178 BIRDS OF THE PUBLIC GARDEN 



a singing male bird on the Common. In 

 three of the years it has first appeared on 

 May i6. In 1901 its coming was delayed 

 to May 22, and only two birds were noted 

 in that season. The last visitants have 

 usually passed on May 23 to 26, although in 

 1907 the migration extended to the end of 

 the month and one bird was present and 

 in song on May 30. Commonly the male 

 birds sing. 



On May 19, 1907, ten Wilson's Warblers 

 were present, male and female, and five or 

 six birds were recorded on the three days 

 following. On some days of the migration 

 period, which variously covers one to two 

 weeks, a single bird only has been recorded, 

 but there has been scarcely a day within 

 the period of each season when one or 

 several birds have not been present. This 

 warbler frequents the larger trees about the 

 pond, but may also be found in the groups 

 of shrubs or in the English hawthorns. 

 The black cap on the crown of the male 

 bird, allowing the yellow of the forehead to 

 show below it, is a distinguishing mark. 



