Bulwer's Petrel con't. islands. Twenty-eight were seen within a period of one-half hour during the evening of 13 July, all heading toward Lanai, less than ten miles distant. Harcourt's Storm Petrel Only two of this species were seen in the grid area, both toward the southern end. This species has steadily decreased in numbers in the grid area from a peak of 129 birds in April. Red-tailed Tropicbird Numbers of this species increased 47% from 15 in June to 22 in July. This species was fairly randomly distributed throughout all but the south- eastern corner of the grid area. Two very young birds were seen, both heavily vermiculated on the back and lacking central retrices altogether. White-tailed Tropicbird This species increased in numbers 57% from seven in June to eleven in July. All of these were seen in the northern half of the grid area. Brown Booby Two of this species were seen on 1 August heading toward Moku Manu, only fifteen miles distant. Red-footed Booby Seventeen of this species were observed in July. All but one of these were seen in the vicinity of Oahu. The other, an immature, was seen 400 miles northeast of Oahu, further from land than any Red-footed Booby seen thus far in the grid area.