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Family Laridcc —(Continued). 
273 The Glaucous-winged Gull, Larus glaucescens . 1366 
274 The Western Gulls, Larus occidentalis . 1376 
275 The Herring Gull, Larus argentatus argentatus . 1394 
276 The California Gull, Larus californicus . 1398 
277 The Ring-billed Gull, Larus delawarensis . 1413 
278 The Short-billed Gull, Larus canus brachyrhynchus . 1418 
279 The Franklin Gull, Chroicocephalus franklini . 1420 
280 The Bonaparte Gull, Chroicocephalus Philadelphia . 1422 
281 The Heermann Gull, Blasipus heermanni . 1428 
282 The Sabine Gull, Xema sabini . 1433 
P'amily Sternidee —Terns. 
283 The Caspian Tern, ILydroprogne caspia . 1435 
284 The Royal Tern, Thalasseus maximus . 1439 
285 The Elegant Tern, Thalasseus elegans . 1441 
286 The Forster Tern, Sterna forsteri . 1443 
287 The Common Tern, Sterna hirundo . 1448 
288 The Arctic Tern, Sterna paradiscea . 1450 
289 The Least Tern, Sternula antillarum browni . 1453 
290 The Black Tern, Chlidonias nigra surinamensis . 1460 
Order Alciformes—Auk-like Birds. 
Family sEthiidce —Auklets. 
291 The Cassin Auklet, Ptychoramphus aleuticus . 1467 
292 The Paroquet Auklet, Phaleris psittacula . 1474 
Family Cepphidcc —Guillemots. 
293 The Pigeon Guillemot, Cepphus columba . 1475 
Family Brachyramphidcc— Murrelets. 
294 The Ancient Murrelet, Synthliboramphus antiquus . 1481 
295 The Marbled Murrelet, Brachyramphus marmoratus . 1484 
296 The Xantus Murrelet, Endomychura hypoleuca . 1489 
Family Alcidce —Auks, Murres. 
297 The California Murre, Uria troille calif or nica . 1494 
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