in this southeast corner and near Oahu. Greatly reduced numbers were seen throughout the remaining area of the grid. Sooty Shearwater Only 239 of this species were seen in the grid in April, an 86% decrease from 1684 in March. This decrease is mainly accounted for by the thick wave of birds seen at the northern end of the grid on 3 April during the first cruise. Excluding this day, numbers seen during the two cruises were quite similar. No flocking has been observed in this spring migration. All birds were headed north or northwest. On only one occasion four birds of this species were observed resting on the water. None was observed feeding. Christmas Island Shearwater One bird of this species was observed at close range on 25 April at the southern end of the grid. Newell's Shearwater Twelve birds of this species were seen in April, a slight decrease from 13 in March. The birds were distributed north of the islands and in the southeast and southwest corners of the grid. Solander's Petrel ? A medium-sized smoky-grey petrel with large white patches on the underwing surfaces seen very clearly at a distance of 50 yards 25 April was thought to be this species.