Family ALCIDA. Auks, Murres. Puffins. 
8. RHINOCEROS AUKLET. Cerorhinca monocerata. 
Rather common winter residents off shore. Occasionally dead 
birds are found washed ashore on beaches. 
9. CASSIN AUKLET. oh igi gus, yx aleuticus. 
More or less abundant at sea all the year. Breed on the 
Coronado Islands. Dead birds wash ashore occasionally. 
10. ANCIENT MURRELET. Sinthliboramphus antiquus. 
Found occasionally off shore in winter. A dead bird was found 
on the beach at Pacific Beach. 
11. XANTUS MURRELET. Brachyramphus hypoleucus. 
rian common at sea all the year. Breed on the Coronado 
Islands. 
Order LONGIPENNES. Long-winged Swimmers. 
Birds of this order feed on fish swimming near the surface of 
the water and on offal floating on the surface, occasionally on 
material picked up on land. Fish are obtained by plunging down 
on them from the air. The fish are mostly small species but little 
used for human food. 
Family STERCORARIDA. Jagers. 
12. POMARINE JAGER.  Stercorarius pomarinus. 
Occasional off shore, principally in the migrations. 
18. PARASITIC JASGER. Stercorarius parasiticus. 
Occasional along the coast in fall and winter. 
14. LONG-TAILED JASGER. Stercorarius longicaudus. 
One taken at Pacific Beach Sept. 19, 1904. 
; Family LARIDA. Gulls and Terns. 
15. PACIFIC KITTIWAKE. Rissa tridactyla pollicaris. 
Occasional off shore in winter. 
16. GLAUCOUS-WINGED GULL. Larus glaucescens. 
Occasional along the coast in winter. 
17. WESTERN GULL. Larus occidentalis. 
Abundant residents of bays and coasts. Rare inland. Breed 
on the Coronado Islands. 
18. HERRING GULL. Larus argenteus. 
Rather common winter residents of the coast and bays. Occa- 
sional about fresh waters. 
19. CALIFORNIA GULL. Larus californicus. 
Common winter residents (Sept. to May) of coast and bays, 
and rather common on fresh waters. Sometimes follows the plow 
to pick up larve and worms. 
20. RING-BILLED GULL. Larus delawarensis. 
Common winter residents of coast and bays (Sept. to May). 
Occasional inland. 
21. SHORT-BILLED GULL. Larus brachyrhynchus. 
Rare winter visitant along-the coast. 
