3 was distributed throughout all but the northern end of the grid area, indicating a northward spread from its May distribution. Many of this species, in every case molting birds, were observed sitting on the water. Dark-rumped Petrel Numbers of this species increased 42% from 131 in May to 186 in June. A northward trend in distribution was noted, with relatively fewer birds seen in the southern corners of the grid. Over 90% of the birds seen south of 20°N were still undergoing heavy molt, whereas 90% of the birds north of 20°N had new plumage, thus lending further support to the theory that the birds seen in the southern portion of the grid are from the Galapagos Island population. Many of the molt- ing birds were observed sitting on the water. White-necked Petrel This species increased 9% in number from 34 in May to a June total of 37. This slight increase was accompanied by a northward trend in distribution, up to 16°N. Molt was noticed on all birds of this species again this month. Many of this species were observed sitting on the water. Harcourt's Storm Petrel This species declined 89% in number from 64 in May to 7 in June. The species' distribution was, as in the past, random over most of the gird area.