172 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 54. 



Farallon Islands, California, have not been available in the present 

 connection. 



Among the birds examined, not only of this form, but of the two 

 other subspecies of Oceanodroma leucorhoa as well, are specimens in 

 which the middle upper tail-coverts are more or less extensively, 

 sometimes wholly, brown ; and in the series of Oceanodroma leucorhoa 

 Tcaedingi are four specimens, males and females, that have very 

 little white on the upper tail-coverts, this being restricted to the 

 outer vanes of the shortest lateral feathers. This variation is 

 apparently individual, but it may be a lingering mark of the juvenal 

 plumage. 



Twenty-five specimens of this form have been examined, all of 

 which are included in the following table of measurements : 



Measurements of specimens of Oceanodroma leucorhoa haedingi. 



1 Used in measurement averages on p. 171. 



2 Type of Oceanodroma Tcaedingi Anthony. 



