Audouin's Gull. 497 



end of the bill a little arclied, the base of the culmen on tlie 

 upper side a little convex ; the angle of the gonys rather 

 distinct; the nostrils elongated, somewhat oval, and broad 

 (see fig. 13, p. 494). 



Tail-feathers white at the base, with some blackish trans- 

 verse bars (except the outermost one and sometimes that 

 which follows) ; outermost tail-feather white at the end, the 

 basal three-fourths of the second and third outside feathers 

 and half the others white, all banded with blackish ; these 

 bands sometimes not regular and always scanty in the second 

 and third, more abundant in the following and in the central, 

 all having a subterminal blackish band and with dirty white 

 tips. 



Audouin's Gull, young, in the first dress. 



Bill thinner and more elongated in proportion, with the 

 rami of the lower mandible decidedly arched, the space 

 between the gonys and the end of the bill longer and much 

 more arched, the base of the culmen on the upper side more 

 flat ; the angle of the gonys clearly distinct ; the nostrils 

 straight, linear, and narrower (see fig. 13, p. 495) . 



Tail-feathers pearly grey-white at the base, without any- 

 blackish transverse band, the light pattern more extended 

 on the inner webs of the feathers. They are pearly grey- 

 white for about one-fourth of their length, the light 

 pattern increasing in extent for three-fourths of the total 

 length on the inner webs of all of them except the two 

 central (which are black, except at the base) ; in the rest 

 they are blackish, tipped with dirty white, and with the 

 outermost one edged with white. 



In concluding this note I give a list of the specimens 

 in my Collection : — 



a. d ad. Island of Elba, August 26, 1883.— ^o.- Coll. Roster. 



liill from forehead * TO inch, coral-red, with a subapical 

 blackish band ; wing 16"G iuches. 



* I always measure the bill from the feathered space dowii the 

 forehead to the tip, and I observe that this space is very much prolonged 

 on the base of the bill, so that it appears shorter than it is. 



