GEN. 280-281 OF KEY. 103 



540. STERCORARIUS POMATORHINUS (Tej!m.) Lawr. 



Poiuai'iiic Jiiegrer. 



541. STERCORARIUS PARASITICUS (Brunn.) Gray. 



]licli»i'cli§on'ji Jnegei*. 



542. STERCORARIUS BUEFOWI (Boik) Coues. 

 Arctic Jaeger; l.ong'-tailetl JTueg'er. 



543. LARUS GLAUCUS Brunn. 



<^laiicoiis C^iill. 



544. LARUS LEUCOPTERUS Faber. 



^f^liite-^^'iiiged CJiall. 



545. LARUS GLAUCESCENS Light. 



OSiiucoiis-\viiig'e<l Gitifll. 



546. LARUS MARINUS L. 

 Oreat ltlack-ll>ackecl Oiill. 



547. LARUS ARGENTATUS Brunn. 

 Herring* (jiull; Cosmibioii 4^itll. 



547a. LARUS ARGENTATUS Brunn., 

 var. SMiTiisoxiANUs Coues. 

 AntericaiB Ileri'ingr Ciiill. 



547b. LARUS ARGENTATUS Brunn., 

 var. occiDENTALis (And.) Cones. 

 "W^esterii Herring* Cciill. 



548. LARUS DELAWARENSIS Ord. 



Ring--I>ille(l G^ull. 



548a. LARUS DELAWAREWSIS Ord, 

 var. CALiFORNicus (Lawr.) Coues. 

 Calit'ornian Oull. 



549. LARUS CANUS L., 



var. BRACHYRUYNCHUS (Ricli.) Coues. 

 American Me^v €iull. 



