52 



663. LARUS MARINUS Linn. 



Great Black-backed Gull. [660.] 



664. LARUS OCCIDENTALIS Aud. 



"Western GuU. [662.) 



[665.] LARUS AFFINIS Reinh. 

 Siberian Gull. 



666. LARUS ARGENTATUS BRttNN. 



Herring Gull. 



666 a. LARUS ARGENT ATUS SMITHSONIANUS COUES. 

 American Herring Gull. [661.] 



667. LARUS CACHINNANS Pall. 



Fallas's Herring Gull. 



668. LARUS CALIFORNICUS Lawr. 



Califomian Gull. [663.] 



669. LARUS DELAWARENSIS Ord. 



Ring-billed GuU. [664.] 



670. LARUS BRACHYEHYNCHUS Rich. 



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



£671.] LARUS C ANUS Linn. 

 Mew GuU. 



672. LARUS HEERMANNI Cass. 



Heermann's GuU. [666.] 



673. LARUS ATRICILLA Linn. 



Laughing GuU. [667.] 



674. LARUS FRANKLINI Sw. & Rich. 



Franklin's Gull. [668, 669. ] 



675. LARUS PHILADELPHIA (Oud) Grat. 



Bonaparte's Gull. [670.] 



676. RHODOSTETHIA ROSEA (Macgill.) BruCH. 



Ross's GuU. [678.] 



677. XEMA SABINEI (J. Sablxe) Leach. 



Sabine's GuU. [C80.] 



678. CREAGRUS PURCATUS (Neb.) Bp. 



SwaUow-taUed GuU. [679.] 



679. STERNA ANGLICA Montag. 



Gnll-biUed Tern. [681.] 



680. STERNA CASPIA Pall. 



Caspian Tern. [682.] 



681. STERNA REGIAGamb.' 



Royal Tern. [683.] 



