LIST OF PLATES 



IN VOLUME VI. 



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1. Black Tern. Hydrochelidon nigra (Linn.) . . 1 



2. White-winged Black Tekn. Hydrochelidon leu- 



coptera (Schinz) 3 



3. Whiskered Tern. Hydrochelidon hybrida (Pallas) 5 



4. Gull-billed Tern. Sterna anglica, Montagu . 9 



5. Caspian Tern. Sterna caspia, Pallas .... 11 



6. Sandwich Tern. Sterna cantiaca, J. F. Gmeliu . 13 



7. Roseate Tern. Sterna dougalli, Montagu . . . 15 



8. Common Tern. Sterna fluviatilis, Naum. ... 17 



9. Arctic Tern. Sterna macrura, Naum. ... 20 



10. Little Tern. Sterna minuta, Linn '21 



11. Sooty Tern. Sterna fuliginosa, J. F. Gmelin . 26 



12. Lesser Sooty Tern. Sterna ancestheta, Scopoli . 28 



13. Noddy Tern. Anons stolidus (Linn.) .... 29 



14. Sabtne's Gull. Larus sabinii, J. Sabine ... 32 



15. Cuneate-tailed Gull. Larus roseus, Macg. . 33 



16. Do. Do. Immature and winter 34 



17. Bonaparte's Gull. Larus philadelphicus (Orel) . 35 



18. Little Gull. Larus minutus, Pall 37 



19. Black-headed Gull. Larus ridibundus, Linn. . 39 



20. Mediterranean Black-headed Gull. Larus 



melanocephalus, Natterer 43 



