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326 BULLETIN 133, UNITED STATES NATIONAL MUSEUM
currence and appeared to gather in little scattered colonies, as many
extensive areas of suitable growth were not inhabited by them.
They were sh}'^ and apprehensive, so that it was often difficult to
approach them. Their custom was to clamber about among the rush
stalks, where their long legs fitted them for progress, or occasionally
to fly across little openings with slightly tilting, but direct flight,
performed with head erect and rapidly flitting wings. The white
in wing and tail are prominent in flight. Occasionally they de-
scended to run about on little mud bars at the bases of clumps of
cat-tails.
They were first recorded at Dolores, Buenos Aires, on October
21, 1920, when two were seen. Near Lavalle, in the same Province,
they were found casually on October 30, November 2 and 9, but were
not common. On March 26, and 28, 1921, a number were recorded
near Tunuyan, Mendoza, in the rush-grown marshes known as
cienagas. They were found here in little family parties, and, though
shy, were tolled out by squeaking from concealment among the cattails.
Near Concon, Chile, April 28, one was seen, and on the day
following one was brought by a boy as, in company with Dr.
E. P. Keed, I was about to leave for Valparaiso.
LEPTOPOGON AMAUROCEPHALUS Cabanis
Leptopogon amaurocephalus Cabanis, Arch. Naturg., vol. 1, 1847, p. 251.
(Brazil.)
On July 21, 1920, at Las Palmas, Chaco, an adult female Leptofogon
was killed in dense brush near the Rio Quia. The bird
hopped about actively under cover of the branches, or paused to
rest for considerable intervals on hidden perches. In this specimen,
when first taken, the extreme base of the mandible was tilleul buif
rest of bill black; iris natal brown; tarsus and toes fuscous.
With only three specimens of L. amaurocephalus at hand, I do
not care to express an opinion as to the forms into which this
species may be divided. The specimen from Las Palmas, which
has the wing 65.2 mm. long, is slightly deeper and richer in color
throughout than a skin from Victorica, Sao Paulo, or the type of
icastus Oberholser ^^ from Sapucay, Paraguay. Chubb " has indicated
that specimens from Sapucay do not differ from others from
Brazil.
CAMPTOSTOMA OBSOLETUM OBSOLETUM (Temminck)
Muscwapa ohsoleta Temminck, Nouv. Roc. Planch. Col. Oiseaux, vol. 3,.
1838, pi. 275, fig. 1. (Curytiba, Parana, Brazil.")
Five males, one shot at Eesistencia, Chaco, July 8, 1920, one from
Laguna Wall, 200 kilometers west of Puerto Pinasco, Paraguay,
i-Proc. Biol. Soc. Washington, vol. 14, Dec. 12, 1901, p. 187.
'"Ibis, 1910, p. 582.
i» Nov. Zool., vol. 15, June, 1908, p. 43.
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