NON-INDIGENOUS BRITISH BIRDS. 333 



bation is performed by both sexes, and lasts about 

 sixteen days. 



Diagnostic characters : I know of no character 

 by which the eggs of the Eastern Turtle Dove can be 

 distinguished from those of allied races and species. 

 Locality is of some service in their identification, but 

 great care is necessary, and the parents should be seen. 

 It may be remarked that the eggs of the Common 

 Turtle Dove are creamy-white, not pure white, as in the 

 present species. 



