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569. Sterna caspia, Pall. 



Caspian Tern. 



570. Sterna anqlica, Mont. 



Gull-billed Tern. 



571. Sterna cantiaca, Gmel. 



Sandwich Tern. 



572. Sterna fuliginosa, Gmel. 



Sooty Tern. 



573. Hydrochelidon hybrida (Pall.). 



Whiskered Tern. 



574. Hydrochelidon leucoptera (Schinz). 



White-winged Black Tern. 



575. Hydrochelidon nigra (Linn.). 



Black Tern. 



Subfamily Laein^:. 



576. Xema sabinii (Sabine). 



Sabine's Gull. 



577. Rhodostethia rosea (Macgill.). 



Cuneate-tailed Gull. 



578. Pagophila eburnea (Phipps). 



Ivory Gull. 



579. Zarus ridibundus, Linn. 



Black-headed Gull. 



580. Larus melanocephalus, Natt. 



Adriatic Gull. 



581. Larus ichthyaetus, Pall. 



Great Black-headed Gull. 



582. Larus minutus, Pall. 



Little Gull. 



583. Larus canus, Linn. 



Common Gull. 



584. Larus gelastes, Licht. 



Slender-billed Gull. 



585. Larus audouini, Payr. 



Audouin's Gull. 



586. Larus argentatus, Gmel. 



Herring-Gull. 



587. Larus leucophceus, Bruch. 



Yellow-legged Herring-Gull. 



588. Larus affinis, Reinh. 



Siberian Herring-Gull. 



589. Lartis fuscus, Linn. 



Lesser Black-backed Gull. 



