Ttfhite-tailed Tropicbird 
Three of the eight seen in April were within 20 miles of Kauai. 
The rest were distributed randomly over the area. 
Blue-faced Booby 
One of the five seen this month was at 17° N; the others were at 
the extreme southern end of the area, where most of the birds of this 
species have been seen. Numbers were consistent with past months. 
Brown Booby 
Five birds were seen in a feeding flock just 10 miles north of Oahu 
on 30 April. 
Red-footed Booby 
Only one of the 46 seen in April was more than 50 miles from Oahu. 
It was an immature which came aboard at l8°U during the day. It was banded, 
notes were taken on its plumage and soft part colors, and it was released. 
Great Frigatebird 
Out of 26 birds l6 were seen within 100 miles of the high Hawaiian 
Islands this month. All were within 300 miles of land. Larger numbers 
of Frigates have been seen in the past two months ( 19 , 26 ) than in 1964 (4, 2). 
The difference is felt to be significant, but no explanation is readily 
forthcoming. 
Arctic Tern (?) 
Twenty-seven birds probably Arctic Terns but possibly common Terns 
were observed heading north, usually in groups of two, in April. A similar 
northward migration was noted in April 1964 . The birds were seen often to 
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