OENITHOLOGICAL EXPLORATIONS. 



1 



extent than on the first primary. In the third the wedge occupies still 

 more of the inner web and reaches the posterior border of the mirror 

 which is larger than on the foregoing and of a difl'erent shape, still 

 without reaching the shaft or the outer web, however.* The fourth is 

 essentially similar, and in the fifth a gray wedge occupies most of the 

 outer web too, thus reducing the black to a subai)ical cross band, pre- 



FiG. 5.— First three primaries of Larus marinus. 



cisely as in a specimen of L. marinus now before me. None of the fore- 

 goiug (1-4) i^rimaries have any distinct gray on the outer web. 



This species is so jiuzzliugly intermediate between L. marimis and 

 cacMnnans that it is difficult to say to which of these it is most closely 

 allied, but on the whole I am inclined to look upon it as nearer to the 

 former, with which it is placed at first sight on account of the darkness 

 of the mantle, which in the live bird appears to be wholly black. 



Not well represented in the drawing, Fig. 4. 



