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356 BULLETIN 133, UNITED STATES NATIONAL MUSEUM
a low tree. The song period began, in Paraguay, the first of October,
and extended to the time of molt in February. Their usual call note
was a low pup pup varied with several louder, laughing calls that
were heard especially toward dusk. On a fall evening in April,
as J. L. Peters and I descended a trail on the slopes of the Sierra
San Xavier, in Tucuman, robins called and answered on every side
from the heavily forested slopes. In spite of their retiring habits
the birds were curious, so that it was easy to call them out and shoot
what specimens were wanted. On several occasions they were
observed feeding on wild fruits, once (at E,esistencia, Chaco) on
the berries of Rapanea laetevirens. The species is one that is hunted
to some extent and will need protection to maintain it in its pres-
ent abundance.
A nest, found October 30 (at Los Yngleses), was placed in a tala
tree 4 feet from the ground, where several small shoots projecting
from the side of the trunk (which was 12 inches in diameter) furnished
a firm support. The nest was made of the dried stalks of
weeds mixed with a small quantity of fresh green material, and was
lined with rootlets. A rim made of cow dung ran part around, but
there was no complete cup of such material. This nest contained
three eggs of the thrush, and three of those of the common cowbird
{Molothrus h. honariends) . The thrushes' eggs have the ground
color much paler than pale Niagara green, blotched and spotted with
brick red and chestnut brown. Two of the eggs are boldly marked
over the entire surface. The other has small, scattered spots
throughout, with heavy markings at the larger pole. These eggs
measure 28.7 by 21.4; 28.7 by 4; and 28.5 by 20.9 mm. Another nest,
examined November 10, that contained one egg, had a solid cup of
hardened earth that contained the nest lining.
TURDUS MAGELLANICUS PEMBERTONI Wetmore
Turdus magellanicus pem'bertoni Wetmore, Univ. Califoruia Publ. Zool.,
vol. 21, no. 12, June 16, 1923, p. 335. (Cerro Anecon Grande, Rio
Negro, Argentina.)
The present form is distinguished from T. m. magellanicus by
grayer coloration both above and below, .a distinction easily evident
when series are compared. Hellmayr'*^ considers magellanicus as
subspecifically allied to T. falcMandii from the Falkland Islands,
but, though the two are evidently of the same stock, difference between
them, in my opinion, is sufficiently great to warrant their
specific separation.
This bird, which might with propriety be known as the willow
robin, was fairly common in the groves of large willows bordering
«Nov. Zool., vol. 28, September, 1921, p. 238.