PIED WAGTAIL. 



427 



from the point to the more dilated base, and that while our 

 pied bird changes on the back from ash-grey to black in the 

 breeding-season, the back of the white bird remains as 

 light in colour as it is in winter; even the back of the 

 female of our pied bird changes, and is decidedly much 

 darker in summer than the back of the White Wagtail at 

 the same season. 



The vignette represents the appearance of the Pied Wag- 

 tail in summer and winter. 



