GEN. 280-281 OF KEY. 103 



540. STERCORARIUS POMATORHINUS (TEMM.) LAWR. 



Pomarine Jaeg-er. 



541. STERCORARIUS PARASITICUS (BRUNN.) GRAY. 



Richardson's Jaegrer. 



542. STERCORARIUS BUPFOWI (Bora) COUES. 

 'Arctic JFaeg-er; Longr-tailed JTaeg*er. 



543. LARUS GLAUCUS BRUNN. 



Glaucous Gull. 



544. LARUS LEUCOPTERTJS FABER. 



Wliite-wing-ed Gull. 



545. LARUS GLAUCESCEWS LIGHT. 



Glaucous-wingred Gull. 



546. LARUS MARINUS L. 

 Great Black-backed Gull. 



547. LARUS ARGENTATUS BRUNN. 

 Herring* Gull; Common Gull. 



647a. LARUS ARGENTATUS BRUNN., 



var. SMITHSONIANUS Coues. 

 American Herring- Gull. 



547b. LARUS ARGENTATUS BRUNN., 

 var. OCCIDENTALIS (And.) Coues. 

 TFestern Herring- Guli. 



548. LARUS DELAWARENSIS ORD. 



Hing--l>illed Gull. 



548a. LARUS DELAWARENSIS ORD, 

 var. CALIFORNICUS (Lawr.) Coues. 

 Californian Gull. 



549. LARUS CANUS L., 



var. BRACHYRHYNCHUS (Rich.) Coues. 

 American Hew Gull. 



