496 Count E. Arrigoni Degli Oddi on 
■with buff; the back with a brownish appearance, but the 
end of the feathers huffish ; the wings and lower back like 
those of the Yellow-legged Herring-Gull^ but the edges 
broader, and the huffish tint lighter and not overspread 
with grey, but with whitish yellow ; chin and throat huffish 
white ; under-parts greyish, with the feathers edged with 
buffi?h, the grey tint overspread with brownish, more distinct 
on the sides of the breast and of the upper abdomen ; lower 
abdomen, vent, under tail-coverts, and the sides snow-white, 
some of the lateral under tail -coverts shewing a dark greyish 
spot towards the end of the feathers on the outer web ; tail- 
feathers blackish, with a broad terminal band and an edge 
of light huffish white, the base of a delicate pearly white, 
the light pattern more extended on the inner webs of the 
outside feathers ; feet dark dirty plumbeous. 
Bill from forehead 1*67 inch ; wing 13 5 inches. 
A young male of the same age, date, and locality has 
the greyish on the head and upper- parts darker, and also 
the dark tint on the under-parts, so that the contrast with 
the snow-white of the belly is more evident. 
Bill from forehead 1'6 inch ; wing 12*4 inches. 
Two other females from the same locality and with the 
same date are younger and not fully grown ; they resemble 
the above-mentioned young males, but there are some grey 
downy tracts on the neck and on the sides of the head. 
Bill from forehead 1'6 inch; wing 10*7 inches. 
Besides the small size and the dimensions of the bill and 
wing, the differently coloured bill, the darker and more 
uniform pattern of the plumage, the snow-white abdomen 
and vent, we must call attention to the very different pattern 
of the tail-feathers and the shape of the bill, which enable us 
to recognise this species at once in its first dress after the 
downy nestling-period. 
Yellow-legged Herring- Gull, youngs in the first dress. 
Bill stouter and larger, with the rami of the lower mandible 
straight or a little arched, the space from the gonys to the 
