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 bircb, were observed sitting on the 
water. 
Dark-rurped Petrel 
Numbers of this species increased hzi from 131 in '-lay to 186 in 
June. A northward trend in distribution was noted, with relatively 
fewer birds seen in the southern corners of the grid. Over 9Q£ of 
the birds seen south of 20°!? were still undergoing heavy molt, whereas 
90,j of the birds north of 20°N bad new plumage, thus lending further 
- .j - t , - ■ ' Ti 1 * > ' • -7. • . •• .. 1 ' - . 
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* 
t^hite-nacked Petrel 
This species Increased $$ in number from 3U in fey to a June total 
of 37# This slight increase was accompanied by a northward trend in 
distribution, up to 16°II* Molt was noticed on all birds of this species 
again this month* Many of this species were observed sitting on the 
water* 
liarcourt’s Storm Petrel 
This species declined 39£ in nuntoer from 6it in fey to 7 in June* 
The species 1 distribution was, as in the past, random over most of the 
grid area* 
