Bonin Island Petrol con*t. 
comer of the grid area. This species completed its post breeding 
molt during July, as evidenced by the preponderance of birds seen in July 
with immaculate new plurage. 
Dark-rtnped Petrel 
This species Increased 227$ in number from 186 in June to 609 in 
July. By the end of the month most birds seen had finished molting. This 
species was distributed throughout the grid area except for the northwest 
corner. Several feeding flocks composed exclusively of this species were 
noted* Two birds were observed catching flying fish. Five of this species 
were collected, all of which were molting. One, collected in the afternoon 
had a fresh squid in its craw. Three of the birds were losing brood patch 
feathers and the reproductive organs of these birds were beginning to en¬ 
large, indicating that they are possibly just preparing to breed. This 
suggests an August breeding season for the birds of this species appearing 
in the grid area. Study of the collected specimens should reveal the 
land base of these birds. 
Milt o-necked Petrel 
Thirty-eight of this species was seen in July, one more than in June. 
This species was seen as far north as 22°N, and was invariably in the com¬ 
pany of Dark-moped Petrels. One of this species was collected. It was 
molting heavily. 
Bulwer’s Petrol 
Fifty-eight of this species were seen in July, a 16$ increase over 
the $0 seen in June. Almost all of these were observed close to the 
