as single birds.Both males and females were collected. Most had some red feathers of the nuptial plumage present, but none were noted to have significantly enlarged gonads. But the heavy fat condition on most specimens as well as the apparently increasing flocking tendency suggests that a migratory movement may be under way or imminent. Density distribution on this cruise was different from that recorded last month when the north and south sections were favored. This cruise no birds were seen in the north section, about 65% were in the central section, and the remainder were in the south. East-west distribution was also different from last month when the western section was highly favored. This cruise the western area still had the most dense population, but the east had fifteen times as many birds as last month. These changes when combined with the fact that the population has been steadily increasing suggests that, if not migrating, the population density is quite static. Pomarine Jaeger (Stercorarius pomarinus) 2 Jaeger sp. (Unidentified) 1 The reduction of numbers suggests that the higher numbers noted last month were indicative of a migration peak. As in past cruises, all sightings were in the eastern portion of the grid. Glaucous-winged Gull (Larus glaucescens) 4 Three of the four sightings were in the north section, and the other was in the central section. All were immature birds. The sharp overall reduction of numbers indicates that this species has probably migrated to the north. Herring Gull (Larus argentatus) 119 The sharp change of distribution since previous cruises is