Audouin's Gull. 



495 



midfUe of tlic lower abdomen whitish ; under tail-coverts 

 white, a little huffish, Avith two blackish-brown transverse 

 bands, sometimes not wholly regular but always very well 

 marked ; primary-quills quite black, with paler inner webs 

 and whitish tips to most of them ; secondaries dark umber, 

 tipped with huffish grey; central tail-feathers marbled or 

 barred with blackish on a whitish ground-colour at the base, 

 then dull dark brown, and finally tipped with dirty white ; 

 outermost tail-feather white, the following outside and 

 the two middle feathers white barred with dark brown at the 

 base, dark brown towards the tip, finally tipped with dirty 

 white ; under wing-coverts and axillaries smoky brown, 

 the latter indistinctly marbled with dull grey ; feet greyisii 

 brown. 



Bill from the forehead 1*9 inch ; wing 15"5 inches. 



Head of Larus auduuini. 



Audouin's Gull (Larus audouini), youngi male in its first 

 dress, but able to fly. — Island of Vacca (S.W. Sardinia), 

 July 12, 1901. P. Bonomi [C.]. 



Bill blackish, overspread with reddish at the base and 

 near the apex of the culmen, horn-coloured at the end : iris 

 very dark hazel; the colour of the head and neck of a 

 light whitish grey, with the edges of the feathers sufl'used 



