Auk 
252 AntuHony, Nesting Habits of Shearwaters. july 
Thinking I would find eggs, I returned to San Benedicto from 
Socorro Island two weeks later, but was disappointed. Many of 
the burrows were empty, and all had been extended two feet or 
more in length, and the nest of green plants moved back to the 
end. As before, when birds were found there were usually 
two. 
The two following weeks were spent at Clarion, between two 
and three hundred miles west of San Benedicto. At Clarion, 
P. cuneatus was rare, and only seen at sea. Neither here nor at 
Socorro were there any signs of nesting colonies. San Benedicto 
was reached again May 31, and though dozens of burrows were 
opened, scarcely any birds were found. The tunnels had now a 
length of from eight to ten feet, having been extended another 
two feet or more, and as before the nesting material moved to the 
end. The few birds found were generally in the shorter bur- 
rows, which were perhaps incomplete. Only one egg was found 
with the parent, a white-bellied bird. 
Toward evening a greater percentage of birds began to appear 
from seaward, but at no time before dark did the numbers congre- 
gated about the island equal those seen a month earlier. 
From the data obtained I would place the nesting season of 
P. cuneatus at least three months later than that of either ofzstho- 
melas ox auricularis, which both deposit their eggs at about the 
same time, in early March. 
