214 LARID.E. 
This species is easily distinguished by the absence of a claw 
on the hind toe, which is merely a small tubercle. 
Total length about 15 inches. 
313. Lakus audouini, Payr. Audouin's Gull. 
This Gull is recorded by Natterer as having been once ob- 
tained near Tarifa. 
Lord Lilford, who discovered it breeding in 1874 off the 
south of Sardinia on a rocky island, kindly gave me the fol- 
lowing notes as to the colours of the soft parts, which marks 
will serve to distinguish the species. 
" Feet and legs very dark grey, claws black. Bill brilliant 
coral-red, with one broad black band. Iris brilliant hazel, pupil 
black. Inside of mouth pale flesh-colour. Eyelids coral-red." 
The following are the measurements (in inches) of a pair, 
taken from the dried skins : — 
6 2 
Bill from gape 3-00 2-80 
Wing, carpus to tip 16'75 15-75 
Tarsus 2-45 2-30 
Tail 6-00 6-00 
The total length is about 20 inches. 
313. Lakus canus, Linn. The Common Gull. 
This Gull is not mentioned by Favier, but is during some 
winters not uncommon in the Straits of Gibraltar. 
Legs dark, nearly black in the adult, brownish in the young. 
Total length about 18 inches; Aving, carpus to tip 14*5; 
tarsus 1*9. 
314. Lakus akgentatus, Briinn. The Herring-Gull. 
The Herring Gull is stated by Favier to be " as common 
near Tangier during winter as L. ridibundus, arriving in 
August, September, and October, and returning north in 
March, April, and May.'^ 
This bird and the Lesser Black-backed Gull feed in large 
numbers on the refuse from the slaughterhouses at Gibraltar ; 
and it is not uncommon to see three or four hundred of them 
together there. 
