294 



Lams pipixcan, Franklin's gull . . — inland — — — — 

 Lams melanocephalus, Mediter- 

 ranean black-headed gull . . — — — — + — 

 Larus genet, slender-billed gull . . — — — + + ? 

 Larus Philadelphia, Bonaparte's 



gull . . . . . . . . — inland — — — — 



Larus minutus, little gull . . . . — — — + — — 



Rhodostethia rosea, Ross's gull .. — — _!_** — — — 



Rissa tridactyla, kittiwake . . — + + + — — 



Xema sabini, Sabine's gull . . — just + — — — 



Chlidonias hybrida, whiskered tern — — — + + + 

 Chlidonias leucoptera, white-winged 



black tern . . . . . . — — — casual casual — 



Chlidonias nigra, black tern . . — + — + + — 



Phaetusa simplex, large-billed tern + — — — — — 



Gelochelidon nilotica, gull-billed tern + + — + + ? 



Hydroprogne caspia, Caspian tern — + — + + ? 



Sterna hirundo, common tern . . + + + + + — 



Sterna paradisaea, arctic tern .. — + + + — — 



Sterna f or steri, Forster's tern . . — + — — — — 



Sterna dougallii, roseate tern . . 4- + — + + — 



Sterna anaetheta, bridled tern . . + + — — — ? 



Sterna fuscata, sooty tern . . . . + + — — — ? 



Sterna super ciliaris, yellow-billed 



river-tern .. .. ..+ — — — — — 



Sterna albifrons, little tern . . + + — + + + 



Thalasseus maximus, royal tern . . + + — ? — ? 

 Thalasseus bengalensis, lesser 



crested tern .. .. .. — — — — + — 



Thalasseus eurygnatha, Cayenne 



tern .. .. .. ..+ — — — — — 



Thalasseus sandvicensis. Sandwich 



tern + + — + + — 



Anoiis stolidus, noddy . . . . + + — — — + 



Anoiis minutus, white-capped noddy + — — — — — 



C Rynchops nigra, black skimmer . . + + — — — — 

 <( Rynchops Jlavirostris, African 



(^ skimmer •• .. .. — — — — — + 



Plautus alle, little auk . . . . — — + — — — 



Alca impennis, great auk . . — extinct — extinct — — 



Alca torda, razorbill . . . . — + -f + — — 



Uria lomvia, Briinnich's guillemot — + + + — — 



**only once on Atlantic side. 



