ON TWO RARE PETRELS. tli 
NOTE VII. 
ON TWO RARE PETRELS, OCEANODROMA MONORHIS . 
AND AESTRELATA ATERRIMA 
BY 
Dr. E. D. VAN OORT. 
Mr. P. Buitendyk, Surgeon of the Steam Navigation 
Company »Nederland”, presented to our collection two 
Petrels, collected by him during his latest voyage to the 
Netherlands’ East-India. When lying in the roadstead of 
Semarang, northcoast of Java, at the 25" December 1910, 
a specimen of Oceanodroma monorhis (Swinhoe) was caught 
aboard at night. It is an old male, measuring: wing 156, 
tail 84, culmen 14, tarso-met. 26 mm.; it agrees with the 
description of the type-specimen of Zhalassidroma monorhis 
by Swinhoe in the Ibis of 1867, p. 386 (the toes however 
are wholly black), and with Keuleman’s fine plate in the 
Monograph of the Petrels by Du Cane Godman (Part J, 
1907, p. 32, pl. 14), which represents this type-specimen. 
Mr. Buitendyk preserved the bird in formaline and when 
it was skinned by our taxidermist the nasal opening has 
not been injured; the nasal septum is very short and does 
not extend so far forward as the sides of the nasal tube, 
so that, really, there is a single nasal opening. Our spe- 
cimen is the first example of the genus Oceanodroma, ob- 
served in our Kast-Indian possessions. From Luzon of 
the Philippine Islands Oceanodroma has been recorded by 
McGregor (Man. Philipp. Birds, I, 1909, p. 84), but the 
specimen could not be determined specifically. 
Notes from the Leyden Museum, Vol. XX XIII. 
