CHOCOLATE TYRANT 137 
vanishes altogether—its long wings being as sharply 
pointed as those of the Peregrine Falcon, while 
its motions in the air have a Gull-like grace and 
buoyancy. 
It is a very pretty bird; the upper plumage is 
grey tinged with rufous, the throat pure dark grey, 
breast and belly rufous, wing-coverts light silvery 
grey, remiges and rectrices dark. Azara classed it 
under the name of Pepoaza (banded-wing) with 
the Teniopterz, to which it comes very near in 
form, flight, language, and habits, though it has 
longer legs and runs more on the ground. Its summer 
home is in Southern Patagonia, but its breeding- 
habits are not known; in winter it migrates north, 
and in May is found scattered over the pampas, 
where it is usually called by the country people 
Chorlo, a name for all Plovers; for while running 
swiftly about on the ground, often associating with 
flocks of Plover, it has a certain resemblance to 
them. From the hue of its plumage it is also 
called El Chocolate, a name I have thought it best 
to preserve. 
These birds are very sociable, going in small flocks, 
usually of from half a dozen to twenty individuals ; 
they are restless and active, and quick and graceful 
in all their movements, and seek their food on the 
ground, chiefly coleopterous insects, on the great 
level plains they inhabit. While on the wing they 
pursue each other playfully in the air, and also attack 
and chase passing birds of other kinds, apparently 
in a sportive spirit. Occasionally they perch on a 
