124 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



Color. Adult Male. — General color above, sooty black. Below partly 

 black, and largely white. 



Head : Sooty black. 



Neck : Sooty black except the throat, which has the bases of the feath- 

 ers white, more or less concealed, and varying in amount. In some indi- 

 viduals it appears as an immaculate area and in the others the white is 

 almost obscured by the sooty black ends of each feather. 



Back: Sooty black; the bases of the upper tail feathers are white 

 more or less concealed. 



Wings : Sooty black, but not so intense as on the head. The greater 

 wing coverts are noticeably paler and the margin of the wing is indistinctly 

 edged with a paler sooty shade. 



Tail : Black, not so dark in shade as the head. The base of the lateral 

 tail feathers is white. 



Lower parts : Throat as described, rest of lower neck sooty black. 

 The breast and middle of the abdomen sooty. The bases of the feathers 

 of the sides and flanks and of the under tail-coverts pure white more or 

 less obscured by the sooty larvinual portion of each feather 



Bill black. 



Legs black. 



Feet dusky. 



The female is similar to the male in size and color. 



Geographical Range. — The Southern Ocean north to the Bay of Ben- 

 gal, and in the Atlantic north (casually?) to the Tropic of Cancer. 



Breeds at the Falkland Islands. (Sclater & Salvin, Voy. Chall. II. 

 Birds, App. p. 151). 



This petrel was not observed or collected by the Princeton Expeditions. 

 The description is based on the series of this species in the Collections 

 of the British Museum of Natural History. 



Fregetta grallaria (Vieillot). 



Procellaria grallaria, Vieill, N. Diet. d'Hist. Nat. XXV. p. 418 (181 7); 



Scl. & Salv. Nomencl. Av. Neotr. p. 148 (1873). 

 Thalassidroma segethi, Phil. & Landb. Av. Chil. p. 46 (1868: Valdivia). 



