs measure respectively : .70 x 

 .52, .71 x .52, .62 x .44. 



The height of the breeding season is apparently between the middle of May and . 

 the first of June, as a large proportion of the nests found contained, or evidently had 

 contained, unincubated eggs during this period. Incompleted nests have been ndtedi 

 by May n (1890), and eggs have been found as late as June 22 (1891). 



