202 Barrows on Birds of the Louver 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 by the addition of 

 bits of bark and moss to the outside. One found December:, 

 1879, w^as built on the horizontal stalk of a half dead cactus 

 {Opzmtia) 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 tyrannulus {Mull.). — First seen November 

 30, 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. 



73. 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 i, 1879. De- 

 cember 30, 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 ( TyranJtus carolinensis) . The eggs were 

 white, sparsely splashed with several shades of brown. 



73. Tyrannus aurantio-atro-cristatus Za/r. el 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 38, 

 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), 



