(op ON TWO RARE PETRELS. 
The second Petrel is an example of the very rare Aes- 
trelata aterrima (Bonaparte), caught aboard ship at night 
in the Gulf of Aden at the 11" of January 1911. It seems 
that only three examples of this species were known in 
European Musea, one in Leyden and one in Paris, both 
from the Island of Réunion (the two type-specimens of 
_ Pterodroma aterrima Bonaparte, Consp. Av. II, 1855, p. 191), 
and another one in the University Museum of Cambridge, 
originally preserved in the St. Denys Museum in Mauritius. 
Our second example thus is the fourth one known in 
European collections. It is darker and more blackish than 
the type-specimen of Bonaparte, and there are some yel- 
lowish white feathers on the lores and on the head, which 
likely are the remains of the juvenile plumage. The feet 
are not yellow and black as stated by Schlegel, but greyish 
flesh-colour with black outer toe and black terminal por- 
tions of the other toes. The rusty colour of the feet in the 
figure of the plate in Du Cane Godman’s Monograph of 
the Petrels (Part IIT, 1908, p. 179, pl. 47) is not correct. 
The measurements are: wing 243, tail 122, culmen 30, 
tarso-met. 35 mm. The bird was skinned by Mr. Buitendijk, 
who unfortunately did not determine the sex. 
Leyden Museum, February 1911. 
Notes from the Leyden Museum, Vol. XX XIII. 
