PLATE I 



Fig. i. Catharacta skua lonnbergi (Mathews). Adults, Cumberland 

 Bay, South Georgia. 



Fig. 2. Catharacta skua lonnbergi (Mathews). Chick about ten days 

 old, South Georgia. 



Fig. 3. Catharacta skua, either lonnbergi (Mathews) or antarctica 

 (Lesson). Young chick, Port Lockroy, South Shetlands. 



