Bulletin - United States National Museum - si-pddr - Smithsonian ...
Bulletin - United States National Museum - si-pddr - Smithsonian ... Bulletin - United States National Museum - si-pddr - Smithsonian ...
350 BULLETIN 133, UNITED STATES NATIONAL MUSEUM countered in growths of heavy weeds along irrigation ditches, in small marshes, or in corn fields, where they sang and chattered or worked quietly about. At this season it was easy to draw them into sight, as at a squeak they came clambering and hopping out through the dense growth that sheltered them until often they were scarcely a meter away. All were in molt into first fall plumage. Several of those secured were badly infested about the anus with larvae of a parasitic fly, which, however, seemed to cause them no incon- venience. An adult male, when fresh, had the maxilla dull black; base of mandible vinaceous buff, with the tip washed with quaker drab; iris natal brown ; tarsus and toes wood brown ; claws fuscous. Family MIMIDAE MIMUS TRIURUS (Vieillot) Turdus triurus Vieillot, Nouv. Diet. Hist. Nat., vol. 20, 1818, p. 275. (Paraguay.) In the series of 11 skins preserved there seems to be no constant difference between specimens from northern Patagonia, Pampa, Mendoza, and Paraguay. The banded mocking bird was collected and observed as follows: Santa Fe, Santa Fe, July 4, 1920; Resistencia, Chaco, July 10; Las Palmas, Chaco, July 13 to August 1 (male July 15, female July 27) ; Riacho Pilaga, Formosa, August 13 to 21 (female August 18) ; Formosa, Formosa, August 23 and 24; Puerto Pinasco, Paraguay, September 3; Kilometer 80, west of Puerto Pinasco, September 6 to 20 (males September 7 and 15) ; Kilometer 110, September 23, and Kilometer 200, September 25 (west of the same point) ; General Roca, Rio Negro, November 23 to December 3 (female November 24) ; Carhue, Buenos Aires, December 19; Vic- torica, Pampa, December 23 to 29 (adult male and two females December 26, immature male, December 29) ; Tunuyan, Mendoza, March 24 and 27, April 12. 1921 (immature female, March 27) Birds taken at the end of December were in much worn plumage. A young male in juvenal plumage, taken December 29, has the breast obscurely mottled with grayish brown, but is otherwise similar to adults. An immature female, shot March 27, has not quite completed the post-Juvenal molt, and in fresh plumage is darker and ; Tapia, Tucuman, richer in color than others examined. Some skins from Victorica, Pampa, and the one from Mendoza, have the bill slightly heavier than in specimens seen from more eastern localities. In general appearance and habits the banded mocker is similar to Mimus folyglottos. It inhabits dense growths of low brush, though
BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 351 attracted frequently about farmhouses or courtyards. It was common in the Chaco, was less numerous on the pampas because of lack of suitable coverts, and Avas found in fair numbers on the Kio Negi'o of Patagonia, where it finds its southern limit. It reached its greatest abundance in the dry, thorny scrubs of the Pampa Central, where, near Victorica, it was one of the common birds. It appears to be sedentary in habits, and individuals may be observed in the same vicinity day after day perched above some dense tangle of brush. During winter it indulged in occasional snatches of song, but wuth the coming of spring gave utterance to the melody that caused such pleasure and admiration in Hudson and occasioned his eulogy of its vocal powers. The song strongly resembles that of Mimus polyglottos^ and is accompanied frequently by aerial gyrations, in which the birds spring into the air and support themselves with sIoav beats of the widely opened wings, that, with the spread tail, display their contrasted markings to the utmost. They are excellent mimics, a frequent imitation being that of the low chur-r-r-ri of the vermilion flycatcher. In ordinary flight the extensive white markings of the tail, with a flash of white in the wings, are prominent characteristics, while in proper light the brown coloration of the back may be dis- tinguished. The Anguete Indians called this species pihn mukh. A nest found December 26 near Victorica, Pampa, was placed 2 meters from the ground in a small shrub near the center of an open thicket. The structure was composed of thorny branches, lined with various soft materials, while a bulwark of coarse, very spiny twigs, erected to a height of 50 mm., protected the rim on all sides. The nest contained six eggs, heavily incubated, of which one is that of Molothrus honariensis. Four of the others, unquestionably those of Alimus tnu7'us, are pale Niagara green, spotted throughout Avith a color varying from Avalnut to Rood's browm, varied with occasional markings of dull lavender. The spots are most numerous at the larger end. These four measure: 26.2 by 18.3; 25.7 by 18.6; 25.5 by 18.2; and 25.2 by 18.7 mm. The sixth egg has the background dull white, with a faint greenish tinge, and is blotched boldly with hazel and chestnut brown, with a few markings of light plumbago gray. It is distinctly different in type from the four described above but may be an aberrant ^gg of fnurus. It measures 24.6 by 19.1 mm. Young mockers, seen at the end of December, rested quietly on open shaded perches, but hopped alertly to cover among heavy branches when at all alarmed.
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350 BULLETIN 133, UNITED STATES NATIONAL MUSEUM<br />
countered in growths of heavy weeds along irrigation ditches, in<br />
small marshes, or in corn fields, where they sang and chattered or<br />
worked quietly about. At this season it was easy to draw them into<br />
<strong>si</strong>ght, as at a squeak they came clambering and hopping out through<br />
the dense growth that sheltered them until often they were scarcely<br />
a meter away. All were in molt into first fall plumage. Several<br />
of those secured were badly infested about the anus with larvae of<br />
a para<strong>si</strong>tic fly, which, however, seemed to cause them no incon-<br />
venience.<br />
An adult male, when fresh, had the maxilla dull black; base of<br />
mandible vinaceous buff, with the tip washed with quaker drab;<br />
iris natal brown ; tarsus and toes wood brown ; claws fuscous.<br />
Family MIMIDAE<br />
MIMUS TRIURUS (Vieillot)<br />
Turdus triurus Vieillot, Nouv. Diet. Hist. Nat., vol. 20, 1818, p. 275.<br />
(Paraguay.)<br />
In the series of 11 skins preserved there seems to be no constant difference<br />
between specimens from northern Patagonia, Pampa, Mendoza,<br />
and Paraguay. The banded mocking bird was collected and<br />
observed as follows: Santa Fe, Santa Fe, July 4, 1920; Re<strong>si</strong>stencia,<br />
Chaco, July 10; Las Palmas, Chaco, July 13 to August 1 (male July<br />
15, female July 27)<br />
; Riacho Pilaga, Formosa, August 13 to 21<br />
(female August 18) ; Formosa, Formosa, August 23 and 24; Puerto<br />
Pinasco, Paraguay, September 3; Kilometer 80, west of Puerto<br />
Pinasco, September 6 to 20 (males September 7 and 15)<br />
; Kilometer<br />
110, September 23, and Kilometer 200, September 25 (west of the<br />
same point) ; General Roca, Rio Negro, November 23 to December<br />
3 (female November 24)<br />
; Carhue, Buenos Aires, December 19; Vic-<br />
torica, Pampa, December 23 to 29 (adult male and two females December<br />
26, immature male, December 29) ; Tunuyan, Mendoza, March<br />
24 and 27,<br />
April 12.<br />
1921 (immature female, March 27)<br />
Birds taken at the end of December were in much worn plumage.<br />
A young male in juvenal plumage, taken December 29, has the<br />
breast obscurely mottled with grayish brown, but is otherwise <strong>si</strong>milar<br />
to adults. An immature female, shot March 27, has not quite completed<br />
the post-Juvenal molt, and in fresh plumage is darker and<br />
; Tapia, Tucuman,<br />
richer in color than others examined. Some skins from Victorica,<br />
Pampa, and the one from Mendoza, have the bill slightly heavier<br />
than in specimens seen from more eastern localities.<br />
In general appearance and habits the banded mocker is <strong>si</strong>milar to<br />
Mimus folyglottos. It inhabits dense growths of low brush, though