52 



663. LARUS MARINUS Lixir. 



Great Black-backed Gxill. [660.] 



C64. LARUS OCCIDENTALIS AuD. 



■Western Gull. [GG2.) 



[665.] LARUS AFFINIS Reixh. 

 Siberian Gull. 



666. LARUS ARGENTATUS Brunn. 



Herring Gull. 



666 a. LARUS ARGENTATUS SMITHSONIANUS COUES. 

 American Herring Gull. [661.] 



667. LARUS CACHINNANS Pall. 



Pallas' s Herring Gull. 



668. LARUS CALIPORNICUS Lawr. 



CaHfomian Gull. [663.] 



669. LARUS DELAWARENSIS Ord. 



Ring-billed Gull. [664.] 



670. LARUS BRACHYRHYNCHUS Rich. 



Short-billed GuU. [ 664 a, 665, 673. ] 



t671.] LARUS CANUS Linn. 

 Mew Gull. 



672. LARUS HEERMANNI Cass. 



Heermann's Gull. [666.] 



673. LARUS ATRICILLA Linn. 



Laughing Gull. [667.] 



674. LARUS FRANKLINI Sw. & Rich. 



Franklin's Gull. [668, 669. ] 



675. LARUS PHILADELPHIA (Okd) Gray. 



Bonaparte's Gull. [670.] 



676. RHODOSTETHIA ROSEA (Macgill.) Bruch. 



Ross's GuU. [678.] 



677. XEMA SABINEI (J. Sabine) Leach. 



Sabine's Gull. [080.] 



678. CREAGRUS FURCATUS (Neb.) Bp. 



Swallow-tailed Gull. [679.] 



679. STERNA ANGLICA Montag. • 



Gull-billed Tern. [681.] 



680. STERNA CASPIA Pall. 



Caspian Tern. [682.] 



681. STERNA REGIA Game. 



Royal Tern. [683.] 



