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384 BULLETIN 133, UNITED STATES NATIONAL MUSEUM full molt SO that two have lost all of the rectrices. Young birds in Juvenal plumage are similar to females but are streaked with whitish below. A skin in this stage from Mendoza is much browner both above and below than one from eastern Uruguay. The naturalist from North America finds little in the habits and appearance of the shining cowbird that is not reminiscent of Molothrus ater of his native continent. Molothims h. honarien-ns was found in small flocks during the most of the year, the largest bands being noted in fall when at times several hundred flocked together to feed in fields of ripened corn. Bands of from 20 to 50 frequented corrals and plazas at the larger ranches, and became so familiar that they often walked about on dirt floors beneath the porticos of the dwelling houses. At Las Palmas, Chaco, during cold weather a little flock came about the fonda where I had living quar- ters, but when it turned warm and pleasant for a day or two flew off to less sheltered grounds. The birds fed in sociable groups on the ground but at any alarm flew up suddenly to low perches in trees. In pastures and fields these cowbirds gathered about grazing animals and followed along in their company. They treated domestic stock with the greatest familiarity. It was common on cold days to see a little flock whirl into a yard and alight on the back of some horse or ox which paid no attention to their coming. I have seen as many as 15 birds resting on the back of one horse and have no doubt that the warmth of its skin was grateful to its smaller companions who seemed to find especial delight in burying their toes in the hair of its back. Cowbirds were always attracted when grain was fed to horses. They worked over sandy areas by scratching in the usual blackbird fashion by jumping forward and then back, dragging their claws in the dust on the return. In early morning flocks frequently resorted to the open shores of lagoons to bathe. (PI. 20.) The first indication of pairing was noted at the end of October when three, taken on October 29 near Lavalle, Buenos Aires, were all breeding; a female contained an egg nearly ready for the sliell. At this period only small flocks were seen and it was not unusual to find the birds in pairs. At Los Yngleses, the Gibson estate, I was interested one morning in observing the maneuvers of a male cowbird about the newly completed nest of a Sisopygis icterophrys. The female flycatcher was on the nest, as though brooding, though in reality she was merely resting as her home was not yet completed. The cowbird hopped about among the limbs approaching nearer and nearer until the other bird finally darted out at him, though without apparent animosity. The cowbird hopped up then to a point above the nest, peered down into it for a few seconds, after which he flew away apparently satisfied.
U. S. NATIONAL MUSEUM BULLETIN 133 PL. 20 Shining Cowbirds 'Molothrus b. bonariensis' Warming Their Toes ON A Cold Winter Morning. These Birds Alight Fearlessly on Domestic Stock Las Palmas, Chaco, .July 13, 1920 Nest and Eggs of Misto Sicalis a. arvensis) Carhue, Buenos Aire.';, December IS, 1020
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U. S. NATIONAL MUSEUM BULLETIN, 133
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ADVERTISEMENT The scientific public
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IV TABLE OF CONTENTS Annotated list
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Page 415 and 416: BIRDS OF ARGENTINA, PARAGUAY, URUGU
Page 417 and 418: BIRDS OF AKGENTINA, PARAGUAY, URUGU
Page 423 and 424: BIKDS OF ARGENTINA, PARAGUAY, URUGU
Page 445 and 446: BIEDS OF ARGENTINA, PARAGUAY, URUGU
Page 449 and 450: BIEDS OF AEGENTINA, PARAGUAY, URUGU
Page 461 and 462: BIRDS OF AKGENTINA, PARAGUAY, URUGU
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BIEDS OF ARGENTINA, PARAGUAY, URUGU
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INDEX Page a. bivittatus, Lepidocol
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cactorum, Trichopicus INDEX 437 Pag
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INDEX 439 Page Page defllippii, Tri
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INDEX 441 Page immaculata, Phaeopro
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INDEX 443 Page Myospiza humeralis c
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INDEX 445 Page Pseudoseisura guttur
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INDEX 447 Page Sublegatus fasciatus
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SMITHSONIAN INSTfTUTION LIBRARIES 3
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