EXPLANATION OP PLATE XX. 



Fig. 1. Laeus PACiricus, Latham. 

 Pacific Gull. 



Pig. 2. H^MATOPTTS UNICOLOB, WagUr. 

 Sooty Oyster-oatoter. 



Pig. 3. Sylochblidon caspia, Pallas. 

 Caspian Tern. 



Pig. 4. Xema Novai-HOLLANDia;, Stephen. 

 Jameson's Gull. 



