Bonin Island Petrel con't. corner of the grid area. This species completed its post breeding molt during July, as evidenced by the preponderance of birds seen in July with immaculate new pluvage. Dark-rumped Petrel This species increased 227% in number from 186 in June to 609 in July. By the end of the month most birds seen had finished molting. This species was distributed throughout the grid area except for the northwest corner. Several feeding flocks composed exclusively of this species were noted. Two birds were observed catching flying fish. Five of this species were collected, all of which were molting. One, collected in the afternoon, had a fresh squid in its craw. Three of the birds were losing brood patch feathers and the reproductive organs of these birds were beginning to en- large, indicating that they are possibly just preparing to breed. This suggests an August breeding season for the birds of this species appearing in the grid area. Study of the collected specimens should reveal the land base of these birds. White-necked Petrel Thirty-eight of this species was seen in July, one more than in June. This species was seen as far north as 22°N, and was invariably in the com- pany of Dark-rumped Petrels. One of this species was collected. It was molting heavily. Bulwer's Petrel Fifty-eight of this species were seen in July, a 16% increase over the 50 seen in June. Almost all of these were observed close to the