NO, 2230. REVIEW OF OCEANODROMA LEUCORHOA—OBERHOLSER. 171 

 OCEANODROMA LEUCORHOA KAEDINGI Anthony. 



Oceanodroma kaedingi Anthony, Auk, vol. 15, No. 1, January, 1898, p. 37 ("at 

 sea near Guadalupe Island, Lower California"). 



Subsfedfic characters. — Similar to Oceanodroma leucorJioa heali, but 

 decidedly smaller, especially the wing, tail, tarsus, and middle toe, 

 the greatest difference appearing in the shortness of the tail; tail 

 much less forked; and pileum more distinctly plumbeous. 



Measurements. — Male:^ Wing, 137-145 (average, 140.4) mm.; tail, 

 66.5-74.5 (71.1); exposed culmen, 12.8-15 (13.9); height of bill at 

 base, 4.5-6 (5.4); tarsus, 20-21.5 (20.6); middle toe without claw, 

 15.3-17.2 (16.5); fork of tail, 9.8-17.5 (13.6). Female: = Wing, 138- 

 145.5 (average, 142.6) mm.; tail, 67.5-77 (72.4); exposed culmen, 

 13.5-14 (13.9); height of bill at base, 5-6 (5.5); tarsus, 19.5-21.3 

 (20.7); middle toe without claw, 15-17.8 (16.4); fork of tail, 10-18.5 

 (12.6). 



Type-locality. — Pacific Ocean off the coast of northern Lower Cah- 

 fornia, in latitude 31° N.; longitude 117° W. 



Geograpliic distrihdion. — The Pacific coast and islands of Lower 

 California, south to Clarion and Socorro Islands in the Revillagigedo 

 group, Mexico, and north probably also to southern California. 



RemarTcs. — This race is similar to Oceanodroma leucorlioa leucorJioa, 

 but in size differs decidedly more from the typical subspecies than 

 it does from Oceanodroma leucorlioa heali. Although the depth of the 

 forking of the tail varies somewhat, as may be seen in the appended 

 table of measurements, it is much less in Oceanodroma leucorlioa 

 Icaedingi than in either of the two other subspecies, and is an excellent 

 character for distinguishing the present race. Although Oceanodroma 

 leucorlioa heali is of the same color as Oceanodroma leucorlioa leucorlioa, 

 the present form seems to differ in the more distinctly plumbeous 

 shade of the pileum, which the excellent series at our disposal shows 

 to be fairly constant. As may be seen by the above-given characters, 

 Oceanodroma leucorlioa Icaedingi is much more different from either 

 Oceanodroma leucorhoa leucorlioa or Oceanodroma leucorlioa heali than 

 the two latter are from each other, but it is undoubtedly only a 

 subspecies, since its characters intergrade individually with those of 

 Oceanodroma leucorhoa heali. 



All the specimens of Oceanodroma leucorhoa Icaedingi at present 

 known have been taken at sea near Guadalupe Island, Lower Cali- 

 fornia, or off the coast of northern Lower California, or in the region 

 southward to the Revillagigedo Islands. Its breeding ground is not 

 definitely known, but may be assumed to be some of the islands 

 within this area. However, it may be a breeding bird on the islands 

 off central and southern California, as birds of this species from the 



1 Seventeen specimens, from the Pacific Ocean, off the coast of northern Lower California. 



2 Eight specimens, from the Pacific Ocean, off the coast of northern Lower California. 



