GEN. 281-291 OF KBT. 105 



550. LABUS EBUEWEUS Gm. 



Jvory Oull. 



551. LABUS BELCHEEI Vigors. 



M^bite-Iieaded Oull 



652. LABUS TBIDACTYLUS L. 



KUtlfvake Oull. 



552a. LABUS TBIDACTYLUS L., 

 var. KOTZBBUi (Bp.) Coues. 

 Pacific Kittiwake. 



653. LABUS BBEVIBOSTBIS (Brandt) Coubs. 



Staort-billed Xtittiwake. 



554. LABUS ATBICILLA L. 



liaug-Iiingr €rull. 



555. LABUS FBANKLINI Rich. 



franklin's Rosy Criill. 



656. LABUS PHILADELPHIA (Ord) Coubs. 



]Sonai>ai'te's Oull. 



657. BHODOSTETHIA BOSEA (Macgill.) Bp. 



'Vredg-e-tailed Oull. 



658. XEMA SABINEI (Sab.) Bp. 



S'ork-tailed OuU. 



659. XEMA PUBCATUM (Neboux). 



SwallOYV-talled Crull. 



660. STEBNA ANGLICA Montagu. 

 OuII-billed Tern ; iriarsk Tern. 



561. STEBIfA CASPIA Pallas, 

 var. imperator Coues. 

 Caiii>lan Tern. 



662. STEBIfA BEGIA Gambbl. 

 Boyal Tern. 



