Cape San Antonio, Buenos Ayres. 163 
has reminded me of a lot of fox-terriers in full chase, yelping 
and snapping. 
Breeding-Notes.—The one or two nests I have taken were 
on the respective dates of 21st August and 18th October 
(the latter much incubated). In the former case the bird sat 
very close. Generally the birds both remain at a distance, 
agitating their wings, crouching down on the ground, and 
constantly uttering their cry. The nest is placed on marshy 
ground, or at the edge of water, and consists merely of a bed 
of roots and decayed grass, just high enough to keep the eggs 
dry. These are four in number, and very like those of V. 
cayennensis—so like as to be almost undistinguishable. The 
eround-colour is rather richer and darker, and the black 
blotches larger in my specimens ; but it would be necessary 
to have a large series in order to be sure that this difference 
is really always existent. They average 133 x 110. 
53. AUGIALITIS FALKLANDICA. 
Common, except in times of drought. It affects the borders 
of marshes and lagoons, and with the cinnamon-coloured 
patch on the back of its head, and the black-barred breast, 
is a very noticeable and handsome little bird. - 
Breeding-Notes.—The latter half of August and beginning 
of September constitute the breeding-season. Four nests 
which I have taken were situated close to swamps, and were 
only a hollow scraped in the ground, and more or less lined 
with dry grass. On one occasion the sitting bird remained 
at a little distance watching me; but the other times it only 
left the nest when I was a yard from it, and hobbled away 
with both wings drooping as if broken, in the most natural 
manner possible. The full clutch is three (two of the four 
nests having that number). They are pointed in shape, of 
an olive ground-colour, with black spots (similar to the Lap- 
wing’s, in short), and average 113 x 144. 
54. Larus pominicanus, Licht. 
55. LAaRUS MACULIPENNIS, Licht. 
56. Larus cCIRRHOCEPHALUS, Vieill. 
My notes on the above three species, all of which are com- 
