GEN. 280-231 OF KEY. 103 



540. STERCORARIUS POMATORHINUS (TKMM.) LAWR. 



Pomarine Jaegrer. 



541. STERCOKARIUS PARASITICUS (BRUNN.) GRAY. 



Jaegrer. 



542. STERCORARIUS BUFFONI (BOIE) COUES. 

 Arctic Jaeg-er ; l.ong--tailed Jaegrer. 



543. LARUS GLAUCUS BRUNN. 



Glaucous Gull. 



544. LARUS LEUCOPTERUS FABER. 



White-wing-ed Gull. 



545. LARUS GLAUCESCENS LIGHT. 



Glaucous-wing-ed Criill. 



546. LARUS MARINUS L. 

 Great Black-backed Gull. 



647. LARUS ARGENTATUS BRUNN. 

 Herring* Gull; Common Gull. 



547a. LARUS ARGENTATUS BRUNN., 



var. SMITHSONIANUS Coues. 

 American Herring* Gull. 



547b. LARUS ARGENTATUS BRUNN., 

 var. OCCIDENTALS (And.) Coues. 

 Western Herring- Gull. 



548. LARUS DELAWARENSIS ORD. 



Iting*-billed Gull. 



548a. LARUS DELAWARENSIS ORD, 

 var. CALIFORNICUS (Lawr.) Coues. 

 Californian Gull. 



549. LARUS CANUS L., 



Var. BRACHYRHYNCHUS (Rich.) COUCS. 



American ^lew Gull. 



