General Discussion The substantial increase in numbers of flocks between this month's total (78) and the total for April 1964 (27) is somewhat balanced by the difference in mean flock size. (29 birds per flock this month and 69 in April 1964). Direct migrants accounted for 13.5 o/o of the month's total (4068), and wintering birds accounted for an additional 10 o/o. The remainder is accounted for by birds breeding in the Central Pacific (71.5 o/o) and by unidentified birds (5 o/o). The large buildup in numbers of direct migrants, predominantly Sooty Shearwaters, of the first week of April 1964 was felt to have come during the in-port period between the March and April cruises this year, so that direct migrants did not attain anything near the 49 o/o level they did on the March 1964 cruise. March and April 1965's total numbers compare quite favorably. Overall distribution of the predominant species (Sooty Tern, Wedgetailed Shearwater) varied slightly between this month and April 1964. Greater concentrations were found along the 154° W leg down to 10°N and relatively fewer birds were seen around Oahu and in the southeastern corner, although these two areas were still fairly active. Of special interest was the sighting of two mixed flocks of Leach's Petrels and Bulwer's Petrels. New high totals were recorded for Leach's Petrel (297) and for Pomarine Jaeger (60), the latter enjoying the most widespread distribution noted for the species as well. Blue-gray Noddies were sighted for the first time. Significant sightings included a possible New Zealand Shearwater, a possible Herald's Petrel, a gull, two long-tailed