WHITE-WINGED BLACK TERN 



SILVER-WINGED BLACK TERN. 



PLATE CCXIX. 



Sterna kucoptera^ .... MEYER. 



Hydrochelidon leucoptera, . . . MACGILLIVRAY. 



THE eggs of this rare straggler, which is not now known 

 to breed in Great Britain, are three, or occasionally 

 four in number, the ground colour being dull yellowish-olive 

 or buff, with many greyish spots, and some larger blackish- 

 red ones. 



The male and female birds sit on the eggs in turn, and 

 show much anxiety for their safety, flying at and about all 

 intruders. 



150 



