Remsen, J.V. 1977 Galapagos Storm Petrel Oceanodroma tethys Oct. 1 Monterey Bay boat trip, Monterey Co., Calif.: I with petrel rafts off Moss Landing which was spotted by Guy McCastlie and Rich Stallcup and eventually seen by almost everyone on our boat. What was undoubtedly the same bird had been seen by Arnold Small here the week before and identified tentatively as Galapagos from unsatisfactory looks, and much to Arnold's credit, identified correctly. I saw the bird on 2 separate occasions within a 10 minute period and watched the bird in flight for probably a total of 15-20 seconds from 75-200 ft. in good light and also saw the bird swimming on the water with Ashy Storm Petrels for 1-2 minutes, from as close as 75 ft. In the previous 1/2 hours, I had also seen 2 Wilson's Storm Petrels several times, and so a fresh mental comparison was possible, although the two species were never compared directly. The bird was conspicuously smaller than the Ashy Storm-Petrels with which it associated. Not only was this noticed in flight but while the birds were swimming together on the water. In my opinion, it was easier to see that the Galapagos was smaller- than the Ashys than that Ashys were smaller than Blackls when sitting on the water. I would say that the bird was almost as small as a Least Storm Petrel. In flight both the wingspan and total body length was noticeably less than Ashy's. The most striking feature was the conspicuous white rump and tail. The while extending from the upper edge of the rump nearly to the tip of the tail, There was a narrow band of black at the tip of the tail and some black along the lateral