542 LARIDJS. 



part of the breast, pale ash-colour ; lower breast and all 

 the under plumage, white ; shafts of the first six pri- 

 maries brownish-black at base, becoming gradually darker 

 towards the extremity, where they are black in the first 

 three, but in the fourth, fifth, and sixth assimilate in colour 

 to the feather at that part, which is white ; the entire of the 

 outer webs of the first five black ; the inner webs with a 

 broad edging of white, to within from one to two inches of 

 the end, which part is black in the first three, but tipped 

 with white in the fourth and fifth ; in the sixth the inner 

 web is white, the outer black, excepting for three or four 

 lines from the tip, where it is white, and again at about an 

 inch from the end where a white spot of an oval form 

 appears. Feathers of the tail white, with black tips.'" 



