GEN. 280-281 OF KEY. 103 



540. STEECOEABITJS POMATOEHINUS (Tkmm.) Lawb. 



Pomarine JTaeg-er. 



541. STERCOEABIITS PARASITICUS (Bkunn.) Gray. 



Bicliardson'8 Jaeg'er. 



542. STERCOEARIUS BXJFFONI (Boie) Coubs. 

 Arctic Jaeg-er; I.ong--talIefl Jaegrer. 



543. LARXJS GLAUCUS Brtjnn. 



CrlailCOUS CrUlI. 



544. LARUS LEUCOPTERUS Fabeb. 



'n'liite-wing-ed Oiill. 



645. LARUS GLAUCESCENS Licht. 



Crlaucous-wing-ed Crull. 



646. LARUS [MARINUS L. 

 Crreat Slack-backed OuII. 



547. LARUS ARGENTATUS Brton. 

 Serring- Oull; Common CruU. 



547a. LARUS ARGENT ATUS Brunn., 

 var. SMiTHSONiANus Coues. 

 American Berringr Ctull. 



647b. LARUS ARGENTATUS Brunn., 

 var. occiDBNTALis (Aud.) Coues. 

 fVestern Herring* OuII. 



648. LARUS DELAWARENSIS Ord. 

 Iling--1billed €^ull. 



548a. LARUS DELAWAREWSIS Ord, 

 var. CALiFOBNicus (Lawr.) Coues. 

 Californian Oull. 



B49. LARUS CAWUS L., 

 var. BRACHYRHYNCHUS (Rich.) Coues. 

 American IM.en' Crull. 



