GEN. 280-281 oF KEY. 103 
540. STERCORARIUS POMATORHINUS (Temm.) Lawre. 
Pomarime Jaeger. 
541. STERCORARIUS PARASITICUS (Brunn.) Gray. 
BRichardsom’s Jaeger. 
542. STERCORARIUS BUFFONI (Bore) Cougs. 
Aretic Jaeger; Long-tailed Jaeger. 
543. LARUS GLAUCUS Brunn. 
Giaucous Guill. 
544. LARUS LEUCOPTERUS Fazer. 
W hite-winged Guill. 
545. LARUS GLAUCESCENS Licar. 
Glaucous-wimged Gull. 
546. LARUS MARINUS L. 
Great Blach-pPacked Gull. 
547. LARUS ARGENTATUS Bruyn. 
Herring Guil; Common Gull. 
547a. LARUS ARGENTATUS Brunn., 
var. SMITHSONIANUS Coues. 
Americam Herring Gull. 
547b. LARUS ARGENTATUS Brounn., 
var. OCCIDENTALIS (Aud.) Coues. 
Westerm Eerring Gull. 
548. LARUS DELAWARENSIS Orp. 
Ring-billed Gull. 
548a. LARUS DELAWARENSIS Onp, 
var. CALIFORNICUS (Lawr.) Coues. 
Californian Gull. 
549. LARUS CANUS L., 
var. BRACHYRHYNCHUS (Rich.) Coues. 
American Mew Guill. 
