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360 BULLETIN 133, UNITED STATES NATIONAL MUSEUM
This handsome gnatcatcher was found in thorny trees at the
border of forest, in semiopen scrub, and lowland thickets or, at the
Estancia Los Yngleses, near Lavalle, Buenos Aires, in groves of
tala {Celtis tola). The birds hopped jauntily about among the
branches with drooping wings and elevated tail, in a manner similar
to other Polioptila^ but the songs and call notes, as loud as those
of a small warbler, were surprisingly strong for a bird of this
group. The ordinary scolding note resembled zhree or pree-ee or
a low chit-it. The usual song, given in a melodious tone, was
whit see wheety wheety wheety or tee tee tee tee wheety wheety
wheety. Occasionally they indulged in a more varied warble. They
were found at times in mixed flocks with other small brush birds.
An adult male taken on October 27, near Lavalle, was in breeding
condition, and an immature female was secured at Lazcano, Febru-
ary 6. The birds were encountered in pairs throughout the year,
and remained attentively near one another at all times. In the
autumn month of April, near Tapia, Tucuman, young males of the
year were in full song and were active and demonstrative toward
the females, so that pairing seemed to be in progress, though the
nesting season was several months in the future. The case is anala-
gous to that of Thr'^yothorus ludovicianus and Sitta caroUnensis,
where young birds pair in their first fall and remain mated through
the winter.
Family MOTACILLIDAE
ANTHUS FURCATUS FURCATUS d'Orbigny and Lafrcsnaye
Anthus furcaius d'ORBioNY and Lafresnaye, Mag. Zool., 1837. cl. 2, p. 27.
(Near Carmen, on the Rio Negro, Patagonia.)^
A series of 16 skins of this pipit afford the following distributional
data: Rio Negro, L^^ruguay, February 21, 1921, immature
male; Baiiado de la India Muerta, 12 miles south of Lazcano, Uruguay,
February 3, three males, two females, adult and immature;
San Vicente, Uruguay, January 31, adult male ; Berazategui, Buenos
Aires, June 29, 1920, female immature; 15 miles south of Cape San
Antonio, Buenos Aires, November 6, adult female; Carhue, Buenos
Aires, December 15 to 17, two adult and one young male, three adult
females; Victorica Pampa, December 26, adult male. In addition
I have examined a male taken September 27, 1919, by E. G. Holt at
Rio Grande, Rio Grande do Sul, Brazil, and two males and two
females shot near Bahia Blanca, Buenos Aires, by S. A. Adams,
from October 31 to November 9, 1903. These records in part somewhat
extend the boundaries of the range assigned by Hellmayr.^^
55 See Hellmayr, El Hornero, vol. 2, Aug. 2, 1921, p. 181.
50 El Hornero, vol. 2, Aug. 2, 1921, pp. 181-182.