202 
Barrows on Birds of the Lovjer Uruguay. 
[October 
middle of September and leaving soon after the first of April. 
The nest is built the last of November or first of December. 
It is usually made of twigs, grass, etc., and there is almost 
always some attempt at concealment, made b}^ the addition of 
bits of bark and moss to the outside. One found December i, 
1879, was built on the horizontal stalk of a half dead cactus 
( Opuntia ) which stood in an open, sandy field at a distance from 
any trees. It was remarkably shallow and the two eggs which 
it contained were exact miniatures of heavily spotted eggs of the 
Common Tern (Sterna hirundo) . Other nests, though better 
sheltered than this one, were always in comparatively exposed 
situations, on the horizontal limbs of trees and seldom more than 
four or five feet from the ground, yet they were not easy to find, 
even after the parents had shown by their anxiety that they could 
not be many yards away. I never started the male from the 
eggs, but always the female. 
71 . Myiarchus tyr annulus (Mull.). — First seen November 
20, 1880; afterwards occasionally and in pairs until the first 
week in January, 1881, when I left Concepcion. On December 
28, I found a loose nest of hair, feathers, etc., in a hollow stub 
five feet from the ground. It contained three eggs which in 
color and markings were precisely like those of M. crinitus , but 
a little smaller. 
72. Tyrannus melancholicus Vieill. — This wanderer is 
not an uncommon summer resident at Concepcion where I found 
a straggling party of a dozen or more November 1, 1879. De- 
cember 20, 1880, a nest with three eggs was taken from a slender 
bush which stretched out over one of the narrow river channels 
between the islands. The nest was compactly built of twigs, 
grass, and roots, and would easily have passed for an average nest 
of the Kingbird (Tyrannus carolineiisis} . The eggs were 
white, sparsely splashed with several shades of brown. 
73. Tyrannus aurantio-atro-cristatus Lafr. et d’ Orb . — 
A not very abundant summer resident, but one not easily over- 
looked, owing to its habit of perching on the topmost twig of 
any tree on which it alights, making forays from time to time 
when tempted by its winged prey. A nest found December 28, 
was a rather careless structure of twigs and roots placed among 
the thickest branchlets of a mimosa at a height of about eight 
feet. It contained two eggs (besides one of the Cowbird). 
