GEN. 280-281 OF KEY. 103 



540. STEBCOBABIUS POMATOBHINUS (TEMM.) LAWR. 



Pomarine Jaegrer. 



541. STEBCOBABIUS PARASITICUS (BRUNN.) GRAY. 



Richardson's Jaegrer. 



542. STEBCOBABIUS BUFFONT (Bora) COUES. 

 Arctic Jaegrer ; I^ongr-tailett 1 Jaeg-er. 



543. LABUS GLAUCUS BRUNN. 



Glaucous Gull. 



544. LABUS LEUCOPTEBUS ABER. 



White-winded Gull. 



545. LABUS GLAUCESCENS LIGHT. 



Glaiicous-wiiigredl Oull. 



' X 646. LABUS MABINUS L. 

 Oreat Blaclt-toaclted Oull. 



^547. LABUS ABGEWTATUS BRUNN. 

 Herring- Oull; Common Crull. 



547a. LABUS ABGENTATUS BRUNN., 



var. SMITHSONIANUS Coues. 

 American Herring* Gull. 



, 547b. LABUS ABGENTATUS BRUNN., 

 var. OCCIDENTALIS (And.) Coues. 

 Western Herring- Gull. 



548. LABUS DELAWABENSIS ORD. 



Gull. 



548a. LABUS DELAWABENSIS ORD, 

 var. CALIFORNICUS (Lawr.) Coues. 

 Californian Gull. 



549. LABUS CANUS L., 

 var. BRACHYRHYNCHUS (Rich.) Coues. 

 American M.eiv Gull. 



