EXPr,AN,VTION OF THE PLA lES. 251 



Fi£ 



h-k 



Plate XY. 



Plate XVI. 



Fig. ] . Egg of Larus maculipennis. 



2. „ „ glaucodes. 



3. ,, Creagrus furcatus. 



4. „ Larus hemprichi. 



5. ,, „ cirrhocephalus. 



