20 
THE CONDOR 
Vol. XV 
Diego, April 12; San Martin Island, one hundred and sixty-five miles south of San 
Diego, April 9, 10, ii and 23; San Geronimo Island, two hundred and twenty 
miles south of San Diego, April 13 and 14; and Cerros Island (south end), 
three hundred and sixty miles south of San Diego, April 15 to 21, inclusive. 
The following is a list of species noted on the trip. All notes and recoras 
of specimens taken are provided by the writer personally unless otherwise stated. 
AEchmophorus occidentalis. Western Grebe, Common in flocks at Colnett 
Bay, April 7 and 8. None observed there on our return April 24. 
Colymbus nigrieollis californicus. Eared Grebe. Several seen and one taken 
at Colnett, April 8. 
Gavia immer. Loon. One bird in fine spring plumage noted in San Diego 
Bay April 4 ; another seen in the same locality April 26. 
Gavia pacifica. Pacific Loon. Common at all points south to San Quentin 
Bay. Many seen migrating northward. Much less plentiful on our return jour- 
ney. 
Ptychoramphus aleuticus. Cassin Auklet. Breeding in small numbers on To- 
dos Santos and Cerros, and in an immense colony on San Geronimo. It was 
hardly possible to walk anywhere on the latter island without sinking knee deep 
into auklet burrows. In rocky portions of the island the birds were nesting in 
crevices in the rocks. Most of the nests contained incubated eggs on April 14, 
but a few fresh eggs and two downy young were found. Of thirty incubating 
birds taken on the afternoon of the 14th, eighteen were females and twelve were 
males. 
Brachyramphus hypoleucus. Xantus Murrelet. Fairly common on the ocean, 
but not found breeding although particularly sought for. 
Larus occidentalis. Western Gull. Abundant everywhere we went. Not 
yet nesting. 
Larus argentatus. Herring Gull. Larus californicus. California Gull. One 
bird of each species seen in San Diego Bay April 4. 
Larus heermanni. Heermann Gull. One seen at Santo Tomas April 7, and 
another at San Martin Island, April 9. Several seen in San Quentin Bay April 
12, and at San Geronimo Island April 14. Not plentiful, the majority evidently 
having passed southward to the breeding grounds previous to this date. 
Larus Philadelphia. Bonaparte Gull. Seen in San Diego Bay April 4. 
Sterna maxima. Royal Tern. Abundant everywhere we went. Adult birds 
in fine plumage. Although we took specimens in several different localities, hop- 
ing to find Sterna elcgans, we were unsuccessful. 
Fulmarus glacialis glupischa. Pacific Fulmar. One bird in light plumage seen 
outside the entrance to San Diego Bay April 26 ; one found dead on the beach at 
San Geronimo Island April 14. 
Puffinus opisthomelas. Black-vented Shearwater. Abundant on the ocean 
until about April 15; much less plentiful after that date, probably having passed 
southward to their breeding grounds. 
Puffinus g-riseus. Sooty Shearwater. Common on the ocean during the en- 
tire trip. 
Phalaerocorax dilophus albociliatus. Farallon Cormorant. Common as far 
south as we went. Nest-building on Todos Santos Island April 25. A great part 
of San Martin Island was covered with nests of this species. They were built 
on the tops of low bushes and none were occupied April lo-ii. 
Phalaerocorax penicillatus. Brandt Cormorant. Abundant on all the islands 
