THE BOOK OF MIGRATORY BIRDS l6l 



having the tips and margins of a lighter shade; flank 

 feathers tipped with white; vent, upper and under tail- 

 covers, the latter exceeding the tail in length, pure white ; 

 tail clove-brown ; quills and secondaries, blackish-brown ; 

 bill, legs, and feet black. 



The sexes do not vary much in plumage. 



