Audouin's Gull. 495 
middle of the lower abdomen whitish ; under tail-coverts 
white, a little huffish, with 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 iiidistinctly marbled with dull grey; feet greyish 
brown. 
Bill from the forehead 1*9 inch ; wing 15"5 inches. 
Fig. 13. 
Head of Larus audouini. 
Audouin's Gull (Larus audouini), young 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 suffused 
