168 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol,. 54. 



Measurements of specimens of Oceanodroma leucorhoa leucorhoa — Continued , 



1 Used in measurement averages on p. 166. 



OCEANODROMA LEUCORHOA BEALI Emerson. 



Oceanodroma beali Emerson, Condor, vol. 8, March 20, 1906, p. 54 (Sitka Bay, 



Alaska). 

 Oceanodroma beldingi Emerson, Condor, vol. 8, March 20, 1906, p. 54 (Netarts 



Bay, coast of Oregon). 



Subspecific characters. — Similar to Oceanodroma leucorlioa leucorhoa , 

 but decidedly smaller, particularly the wing, tail, exposed culmen, 

 and middle toe. 



Measurements. — ^Male:^ Wing, 138-151 (average, 144.8) mm.; tail, 

 75-84 (80.1); exposed culmen, 14.5-15.2 (14.8); height of bill at 

 base, 5.5-6.5 (5.8); tarsus, 22.5-24 (23.2); middle toe without claw, 

 17.2-19.8 (18.3); fork of tail, 13-22 (18.2). Female i^ Wing, 143.5- 

 152 (average, 147.6) mm.; tail, 78.5-84.5 (81.6); exposed culmen, 

 14.5-15.1 (14.9); height of bill at base, 5.5-6 (5.7); tarsus, 22.1-24.2 

 (23.1); middle toe without claw, 18-19.5 (18.7); fork of tail, 15-18.8 

 (17.4). 



Type-locality. —Siika Bay, Alaska. 



Geographic distribution. — Coast region of northwestern North Amer- 

 ica: breeds from southeastern Alaska south to the coast of Oregon; 

 migrates south to the coast of California. 



Remarlcs. — There is apparently no color difference between this 

 race and Oceanodroma leucorhoa leucorhoa, nor any appreciable dif- 

 ference in the depth of the fork of the tail, but the present form is 

 sufficiently smaller to warrant subspecific separation; in fact, birds 

 from Washington and Oregon have been commonly referred to Ocea- 



2 Eleven specimens, from the coast of Oregon and Washington. 

 ^Nine specimens, from the coast of Oregon and Washington. 



