Il6 PATAGONIAN EXPEDITIONS I ZOOLOGY. 



Bill, 0.7 inch. 



Tail, lateral rectrices, 2.7 inches ; central rectrices, 2.45 inches. 

 Tarsus, 1.37 inches. 



Color. Adult. — General color throughout sooty black. 

 Head: Sooty black, the forehead paler. 

 Neck : Sooty black. 



Back : Sooty black ; the upper tail coverts immaculate white forming a 

 conspicuous white area. 



Fig. 6"]. 





^'^^' 



Oceanites oceanica. Profile of head. Oceanitcs oceanica. Head from above. 



From material in the British Museum. From material in the British Museum. 



Natural size. Natural size. 



Wing: Sooty black, except the greater wing coverts which are slaty 

 greyish, with distinct whitish edging at the tips. The under wing coverts 

 are sooty. 



Tail black, with'the shafts of the lateral rectrices white at their bases, 

 and a part of the inner webs of the same equal to the white portion of their 

 shafts white or whitish. 



Lower parts : Paler sooty black as compared with the upper parts, and 

 with a white area on the flanks, and some of the under tail coverts with 

 white markings especially on their outer webs and tips. 



Bill black. 



Legs black. 



Feet black, with a portion of the web between the toes pale orange- 

 yellow. 



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



