-u- 
Tahiti Petrel (2) 
Two birvis believed to be this species were seen on 1$ October# The 
same number of this species or the similar Phoenix Island Petrel were seen 
last month. Without specimens identification of this species it is highly 
questionable# 
Mottled Petrel (7$ & 2 nocturnal) 
Mottled Petrels again migrated through the Grid during the month of 
October in small numbers* Last year 6h were recorded while none were noted 
in September# Generally the birds were seen singularly moving in a 
southerly direction. All four birds collected had enlarged gonads and 
heavy fat. One of the birds had a stomach full of squid. 
Black-winged Petrel (U 1 nocturnal) 
Black-winged Petrels decreased again this month# Sixteen birds were 
seen last month and only one last October# Evidently the birds are moving 
south to the New Zealand breeding grounds# 
White-winged Petrel (10) 
Ten White-Winged Petrels were seen this comth compared with 3 noted 
last month. Three individuals were also seen last October. 
Both birds that were collected had a black border on the underwing and 
a hash mark similar to Black-winged Petrels. Therefore I consider the underwing 
aot a very reliable field characteristic for separating the two species. The 
head is the best way to tell them apart. White-winged Petrels had a black 
head and side of head while the Black-wings have a light gray head. 
