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 20 THE CONDOR Vol. XV Diego, April t2; San Martin Island, one hundred and sixty-five miles south of San Diego, April 9, IO, I I and 23; San Geronimo Island, two hundred and twenty miles south of San Diego, April 3 and 4; and Cerros Island (south end), three hundred and sixty miles south of San Diego, April 5 to 2t, 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 nigricollis californicus. Eared Grebe. Several seen and one taken at Colnett, April 8. flavia iramet. Loon. One bird in fine spring plumage noted in San Diego Bay April 4; another seen in the same locality April 26. flavia pacifica. Pacific Loon. Common at all points south to San Quentin Bay. Many seen migrating northward. Much less plentiful on our return jour- ney. ltychoramphus 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 4, but a few fresh eggs and two downy young were found. Of thirty incubating birds taken on the afternoon of the I4th, eighteen were females and twelve were males. Ilrachyramphus hypoleueus. Xantus Murrelet. Fairly common on the ocean, but not found breeding although particularly sought for. Iarus occidentalis. Western Gull. Abundant everywhere w went. Not yet nesting. Iarus argentatus. Herring Gull. Laru.s,,calffornicus. California Gull. One bird of each species seen in San Diego Bay April 4. Iatrus 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 t2, and at San Geronimo Island April t4- 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. Alth'ough .we took specimens in several different localities, hop- ing to find Cterna elegans, 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 t4- l?uttinus opisthomelas.' Black-vented Shearwater. Abundant on the ocean until about April rS; much less plentiful after that date, probably having passed southward to their breeding grounds. l?uflinus griseus. Sooty Shearwater. Common on the ocean during the en- tire trip. " lhalacrocorax 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 to-do. l?halacrocorax peicillatus. Brandt Cormorant. Abundant 'on all the islands