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Bulletin - United States National Museum - si-pddr - Smithsonian ...

Bulletin - United States National Museum - si-pddr - Smithsonian ... Bulletin - United States National Museum - si-pddr - Smithsonian ...

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352 BULLETIN 133, UNITED STATES NATIONAL MUSEUM MIMUS SATURNINUS MODULATOR (Gould) Orpheus modulator Gould, Proc. Zool. Soe. London, 1836, p. 6. (Mouth of Rio de la Plata, Montevideo, and Maldonado, Uruguay.)*^ Six skins preserved include a pair from Lavalle, Buenos Aires, shot November 13, 1920; a pair from San Vicente, Uru

BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 353 MIMUS PATAGONICUS PATAGONICUS (d'Orbigmy and Lafresnaye) Orpheus patagonicus d'OEBiGNY and Lafresnaye, Mag. Zool., 1837, cl. 2, p. 19. (Patagonia.) Two males and a female of the Patagonian mocking bird, in slightly worn breeding dress, secured at General Roca, Rio Negro, November 24 and 29, 1920, show the normal development of grayishbrown ventral surface and cinnamon-buff flanks that characterize the species. One when first killed bad the bill and tarsus black; iris buffy brown. This mocker was common in growths of atriplex {Atriplex lampa and A. crenatifoNa) , creosote bush, and greasewoods on the flood plain of the Rio Negro, near General Roca, and proved to be a true desert form since it spread out through the arid, gravel hills north of the railroad, where water was wholly lacking. On December 6 it was recorded from the train near Challaco, Neuquen (approxi- mately 100 kilometers west of the town of Neuquen), but was not found at Zapala. These mockers watched alertly from the tops of bushes, or flew ahead of me, showing a band of white, interrupted in the middle, at the end of the tail. Their song, mockerli^'e in type, delivered from some low perch, consisting of many broken phrases interspersed with frequent imitations of the notes of other brush birds, was similar to that of 31. triianis, though the performers were less flamboyant in actions during delivery. MIMUS PATAGONICUS TRICOSUS Wetmore and Peters Mimus patagonicus tricosns Wetmore and Peters, Proc. Biol. Soc. Wash- ington, vol. 36, May 1, 1923, p. 145. (Lujan de Cuyo, Province of Mendoza, Mendoza.) The present form is separated from typical patagonicus by its grayer dorsal surface, a difference most evident in birds in fall and winter plumage. Two were observed near an old puesto above the city of Mendoza, on March 15; and in the foothills of the Andes near Potrerillos, Mendoza, the birds were common from March 15 to 19. An immature male, taken at El Salto, at an elevation of 1,800 meters, on March 19, is in post -juvenal molt. MIMUS THENCA (Molina) Turdus Thenca Molina, Sagg. Stor. Nat. Chili, 1782, p. 250. (Chile.) Near Concon, Chile, M. thenca Vv'as common from April 24 to 28, 1921, and two specimens were taken. This species seems closely allied to M. longicaudatus Tschudi ** of Peru, which may prove sub- "Arch. fur Naturg., 1844, p. 280. (Peru.)

352 BULLETIN 133, UNITED STATES NATIONAL MUSEUM<br />

MIMUS SATURNINUS MODULATOR (Gould)<br />

Orpheus modulator Gould, Proc. Zool. Soe. London, 1836, p. 6. (Mouth of<br />

Rio de la Plata, Montevideo, and Maldonado, Uruguay.)*^<br />

Six skins preserved include a pair from Lavalle, Buenos Aires, shot<br />

November 13, 1920; a pair from San Vicente, Uru

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