BLACK-CROWNED TYRANT 141 
Azara found this species breeding in a hole in a 
bank; and Mr. Dalgleish has described a nest, 
taken from a tree in Uruguay, as a somewhat slight 
structure, four inches in diameter, formed of sticks 
and fibres, lined with fine grass and a few feathers. 
It contained three eggs, pear-shaped, white, with 
large well-defined spots of reddish brown. 
BLACK-CROWNED TYRANT 
Tenioptera coronata 
Above cinereous ; rounded summit of head black, broad front and 
band encircling the black of the head white; wings blackish, upper 
coverts cinereous, edgings of middle and greater coverts and of outer 
secondaries whitish; tail blackish, margins of outer webs of external 
tail feathers white; beneath white; under wing-coverts and a large 
portion of the inner webs of the remiges, except of the two outer 
primaries, white ; bill and feet black ; length 7.8 inches. 
In this species the sexes are alike. The crown is 
black and composed of loose feathers ; the forehead, 
and a broad line over the eye which extends nearly 
round the head, also all the under plumage, pure 
white; neck and back clear grey; quills black. 
This Tyrant is a solitary bird, though often many 
individuals are found within call of each other, and 
they sometimes even unite in a loose flock. It is 
found throughout the Argentine country, ranging 
south to the Rio Negro, in Patagonia, but abounds 
most on the Buenos-Ayrean pampas, where it per- 
forms a partial migration. Most of the Teznioptera 
